TPA3251/55 High Power Class D Amplifiers

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envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #60 on: 8 Jul 2018, 05:06 am »
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.

Wayne1

Re: TPA3251/55 High Power Class D Amplifiers
« Reply #61 on: 8 Jul 2018, 06:03 pm »
TI is offering an evaluation board of the TPA3255

TPA3255EVM

If you register on the site, you can then use the code "highpoweraudio" on checkout to get 50% off.

envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #62 on: 8 Jul 2018, 08:43 pm »
Thx

Have had my eyes on this. But don’t know how this compares with the finished amps on eBay with the same chip

fredgarvin

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #63 on: 8 Jul 2018, 09:32 pm »
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.

envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #64 on: 9 Jul 2018, 12:10 am »
Out of all these chip amps is the best one this tpa3255evm? Then I will try this vs the fx502.

Thx

wushuliu

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #65 on: 9 Jul 2018, 01:26 am »
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.

envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #66 on: 9 Jul 2018, 05:37 am »
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

wushuliu

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #67 on: 9 Jul 2018, 05:43 am »
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.

envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #68 on: 9 Jul 2018, 05:48 am »
Cool. Thx.   .... I also need a good power supply if I go the EVM route. Any opinions?

wushuliu

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #69 on: 9 Jul 2018, 06:05 am »
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.

Yatsushiro

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #70 on: 9 Jul 2018, 08:26 am »
TI is offering an evaluation board of the TPA3255

TPA3255EVM

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  :(

OzarkTom

Re: TPA3251/55 High Power Class D Amplifiers
« Reply #71 on: 9 Jul 2018, 12:43 pm »
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

davidldl

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #72 on: 9 Jul 2018, 05:44 pm »
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

envydd

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #73 on: 9 Jul 2018, 08:31 pm »
doesnt come with power btw



HT cOz

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #76 on: 12 Jul 2018, 05:15 am »

gregfisk

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #77 on: 12 Jul 2018, 06:12 am »
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

davidldl

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #78 on: 12 Jul 2018, 02:09 pm »
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

Studio19atx

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Re: TPA3251/55 High Power Class D Amplifiers
« Reply #79 on: 12 Jul 2018, 04:27 pm »
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.