AudioCircle
Audio/Video Gear and Systems => Cheap and Cheerful HiFi => Topic started by: wushuliu on 25 Sep 2017, 07:28 pm
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Time and technology marches on. For the low power TPA311X lovers out there who are looking for step up in sound quality or for those who need more power before jumping on board, the newer TPA32XX boards are now easily available. I've been using a TPA3251D2 (140W) from 3eaudio
(http://www.audiocircle.com/image.php?id=168977)
http://www.3e-audio.com/amplifier/tpa3251-2ch-140w/
http://www.ebay.com/itm/TPA3251-2x140-Watt-1-THD-N-Class-D-Audio-Amplifier-/332371653319?hash=item4d62e4f2c7:g:LHEAAOSwlY1ZNqix
The TPA3251 is optimized for 4ohms, TPA3255 for 8ohms.
Texas Instruments themselves appear to now be competing aggressively with the diy market. They have now offered a 50% discount on their evaluation boards if you register with them and use code 'highpoweraudio' on checkout.
How do they sound? Compared to the very tricked out, wonderfully made Wiener Mono TPA3118 boards I had, the TPA3251 to me is even quieter and even better low level detail and overall realism. This amp has been one of the most rewarding purchases of the past few years. I haven't even modded the damn thing! No desire to. Toss those YJ boards and get one of these.
Is there a catch? Yes, in that TPA311X prices have dropped so low you can get them for just a few bucks now. And being low power the power supply needs are more flexible. The higher power TPAs will cost you around a whopping $90+ (less if you get the TI discount). Of course that's nothing in audio terms, but the power supply will also cost about the same depending. I use a Connexelectonic SMPS that cost about $85. So total cost will be in the <$200 range. Not bad for for the watts you get and the sound quality. Gorgeous sound quality.
I can't recommend these enough. Crazy to think how far Class D has come in 10 years.
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Crazy to think how far Class D has come in 10 years.
I was thinking the same thing the other day
Long story short, a TPA-3116 displaced a very highly regarded SET in my system. As nice as the SET was, it wasn't up to the task of dealing with the difficult load the Spatial M3ts presents. The 3116 performed much better. In fact the person who bought my SET was flat out astonished how good the cheap TI board sounded with the Spatial OBs.
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There's a thread at diyaudio on the ti eval units.
Looks interesting, but the 3255's are oos :(
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There's a thread at diyaudio on the ti eval units.
Looks interesting, but the 3255's are oos :(
Out of stock at TI, But 3e-audio have them in stock. They cost $25 more than the TI's discounted boards, but I think they look nicer and they a little measure better than the TI. Very nice boards, real solid feel to them.
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Out of stock at TI, But 3e-audio have them in stock. They cost $25 more than the TI's discounted boards, but I think they look nicer and they a little measure better than the TI. Very nice boards, real solid feel to them.
Curious what op amps 3e is using? In the ti board, it uses op amps to generate a balanced signal to the amp chip from a single ended input.
Since my dac is single ended, would be using the op amp.
Randy
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Curious what op amps 3e is using? In the ti board, it uses op amps to generate a balanced signal to the amp chip from a single ended input.
Since my dac is single ended, would be using the op amp.
Randy
JRC4580
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The TI eval board for the 3255 allows for a single channel output of around 600A. I thought it could make a good sub amp. The 3e-audio board doesn't seem to have that ability.
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The TI eval board for the 3255 allows for a single channel output of around 600A. I thought it could make a good sub amp. The 3e-audio board doesn't seem to have that ability.
Yes, the 3e-audio are for 2 channel only. IIRC the TPA32XX do not perform as optimally in mono. Not to mention it would be kind of a waste to use amps that sound this good just for subs. Plenty of other options for that.
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The TI eval board for the 3255 allows for a single channel output of around 600A.
600A (amps) would be enough to completely melt the driver and anything in it's vicinity! 600W is the max 2Ω mono output. Of course, that figure is with 10% THD+N, which is fairly high even for a subwoofer application, and 480W is the mono 2Ω output at 1% THD+N.
wushuliu, I see you're using an SMPS with your TI module. I've noticed that with manufactured Class D amps including the Class D manufacturers on this forum, the field seems to be split between SMPS and Linear supplies, and the linear supplied amps actually seem to be more prevalent among the smaller boutique manufacturers.
I'm sure you've experimented quite a bit with both and have you come to a definitive preference or has it varied with each Class D module?
Steve
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600A (amps) would be enough to completely melt the driver and anything in it's vicinity! 600W is the max 2Ω mono output. Of course, that figure is with 10% THD+N, which is fairly high even for a subwoofer application, and 480W is the mono 2Ω output at 1% THD+N.
wushuliu, I see you're using an SMPS with your TI module. I've noticed that with manufactured Class D amps including the Class D manufacturers on this forum, the field seems to be split between SMPS and Linear supplies, and the linear supplied amps actually seem to be more prevalent among the smaller boutique manufacturers.
I'm sure you've experimented quite a bit with both and have you come to a definitive preference or has it varied with each Class D module?
Steve
Hi Steve, it's been a while since I've used a linear PS for a higher power amp. Not since the Classdaudio days. Back then I was impressed with the Connex SMPS, but IIRC the linear allowed more low end oomph if you went big enough. Convenience wins this time around - a massive toroid and a huge cap bank (and enclosure, etc etc.) just seems like a chore. The Connex sounds wonderful. No drawbacks come to mind. No edginess or this or that. A beefy linear is probably better, but as is it sounds too good to care. First amp set up I have left alone maybe ever.
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Hi wushului, How would rate this amplifier compared to a Classdaudio SDS254?
I see that 3eaudio also have a SMPS.
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An actual heatsink!
Thanks wushuliu :thumb:
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Hi wushului, How would rate this amplifier compared to a Classdaudio SDS254?
I see that 3eaudio also have a SMPS.
Been a while since the CDA but this should definitely be an upgrade. Certainly these have lower distortion and noise iirc. It's another league imo.
@johnr. Lol. Big one. Barely gets warm.
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Are these available in a ready made amp? I love DIY audio and enjoy building, but have almost zero free time these days......well a few hours to do crap like post on forums, but not enough to source component and build an amp I have a lepai 2020A powering my Merlin monitors in my computer monitor setup. Clearly an amp upgrade would help. Lepai is a decent dirt cheap little amp and I'm impressed it can even power these speakers. but it makes me want more. (decided upgraded PS not worth time or money)
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Are these available in a ready made amp? I love DIY audio and enjoy building, but have almost zero free time these days......well a few hours to do crap like post on forums, but not enough to source component and build an amp I have a lepai 2020A powering my Merlin monitors in my computer monitor setup. Clearly an amp upgrade would help. Lepai is a decent dirt cheap little amp and I'm impressed it can even power these speakers. but it makes me want more. (decided upgraded PS not worth time or money)
No ready made amps I'm aware of. 3eaudio sells their own SMPS and they provide wiring and connectors for the boards so all you'd need to worry about is the mounting/enclosure part.
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Here is an image from the 3e audio website showing the power supply connected w/ an umbilical cord to the TPA3255 amp board http://www.3e-audio.com/amplifier/tpa3255-2ch-260w/
So are all the connectors provided w/ the amp board & power supply? (3e audio website & their ebay listings do not specify or show separate accessories). With that short umbilical cord, I assume both boards should fit in the same enclosure, or no (maybe make longer umbilical cord if needed)? Any good enclosure recommendations? (found some single board clear plastic ones on fleabay, but curious of better options). Thanks wushuliu!
(http://www.audiocircle.com/image.php?id=169063)
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So are all the connectors provided w/ the amp board & power supply? (3e audio website & their ebay listings do not specify or show separate accessories).
A full set of connectors and wire tails are supplied with the amplifier board. With the power supply comes a longer umbilical than shown, and an AC connector with wire tails.
There is a large variety of chassis/enclosures available from either ebay or AliExpress (https://www.aliexpress.com/af/amplifier-chassis.html?SearchText=amplifier+chassis<ype=wholesale&d=y&tc=main&blanktest=0&initiative_id=SB_20170927034752&origin=n&catId=0&isViewCP=y (https://www.aliexpress.com/af/amplifier-chassis.html?SearchText=amplifier+chassis<ype=wholesale&d=y&tc=main&blanktest=0&initiative_id=SB_20170927034752&origin=n&catId=0&isViewCP=y))
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A full set of connectors and wire tails are supplied with the amplifier board. With the power supply comes a longer umbilical than shown, and an AC connector with wire tails.
There is a large variety of chassis/enclosures available from either ebay or AliExpress (https://www.aliexpress.com/af/amplifier-chassis.html?SearchText=amplifier+chassis<ype=wholesale&d=y&tc=main&blanktest=0&initiative_id=SB_20170927034752&origin=n&catId=0&isViewCP=y (https://www.aliexpress.com/af/amplifier-chassis.html?SearchText=amplifier+chassis<ype=wholesale&d=y&tc=main&blanktest=0&initiative_id=SB_20170927034752&origin=n&catId=0&isViewCP=y))
That just makes a guy want to pick one up, if it's that easy. I don't need that much power for my speakers though. The main drawback to the classD boards is that it's hard to find one with more than one input. I suppose an input switcher works but I wonder about signal purity.
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Thanks Yatsushiro. 8)
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Have been listening the amp for couple weeks, sound very good with the Cornwall and it's quiet.
It's a top SS amp does well with the Cornwall.
Tested on 4 Ohms speaker, it did not sound right for some reason, only listened for few minutes.
Thanks Wushuliu. :thumb:
(http://www.audiocircle.com/image.php?id=170347)
(http://www.audiocircle.com/image.php?id=170348)
(http://www.audiocircle.com/image.php?id=170349)
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I have a Breeze tpa-3116 that sounds nice in my computer setup. Better than the Dayton Tripath I had been using. However, with my Quartets in the main system it sounds pretty bad. I've read that the breeze has excessive gain and that could be the problem with the high efficiency speakers. The Panasonic xr sa50 from my home theater sounds much better than the Breeze.
Even though I doubt I'd find one of these boards that would rival my Coda amp I still have the urge to check out new boards. This one mentioned, the volt+ and the TDA-7498 boards such as the smsl sa-98E at 160X2 etc. all have good reports on beating the tpa-3116.
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I have a Breeze tpa-3116 that sounds nice in my computer setup. Better than the Dayton Tripath I had been using. However, with my Quartets in the main system it sounds pretty bad. I've read that the breeze has excessive gain and that could be the problem with the high efficiency speakers. The Panasonic xr sa50 from my home theater sounds much better than the Breeze.
Even though I doubt I'd find one of these boards that would rival my Coda amp I still have the urge to check out new boards. This one mentioned, the volt+ and the TDA-7498 boards such as the smsl sa-98E at 160X2 etc. all have good reports on beating the tpa-3116.
If you don't need that much power the Volt+ sounds interesting with its capacitance multiplier feature. As for the Coda comparison, you never know, some people think these amps compete very well with high end. But my gut tells me a proper beefy linear power supply might be needed to really go toe to toe with an amp like that.
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My Favourite TPA3251 based amp.
(http://www.audiocircle.com/image.php?id=170375)
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My Favourite TPA3251 based amp.
Icepower. But it's a specific model, right? Only certain ones have TPA chips.
Not sure how I feel about the SMPS being on the same board as the amp...
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(http://www.audiocircle.com/image.php?id=170383)
It’s the 100AS. Icepower knows what they’re doing. The power supply on the same board isn’t an issue. All class D amps are going that way.
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If you don't need that much power the Volt+ sounds interesting with its capacitance multiplier feature. As for the Coda comparison, you never know, some people think these amps compete very well with high end. But my gut tells me a proper beefy linear power supply might be needed to really go toe to toe with an amp like that.
I think you are correct about the power supply. The Volt+ is probably my next try, as you mentioned, I really don't need any more power than that. The Allo Volt has a stepped attenuator added and comes in around $100.
Not to derail Wushuliu, but have you checked out any of the Chinese class A offerings such as the 1969 Hood? With shipping they run about $200 and I have read some good reports.
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This guy makes very nice TPA3251 based amps in Germany. However very hard to compete with the engineering experience at Icepower.
http://www.360customs.de/2016/10/tpa3255-tpa3251-tpa3245-universal-one-for-all/
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This guy makes very nice TPA3251 based amps in Germany. However very hard to compete with the engineering experience at Icepower.
http://www.360customs.de/2016/10/tpa3255-tpa3251-tpa3245-universal-one-for-all/
That guy is talented. He also thinks highly of the performance of the TI evm and the one i purchased, so I don't think I'm missing much compared to the ice power.
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(http://www.audiocircle.com/image.php?id=170383)
It’s the 100AS. Icepower knows what they’re doing. The power supply on the same board isn’t an issue. All class D amps are going that way.
I'm continually impressed by my Icepower 50ASX2-SE, and would like the opportunity to try an 100AS2, but I fear that they're not available to us mere DIY mortals...
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I'm continually impressed by my Icepower 50ASX2-SE, and would like the opportunity to try an 100AS2, but I fear that they're not available to us mere DIY mortals...
Sounds like you got yours up and running (hope the move went well). How's it compare to the TPA?
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Sounds like you got yours up and running (hope the move went well). How's it compare to the TPA?
We've still got both houses, so am spending varying amounts of time in both France and the UK...
I've set up my ICEpower with a buffer (http://www.ebay.co.uk/itm/Stereo-Tube-Preamp-Pre-amp-Board-Vacuum-Tube-Pre-Buffer-for-6N3-5670-6H3/291643694133?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649), driven by an RPi3 with Piano DAC in Dual Mono mode, running PicorePlayer - it is noticeably different to the TPA3250 and TPA3251 boards I have. I'm tempted to say better, with great definition, clear base etc, but I really need to do some refined comparisons using the same source.
On a practical side, having the power supply on board is a great benefit for packaging. For £17.50, the 50ASX2-SE is an absolute bargain and, I suspect, my 'go to' system...
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We've still got both houses, so am spending varying amounts of time in both France and the UK...
I've set up my ICEpower with a buffer (http://www.ebay.co.uk/itm/Stereo-Tube-Preamp-Pre-amp-Board-Vacuum-Tube-Pre-Buffer-for-6N3-5670-6H3/291643694133?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649), driven by an RPi3 with Piano DAC in Dual Mono mode, running PicorePlayer - it is noticeably different to the TPA3250 and TPA3251 boards I have. I'm tempted to say better, with great definition, clear base etc, but I really need to do some refined comparisons using the same source.
On a practical side, having the power supply on board is a great benefit for packaging. For £17.50, the 50ASX2-SE is an absolute bargain and, I suspect, my 'go to' system...
Interesting. Thanks.
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wushuliu,
I just picked up on this thread, so I thought I would chime in here about my latest experiences with the Texas Instruments TPA3255EVM Class D amplifier. I purchased this during the 50% off sale at TI, and then purchased a Mean Well LRS-350-48 switching power supply from Arrow for about $31.
The setup is rather crude in that I don’t even have an AC power switch in this setup. I added a pair of Altec Peerless 15335A 1:1 bridging transformers for converting single ended inputs into differential inputs. The wiring is Duelund DCA20GA oiled cotton-insulated Tin-plated Copper stranded wire, and the RCA input connectors are Neutrik chassis mounted connectors. Since I moved to Minnesota earlier this year and into an apartment, most of my electronics equipment is in storage including my drill press and wonderful Metcal soldering station. Everything is mounted on 1/4” thick Birch plywood sheets I picked up at Michaels.
Since my Klipsch Forte II floorstanding loudspeakers are too large for my living room, I searched a while for some bookshelf monitors that would give me the same lively presentation that my Klipsch speakers would give me. I found that in a pair of KEF LS50 speakers that I bought from a local dealer in Minnesota. Previously, I had my Wiener 2.0 TI TPA3118 PBTL (dual mono) amp and modified Astron RS-12A linear power supply working with the KEF’s and getting very pleasing results. However, once I switched to the more powerful TPA3255EVM amp, the KEF’s really opened up and the full, rich sound I’m getting out of these little monitors is astounding.
I am running the TPA3255EVM in stock form, but I intend to try out the PFFB (post filter feedback) mod, and possibly rig up a set of Wurth shielded inductors just to see how much I can eke out of this amp. If anyone tries the TI EVM out, I recommend that you allow at least 50 hours of play time before you really hear what sound quality this amp is capable of delivering.
My Forte II’s are in storage, and I have every intention of using them in my main rig once we move into a larger home. I am curious how they will sound with this more powerful TI Class D amp. I have a pair of bare TPA3251/3255 PCBs from drmord who regularly posts on the Class D forums on diyAudio.com. Once I have a complete lab setup again, I will build out drmord’s amps in PBTL mode and probably use an unregulated linear power supply consisting of a toroidal power transformer, bridge rectifier and RC filter.
(http://www.audiocircle.com/image.php?id=172176)
(http://www.audiocircle.com/image.php?id=172177)
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wushuliu,
I just picked up on this thread, so I thought I would chime in here about my latest experiences with the Texas Instruments TPA3255EVM Class D amplifier. I purchased this during the 50% off sale at TI, and then purchased a Mean Well LRS-350-48 switching power supply from Arrow for about $31.
thanks for the update Rich! Can't wait to hear your thoughts on the PFFB...
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I caved in and purchased another TI TPA3255EVM amplifier at half-off, so I can run the amps in PBTL (mono) mode. I’ll have to get parts to assemble an unregulated linear power supply to power both amp modules with a reasonable amount of current.
To implement PFFB, I am waiting on a few parts from Mouser on back-order, but I may check out Digikey to see if they have similar components in stock.
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I caved in and purchased another TI TPA3255EVM amplifier at half-off, so I can run the amps in PBTL (mono) mode. I’ll have to get parts to assemble an unregulated linear power supply to power both amp modules with a reasonable amount of current.
To implement PFFB, I am waiting on a few parts from Mouser on back-order, but I may check out Digikey to see if they have similar components in stock.
I came across the discussion on these at Klipsch forum recently. Did someone there compare linear PS to SMPS? I'd like to, but that would mean a new enclosure with pre-cutouts for mains, a giant expensive toroid, etc. etc.
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I came across the discussion on these at Klipsch forum recently. Did someone there compare linear PS to SMPS? I'd like to, but that would mean a new enclosure with pre-cutouts for mains, a giant expensive toroid, etc. etc.
wdecho didn’t actually compare a linear versus switching power supply for the TI TPA3255EVM, he just pieced together a nice unregulated linear power supply with many components he already had. Others like me went the lazy man’s route and purchased switching power supplies like the Mean Well LRP-350-48. What he did do was compare the TI TPA3255EVM to some of the Pass DIY First Watt amplifier clones he had, and the TI Class D compared favorably.
Hopefully, my other TPA3255EVM will arrive soon, and I will begin building an unregulated linear power supply. A good primer can be found here:
http://www.decdun.me.uk/gainclone_psu.html (http://www.decdun.me.uk/gainclone_psu.html)
Gainclone chip amps typically run off dual rail power supplies, but much of the information presented in this Web article can be applied to single rail power supplies like those that the TI TPA31xx and TPA 32xx Class D amps require.
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3E has been out of his power supply for a while now and he recommended I look into a Meanwell unit. Is the LRS-350-48 the go to or should I be looking at some other options.
Thanks so much.
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3E has been out of his power supply for a while now and he recommended I look into a Meanwell unit. Is the LRS-350-48 the go to or should I be looking at some other options.
Thanks so much.
I use a Mean Well LRS-350-48 to power my TI TPA3255EVM amp, and it is quiet. I’ve never had the cooking actually turn on, since it never gets hot. I use 14ga PVC-insulated Copper wire from an IEC power cable to connect the power supply to the amp. Arrow sells these for about $30.
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In 2015 I was musing on internet and discovered Flea Watt website and on a picture, I was able to understand the card was a TPA3116. At this moment I bought few cards to test, from Yuan Jing audio.
Then I want to China for 2 years. Without too much equipment to listen to music. In the city of Xi'an, I did not find shops to rebuild something acceptable, so I build for myself my system, using TPA3116... The cost is ridiculous and audio quality is not in direct relation with the price. After few weeks I got a very decent system.
I am also on the Texas Instrument mail list since years. I do not remember when, but few years ago I received a mail about the new high quality high power TPA3255. At this time the EVM was maybe at 300$. I checked on the Chinese side and there was no low cost card. At this time I tought the price of the EVM was to much for just curiosity and I was not completely satisfied with the Class D: I already have plenty of amplifiers, tubes, transistors, in different classes and even if some are worst than the TPA3116, plenty are better than it in term of audio quality.
In China there is the great numeric wall and I was not easily able to go on the TI website. Anyway, I am back in France since few months, and in november I received a mail from TI: the EVM was 50% off and the price was only 150$. So I went for 2 cards - in case I need 2x600W...
I received the cards and then was able to use one sample only one week before the holidays.
I tried few things. The lowest voltage is 15V. I tried batteries power, laboratory power and a power block for a computer, the same I use for the TPA3116.
I tought the lover voltage the lower level in term of sound pressure. It is not true. Less voltage means more distorsion and clipping when you turn the volume button.
I do not like the sound of the card with only 20V power unit.
I have tried with batteries: one batt around 30V, and also powerfull batt around 50V able of 200A in continuous.
I then started to use a lab power around 30V. With this power unit, the sound quality was enough. I can see the consumption on the power lab and at 30V, with speakers around 90dB of efficiency, the Amps are between 0.12 and 0.14 when I listen to music. When there is no music, EVM On, the consumption is between 0.1 and 0.11.
When I want to listen a bit louder, this is mainly less than 1A... But depending on the program, it could raise immediately to 10x this value.
I am happy for the moment with the power lab I am not able to detect difference with the big pack of batteries. Anyway, I will use another and more powerful Lab power when I will be back.
Also, I was afraid of so many watts with my little pair of speakers (for the moment) but the amp is not a brutal one (it could anyway). There is no noise, hum or anything annoying even putting the ear at 1cm of the speaker.
In term of sonic performances, the EVM Card is far far far from the TPA3116. I was happy to connect some of nice gear (for the moment plenty of my equipment is not at home) and the EVM board is incredible. I am impatient to use an XLR connection to the card and test it with different sources.
I think I will buy low cost TPA3255 from China to compare, but for the price, the EVM is completely incredible.
Class D is in good hands with TI and this is only the beginning.
http://fleawatt.blogspot.fr/
https://www.yuan-jing.com/
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This is a picture with the 30V batt
(http://www.audiocircle.com/image.php?id=173331)
And now the 50V:
(http://www.audiocircle.com/image.php?id=173332)
and with the power lab
(http://www.audiocircle.com/image.php?id=173336)
Sorry for the quality, it was with a smartphone.
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Have been listening the amp for couple weeks, sound very good with the Cornwall and it's quiet.
It's a top SS amp does well with the Cornwall.
Tested on 4 Ohms speaker, it did not sound right for some reason, only listened for few minutes.
Thanks Wushuliu. :thumb:
(http://www.audiocircle.com/image.php?id=170347)
Hello Trung, and anyone else that might like to help.
I just purchased the 3e-audio 3255. Should take a few weeks to show up and I'm wondering if I'm missing anything in the build or if I should add anything.
I have an enclosure with IEC, Meanwell 48v PS, RCA and speaker connectors. I need to order an on off switch. Is there a quality one anyone can recommend or any values I need to be aware of before I purchase one? In a best case scenario, what kind of wire would you recommend to do the internal wiring of the rca and speaker connectors?
Trung, what is that silver box attached to the IEC inside of your amp?
Thanks folks :-)
Edited: As I found this info to an earlier question.
I use 14ga PVC-insulated Copper wire from an IEC power cable to connect the power supply to the amp.
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Flavo, that box is probably an IEM filter. I believe it used to filter your house power line, many of lights or smps for other material can create interference and this should help remove them. Sorry can't help for the cables as I have not build one myself, yet. Your list looks complete to me but I am a newbie.
To all others, between this TPA3251 and an Icepower ASX125, which onewould you suggest ?
It is about the same price, although the the ASX125 has power supply on board but the TPA3251EVM still needs one.
Thanks
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Yes! IEC noise filter.
Trung sent me this link
https://www.schaffnerusa.com/technical-library/iec-inlet-filters/
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Flavo --
I just purchased the 3e-audio 3255. Should take a few weeks to show up and I'm wondering if I'm missing anything in the build or if I should add anything.
I am also interested in this. What are you using for volume control?
Are you using a volume pot -- or handling volume externally?
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I am also interested in this. What are you using for volume control?
Are you using a volume pot -- or handling volume externally?
Externally. I currently have a DAC with Vol pot but will be getting a preamp to handle the pot and a different DAC.
Unfortunately I'm of no help in knowing what values you need for a Pot. Hopefully one of the experienced folks will be able to help you out.
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I am also interested in this. What are you using for volume control?
Are you using a volume pot -- or handling volume externally?
The input impedance of the 3255 is IIRC ~24k. a 50k pot or lower is recommended, with lower being better. This is a generalization, YMMV.
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Externally. I currently have a DAC with Vol pot but will be getting a preamp to handle the pot and a different DAC.
Unfortunately I'm of no help in knowing what values you need for a Pot. Hopefully one of the experienced folks will be able to help you out.
Hi flavo, if you are putting an on/off switch from the Meanwell output then you can use whatever switch you want since the voltage will be pretty low at <50v. If you use a switch at the mains input you will of course want a switch rated for at or above your mains voltage of 120 or 220.
Wiring is up to you. My only recommendation is to have the power supply wiring be a healthy gauge. I like 16 or 14awg, but that's just my preference. I use silicone tinned 'racing' wire because it's cheap, withstands very high voltage and comes in large gauges and subjectively to me sounds decent (when used as speaker wire).
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Are these available in a ready made amp? I love DIY audio and enjoy building, but have almost zero free time these days......well a few hours to do crap like post on forums, but not enough to source component and build an amp I have a lepai 2020A powering my Merlin monitors in my computer monitor setup. Clearly an amp upgrade would help. Lepai is a decent dirt cheap little amp and I'm impressed it can even power these speakers. but it makes me want more. (decided upgraded PS not worth time or money)
If you wait for 1 yr, you will see SMSL stick a DAC and a PSU with a LCD panel for around 500. Check out SMSL A8 with ice power.
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https://www.ebay.com/itm/FXAUDIO-FX502SPRO-TPA3250-Class-D-Digital-Amplifier-Hi-Fi-Stereo-Audio-Power-Amp-/253284553008 (https://www.ebay.com/itm/FXAUDIO-FX502SPRO-TPA3250-Class-D-Digital-Amplifier-Hi-Fi-Stereo-Audio-Power-Amp-/253284553008)
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Everything is in except a fuse and holder. I didnt think to order one and googling doesn't seem to be helping me.
How do I know what size fuse to install for the 3255 with the Meanwell 48V PS?
The specs on the Meanwell are --350.4W 48V 7.3A 115Vac or 230Vac
So my guess would be a 10A 250V fuse?
If that's correct. Do I want a slow blow? Does it matter if it's 5x20 or 6.3x30 and lastly, does anyone have a suggestion on a inline fuse holder? I was thinking it would be easier to find a audio quality one but that's proven difficult as well.
Thanks so much.
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Everything is in except a fuse and holder. I didnt think to order one and googling doesn't seem to be helping me.
How do I know what size fuse to install for the 3255 with the Meanwell 48V PS?
The specs on the Meanwell are --350.4W 48V 7.3A 115Vac or 230Vac
So my guess would be a 10A 250V fuse?
If that's correct. Do I want a slow blow? Does it matter if it's 5x20 or 6.3x30 and lastly, does anyone have a suggestion on a inline fuse holder? I was thinking it would be easier to find a audio quality one but that's proven difficult as well.
Thanks so much.
? Doesn't the mean well have an internal fuse?
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:duh:
Just did a google image search and the meanwell does indeed have a fuse inside of it.
Thank you. I'll be sure to post some pics when I'm done.
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Following, reading, trying to digest and learn. 8)
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https://www.ebay.com/itm/FXAUDIO-FX502SPRO-TPA3250-Class-D-Digital-Amplifier-Hi-Fi-Stereo-Audio-Power-Amp-/253284553008 (https://www.ebay.com/itm/FXAUDIO-FX502SPRO-TPA3250-Class-D-Digital-Amplifier-Hi-Fi-Stereo-Audio-Power-Amp-/253284553008)
Ordered one of these amps from China (though from a different seller since the one listed in the link sent me a star ornament rather than the amp itself. At least I got refunded). And I have to say that I'm impressed. It replaced a Fleawatt w/ Astron power supply that I'd been using in my system with a ModWright Oppo BD-105 and GR Research Diluceos. More detail and more punch (probably because it is more powerful). But the nice thing about the amp is that you can play with the opamps. I initially put in opa2227's, which improved the separation as well as musically. Now that I've gotten some opa627's, which probably are my favorite opamp musically, this is really turning into a nice amp for about $100. Cheap and cheerful. Can't go wrong.
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Ordered one of these amps from China (though from a different seller since the one listed in the link sent me a star ornament rather than the amp itself. At least I got refunded). And I have to say that I'm impressed. It replaced a Fleawatt w/ Astron power supply that I'd been using in my system with a ModWright Oppo BD-105 and GR Research Diluceos. More detail and more punch (probably because it is more powerful). But the nice thing about the amp is that you can play with the opamps. I initially put in opa2227's, which improved the separation as well as musically. Now that I've gotten some opa627's, which probably are my favorite opamp musically, this is really turning into a nice amp for about $100. Cheap and cheerful. Can't go wrong.
Thanks for the review. Especially about the opamps. I hadn't thought about whether different opamps might affect sound for these TPA32XX amps (too busy being impressed by what I heard). So this opens up a whole new avenue for exploration.
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Thanks for the review. Especially about the opamps. I hadn't thought about whether different opamps might affect sound for these TPA32XX amps (too busy being impressed by what I heard). So this opens up a whole new avenue for exploration.
Given that it's been at least 8 years since I've thought much about opamps, any suggestions about others to try? I'd played around with a bunch in the past and had settled on the opa627's in my Maverick DAC, but I'm sure that there are better things out now.
Also, before I forget, if one is going to put opa627's in this amp, they need to be dual SOIC to DIP8. The DIP to DIP ones won't fit.
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Given that it's been at least 8 years since I've thought much about opamps, any suggestions about others to try? I'd played around with a bunch in the past and had settled on the opa627's in my Maverick DAC, but I'm sure that there are better things out now.
Also, before I forget, if one is going to put opa627's in this amp, they need to be dual SOIC to DIP8. The DIP to DIP ones won't fit.
Class D operation is way above my pay grade. I think the opamps are just buffers for single ended input to differential conversion. In this context your guess is as good as mine.
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Can the TPA3251/55 boards be setup for balanced XLR inputs?
I have a Class D Audio SDS470 4-channel amplifier. I was wondering
about using it's case, toroidal transformer and power supply and just
swapping in 2 of these boards? ...is that possible? ...practical and safe?
Thanks for any replies in advance :)
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Can the TPA3251/55 boards be setup for balanced XLR inputs?
I have a Class D Audio SDS470 4-channel amplifier. I was wondering
about using it's case, toroidal transformer and power supply and just
swapping in 2 of these boards? ...is that possible? ...practical and safe?
Thanks for any replies in advance :)
If you are referring to the EVM's, they can be configured to accept differential inputs. However, the inverted and non-inverted signal will each pass through it's own amplifier to a BTL output.
These are signal supply amplifiers. If you use the ClassDAudio power supply, make sure you connect it right!
Mike
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Just curious: is there a TPA3255 version of this? might order one to compare with my NuPrime and Mivera amps (which are enough for me!)
Ordered one of these amps from China (though from a different seller since the one listed in the link sent me a star ornament rather than the amp itself. At least I got refunded). And I have to say that I'm impressed. It replaced a Fleawatt w/ Astron power supply that I'd been using in my system with a ModWright Oppo BD-105 and GR Research Diluceos. More detail and more punch (probably because it is more powerful). But the nice thing about the amp is that you can play with the opamps. I initially put in opa2227's, which improved the separation as well as musically. Now that I've gotten some opa627's, which probably are my favorite opamp musically, this is really turning into a nice amp for about $100. Cheap and cheerful. Can't go wrong.
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TI is offering an evaluation board of the TPA3255
TPA3255EVM (https://store.ti.com/TPA3255EVM-TPA3255-315W-Stereo-600W-Mono-Ultra-HD-Analog-In-Audio-Class-D-Module-P50753.aspx)
If you register on the site, you can then use the code "highpoweraudio" on checkout to get 50% off.
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Thx
Have had my eyes on this. But don’t know how this compares with the finished amps on eBay with the same chip
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Thx
Have had my eyes on this. But don’t know how this compares with the finished amps on eBay with the same chip
I think the fxpro is basically a knock off of the tpa. It may not be of the same quality and features such as the various adjustable parameters of the TPA. But all I hear is that it sounds very good, especially with a linear supply.
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Out of all these chip amps is the best one this tpa3255evm? Then I will try this vs the fx502.
Thx
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Out of all these chip amps is the best one this tpa3255evm? Then I will try this vs the fx502.
Thx
Depends on your speaker load and power needs. If your speakers are 6-8ohms the TPA3255, if your speakers are 2-4ohm and low efficiency, then TPA3251. Get the evm from TI for best performance/reliability or the 3eaudio modules on ebay.
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Hmmm while my speakers in my study say they are 8ohms, in reality they vary from 3.7 to 8 (KEF Q100) .... hence the confusion. They are rated 87dB
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Hmmm while my speakers in my study say they are 8ohms, in reality they vary from 3.7 to 8 (KEF Q100) .... hence the confusion. They are rated 87dB
That means the woofer goes down to 4ohms and the tweeter is 8ohm. The 3255 should be fine.
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Cool. Thx. .... I also need a good power supply if I go the EVM route. Any opinions?
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Cool. Thx. .... I also need a good power supply if I go the EVM route. Any opinions?
Oops, found the measurements on the Q100, that tweeter is a 4ohm tweeter. So not sure how they got 8ohms out of it, I think there's a little fudging there. But the 3255 should still be fine.
As for PS, a single rail 48v Meanwell PS will give max power, but the TI evm takes as low as 14v - so just depends how much power you think you need. No need to get a fancy PS, these amps are very tolerant.
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TI is offering an evaluation board of the TPA3255
TPA3255EVM (https://store.ti.com/TPA3255EVM-TPA3255-315W-Stereo-600W-Mono-Ultra-HD-Analog-In-Audio-Class-D-Module-P50753.aspx)
If you register on the site, you can then use the code "highpoweraudio" on checkout to get 50% off.
I believe this offer has now expired :(
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Here is a great 14v PS for $30. You will be amazed on what it does to your sound. These will beat some of the $400 PS's out there. It looks beat-up, but some spray paint will fix that.
https://www.ebay.com/itm/ASTRON-13-8-VOLT-10-AMP-POWER-SUPPLY-MODEL-RS-10A/202355918822?hash=item2f1d5a47e6:g:JyEAAOSwQGhbKrmH
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Here is one more finished amp (with bluetooth and tone controls, YJ Audio). It doesn't say if the sub channel is crossed over over or not.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=Finished+HIFI+TPA3255&_sacat=0
David
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doesnt come with power btw
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Here's a link to a 24v/5A Meanwell PSU that Jameco is selling. I think this is the one that Nelson Pass recommends for the new Amp Camp Amp (see diy audio store).
https://www.jameco.com/z/GST120A24-P1M-MEAN-WELL-24-Volt-5-Amp-120-Watt-Regulated-Switching-Table-Top-Power-Supply-120-Watts-Cylindrical-Female_2223646.html?CID=GOOG&gclid=CjwKCAjwspHaBRBFEiwA0eM3kT_klxcSaeiD0VEuI_V8ptILpe48a_UA7g85OxHMLSQHad24iJyo_hoCJ58QAvD_BwE (https://www.jameco.com/z/GST120A24-P1M-MEAN-WELL-24-Volt-5-Amp-120-Watt-Regulated-Switching-Table-Top-Power-Supply-120-Watts-Cylindrical-Female_2223646.html?CID=GOOG&gclid=CjwKCAjwspHaBRBFEiwA0eM3kT_klxcSaeiD0VEuI_V8ptILpe48a_UA7g85OxHMLSQHad24iJyo_hoCJ58QAvD_BwE)
Also, Jameco is selling the 48v/2.5A version for the same price.
https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&freeText=GST120A48-P1M&langId=-1&storeId=10001&productId=2223654&krypto=1TTcwwa9xwRy%2BFBXAoB68j48rnYWZvWt3XkBff4XQhprTtVFmrqPmYHOaXOHbQHiDGkw9yfDuWcmQkn9pT2sCIvWLoFllBXC8eDqnvdt%2BJY%3D&ddkey=https%3AStoreCatalogDrillDownView (https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&freeText=GST120A48-P1M&langId=-1&storeId=10001&productId=2223654&krypto=1TTcwwa9xwRy%2BFBXAoB68j48rnYWZvWt3XkBff4XQhprTtVFmrqPmYHOaXOHbQHiDGkw9yfDuWcmQkn9pT2sCIvWLoFllBXC8eDqnvdt%2BJY%3D&ddkey=https%3AStoreCatalogDrillDownView)
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This one would also probably work.
https://www.ebay.com/itm/32V-5A-High-Power-Switching-Power-Supply-Adapter-200W-for-Aduio-Amplifier/282863815350?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
David
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This one would also probably work.
https://www.ebay.com/itm/32V-5A-High-Power-Switching-Power-Supply-Adapter-200W-for-Aduio-Amplifier/282863815350?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
David
If this is a good power supply its an easy options. Might be a nice way to get started, atleast!
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How do you men who have used the 3255 amp think it would be as surround sound channels. My main amp would run the front right and left and then I need three more channels for my center and rears. If I purchased two of these amps and built a 3 channel amp it seems like a very reasonably priced solution. Or could I use the sub channel somehow for the center?
Surround sound for me is really a secondary venture and I just want it to sound good, it doesn't have to be great. I'm going to use a couple of bookshelf speakers for the rear channels and I have a good center that is pretty efficient. Power shouldn't be a problem with these amps and it would be fun to build something like this for the purpose.
Any thoughts would be appreciated.
Thanks,
Greg
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The YJhifi Audio only has a left and light channel input the bass channel was meant to power a sub. I just hooked up the sub speaker connection to my Paradigm speakers and only heard some bass notes come out.
I am satisfied with the sound from both the YJ Audio and the FX Audio amps, they sound very similar. I would be hard pressed to tell the difference between the amps sound wise.
These do seem to be superior in sound to the 3116 amps I was using in my office system before.
YJ positives:
-Has blue tooth connection
-Can power a subwoofer (unknown crossover point)
-Theoretically more powerful than FX audio fx502s pro (depending on your power supply)
YJ negatives:
-The YJ audio has an annoying pop when powered on (I think it switching between bluetooth or line connections).
-volume pot feels cheap, has some rough spots when turning
-doesn't come with power supply
-need to kill bluetooth connection for line inputs to work (no manual switch on unit)
FX positives:
-no tone controls (a negative to some)
-smoother volume, has larger knob
-Has digital power switch
-can play with op amps
-comes with a 24v 4A power supply
David
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Heard from 3e audio that 3255 and smps will be available in next few weeks. They are working on getting them ready. They will be available in their eBay store.
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Just as a curiosity, I wonder how do 3255 sound in comparison with the Hypex modules (NC252P). From my experience the hypex smps play a big role in the sound of their amps. I have tried NC500 with other non Hypex SMPS and there is a noticeable difference in sound.
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David, could you point me to the FX audio 3255 amp? I only see the FX amp using the TPA 3250.
Thanks,
Greg
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Here is the Amp Board as a 2 channel unit (https://www.aliexpress.com/item/K-GUSS-Class-D-TPA3255-MINI-HIFI-AUDIO-Digital-Amplifier-Board-300W-300W-DC50V/32844175957.html?spm=2114.10010108.1000013.1.712235f7xxp4i8&scm=1007.13339.90158.0&scm_id=1007.13339.90158.0&scm-url=1007.13339.90158.0&pvid=1affe609-ba5f-4d34-a9d8-7ae9d0bee3ae&_t=pvid:1affe609-ba5f-4d34-a9d8-7ae9d0bee3ae,scm-url:1007.13339.90158.0)
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>David, could you point me to the FX audio 3255 amp? I only see the FX amp using the TPA 3250.
>Thanks,
>Greg
Sorry Greg, I was talking about two different chips. I did not state this in my comparison. For FXAudio, I only saw the TPA3250 model. I'm unaware of any FXAudio TPA3255 amps.
David
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The YJhifi Audio amp is very strange. I don't know if it has a design flaw or I just got a bad unit.
If I turn it on without it paired with my cell phone it would make continual popping sounds when it tries to lock in on either blue tooth or the line input.
If it is paired and then turned on it will pop once and lock and the blue indicator light would come one, then I can unpair it and use the line input.
If anyone has this amp please let me know if yours behaves the same way or not. If this is in the design, this amp should probably be avoided unless you are definitely only using blue tooth.
David
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I would avoid any cheap chinese amp with blue tooth unless that's the feature you need or sound quality is secondary. The more chips/features are added the more noise there will be to the system and any software programming involved will likely be subpar.
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It is behaving better now, I had 'ended my connection', It looks like I just had to 'Forget' the bluetooth connection on my phone.
David
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What you do think of this board from ALI-E?
https://www.amazon.com/DC50V-TPA3255-Class-Digital-Amplifier/dp/B0776NFRRB (https://www.amazon.com/DC50V-TPA3255-Class-Digital-Amplifier/dp/B0776NFRRB)
Looks pretty plug and play for even the non-DIYer.
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What you do think of this board from ALI-E?
https://www.amazon.com/DC50V-TPA3255-Class-Digital-Amplifier/dp/B0776NFRRB (https://www.amazon.com/DC50V-TPA3255-Class-Digital-Amplifier/dp/B0776NFRRB)
Looks pretty plug and play for even the non-DIYer.
They look easy to put together but just be aware that those binding posts seem to stick out pretty far on the underside of the board.
It might make it a bit harder to mount in a box.
--David L.
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Are there any ti modules with plug in op amps?
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I'm looking for an amp to drive a pair of Dahlquist DQ-10's which require 250w each @8 ohm. Been using a Hafler-500 for years but want to go class-D. Definitely want THD that's comparable to the hafler, and looks like the 3255 can be used to do this. However, I can't find a dual-channel @250 into 8. Any guidance?
THanks!
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A few weeks ago, I wanted to purchase the Aiyima TPA3255 2.0 amp through eBay, but the seller in China could not ship the amp due to the COVID-19 virus outbreak. They were great about it and refunded my payment, that left me with the only option to purchase the Aiyima TPA3251 2.0 amp through Amazon.com who had some inventory of these amps in the US.
I connected this amp to my main system using my Audio Research LS7 tube line stage preamp and modified Klipsch Forte II speakers. This is where I started my critical music listening and discovered that the right and left channels are reversed, so I switched my right and left hand RCA interconnect connections. My reference power amplifiers are a rebuilt McIntosh MC240 vacuum tube amp and Pass DIY Sony VFET Class A solid state amp I built with the diyAudio.com store kit offered several years ago.
Both of my reference amps are excellent and I am quite pleased with the low distortion, highly musical performances of both amps in my system. I connected the Aiyima amp to the Audio Research preamp and my speakers, and I have to say this little amp is impressive. First of all, it is very quiet with no music playing through it. I held my ear close to my high sensitivity Klipsch speakers and heard no noise. As for the sound, it is not as good as my reference amps, but it wasn’t that far off either, which is astounding considering that this amp is only $50 USD. The fact that the channels are reversed is my only real complaint about this amp.
I have my volume on the Audio Research set in the normal position I use for most listening, and I have the volume pot on the Aiyima amp set to 2 to 2:30 o’clock with best results at my usual listening level. I am very impressed with the frequency response from the lower registers to the treble. This amp has a smooth, neutral frequency response and tone. What is surprising is the separation and detail I hear with this little amp. The soundstage is large, but could have more depth. I am satisfied with my purchase even with the mislabeled channel connections.
I have placed an order for the OPA1622 op amps on DIP8 adapters, and I will try those. If I hear a significant improvement, I might be tempted to try the NJR MUSES02 op amps.
(https://www.audiocircle.com/image.php?id=205595)
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did you have to add a power supply for the aiyima?
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Yes. I wired up a Mean Well LRS-200-36 switching power supply and dialed the out to 30VDC to play it safe with the 35VDC-rated 3000uF Elna power filter caps inside the amp (two larger caps sitting next to the TPA3251 heat sink. I will put it into a nice Aluminum case with an IEC inlet and switch soon. Right now, it is mounted a piece of plywood.
(https://www.audiocircle.com/image.php?id=205596)
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Rotated, optimized...
Aiyima TPA3251 2.0 HD325X Rev2.1, inside
(https://www.audiocircle.com/image.php?id=205599&size=huge)
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This looks intriguing. It's been 20 years since i have been into hi fi. I have lots old catching up to do.
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Just bought the Aiyima TPA3251 from Aliexpress. Looking forward to trying it out.
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My amazon-sourced Aiyima TPA3251 (US$ 50) arrived.
Out-of-the-box impressions are very positive. No harshness or distortion in any of the frequency range to my 50 y.o. ears.
Seller power supply spec is DC18-35V with DC32V 5A recommended, and I have a 32v-3A unit somewhere,
but a 24v 5A unit provided sufficient volume as a stand-in.
Nice case, but I had to use banana plug terminated speaker cable - no room to use my cables with spade lugs
due to RCA input proximity. So far, a C&C success.
The other amp of this type I've heard in this system is the (WINGONEER) TDA7498SE board with the 32V-3A PS.
It was the first high power chip amp to convince me of class D's ability to control a LF driver. Effortless volume
without triggering the fan, was my impression at the time. A little hiss in quiet passages, but for US$27, quite impressive.
system:
DAC > FX-Audio Tube preamp/buffer > ( this amp ) > 90 dB efficient 4 ohm acoustic suspension tower speakers
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Rotated, optimized...
Aiyima TPA3251 2.0 HD325X Rev2.1, inside
(https://www.audiocircle.com/image.php?id=205599&size=huge)
You have received the original Tilear version of this Aiyima TPA3251 Amplifier with the Black PCB which I believe are the better models. I also recently received one but it had the newer green PCB and some lower quality capacitors. I have upgraded the Op-Amps to the OPA1656 ones which seem to work well and actually sound very similar to the OPA1622 that I have also tried. I also use the Mean Well SMPS LRS-200-24 turned up to 30 volts !
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I see there is a TPA3255 amp (mono) that has a crossover that you can take out of the circuit with a switch. If anyone wanted to try out using two separate mono amps. It looks like Fosi Audio and Aiyima make one. They might be using the same boards. I'm not sure both come with power supplies or not.
https://www.amazon.com/Subwoofer-Audio-Full-Frequency-Switchable-Fosi/dp/B07VHG2LR9/ref=sr_1_1?dchild=1&keywords=Fosi+Audio+M03&qid=1590159801&s=electronics&sr=1-1
https://www.amazon.com/Subwoofer-Amplifier-Full-Frequency-Switchable-TPA3255D2/dp/B07VB3BRVF/ref=sr_1_2?dchild=1&keywords=300+Watt+Mini+Mono+Audio+Amp+Full-Frequency&qid=1590159309&s=electronics&sr=1-2
David
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I will likely pick up one of the 3255 amps on eBay. I am covered on the power supply. Replacing op amps is new to me. I'd like to try upgrading, but I don't know about that. I have seen the MUSES02 recommended. I looked on eBay and within MUSES02 there are a number of choices at very different price points. Perhaps someone knows of a good article for guidance on this. I did not find it. Recommendations for a good replacement op-amp will be appreciated.
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https://www.diyaudio.com/forums/class-d/276982-tpa3251d2-128.html
Hello,
Look at this thread as from page 128 (bottom) and on ...
several pages about opamp rolling
Enjoy...
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Has anyone added a 12VDC brushless fan to the Aiyima A07? I'm building a custom case and was curious if adding a DC/DC buck converter internally would introduce noise.
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Has anyone added a 12VDC brushless fan to the Aiyima A07? I'm building a custom case and was curious if adding a DC/DC buck converter internally would introduce noise.
I would not wish test it myself, I would use a aluminium heatsink.
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To iterate, I meant I would jumper off the supplied 36V power supply, not from anywhere on the A07 board itself.
I tested the brushless fan with a 9V battery and it flows great with no noise itself.
(https://www.audiocircle.com/image.php?id=257643)
(https://www.audiocircle.com/image.php?id=257644)
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I would use a 120V fan connected to the wall, not connected to the amp supply.
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Ok. I'll err on side of caution and not use the fan for the A07 board as it seems to be cooling just from convection with heat sink fins placed vertically.
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If you live on a cold área not need fan IMO.
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(https://www.audiocircle.com/image.php?id=257644)
@xschop Have you finished your project? :popcorn:
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Case is machined and waiting on CNC lathe again for dial completion. I really like how the whole case acts as a heat sink....
(https://www.audiocircle.com/image.php?id=259589)
(https://www.audiocircle.com/image.php?id=259590)
(https://www.audiocircle.com/image.php?id=259591)
(https://www.audiocircle.com/image.php?id=259593)
(https://www.audiocircle.com/image.php?id=259594)
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Hi,
I like people that build their own stuff.
I will follow with interest this project.
Thanks for sharing.
Double A
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@xschop Very well done, congratulations on your enthusiasm. :thumb:
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Thanks gents. I have been wanting to design an amp case like this for awhile for aesthetics and function. I really like the sound of this Class D amp and it deserves a custom case.
The design goal is to have all hardware/fasteners hidden with a minimalist appearance and have ability to swap in different amp board later if I want....
(https://www.audiocircle.com/image.php?id=259613)
(https://www.audiocircle.com/image.php?id=259610)
I was running it 3/4 volume throttle on the shop speakers all weekend and it never skipped a beat. I could feel the warmer air circulating through lower vent holes by simple convection. Don't even need a fan running in this unit...
(https://www.audiocircle.com/image.php?id=259611)
(https://www.audiocircle.com/image.php?id=259612)
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Fine tuning the dial interface/fitment. A couple thousandths each side is the key to smooth-as-butter operation :)
(https://www.audiocircle.com/image.php?id=260146)
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Wanted the dial to mimic my favorite museum watch....Will do final assembly today. Happy New Year everyone....
(https://www.audiocircle.com/image.php?id=260199)
(https://www.audiocircle.com/image.php?id=260197)
(https://www.audiocircle.com/image.php?id=260198)
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Been running the XS-8TL's with this amp for better part of the last week with my phone DAC and FLAC files.
Barely gets warm running them half volume on the dial.
I took the dial back off and reset it to 6'oclock being zero.
WAF is at 100% too as opposed to the amp and CD player in the living room.
(https://www.audiocircle.com/image.php?id=260373)
(https://www.audiocircle.com/image.php?id=260374)
Here's a pic where I removed the fan so you can see direct airflow path to heatsink radiator.
I also added 3/8" height rubber feet
(https://www.audiocircle.com/image.php?id=260375)
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Too big.
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Sure would be a helluva lot easier to put it in a Folgers coffee can.... get about the same shielding effect.
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Too big.
Here are the base dimensions...
(https://www.audiocircle.com/image.php?id=260377)
I figured out how to upload pics here (I think). It takes up 1/4 the space that my restored Onkyo A8017 amplifier did. It sounds every bit as clear and powerful too.
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Nice, thank you :thumb:
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Sure would be a helluva lot easier to put it in a Folgers coffee can.... get about the same shielding effect.
That'd be 0% challenge and 0% WAF option. :lol:
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Ran my billet 3255 amp all day yesterday and still this morning, hooked up to the modded CX100's and the Polk RM-1000 passive subwoofer in the bedroom... Amp case finally started getting warm after 6 hr's playtime 3/4 volume.... B)
(https://www.audiocircle.com/image.php?id=260803)
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Color me impressed. More detail and separation of vocals/instruments with these little jewels...Is there a break-in time with those op-amps? Hard to believe it get any better....
(https://www.audiocircle.com/image.php?id=261148)
(https://www.audiocircle.com/image.php?id=261149)
(https://www.audiocircle.com/image.php?id=261150)