$175 Class D amp--120 wpc

ichillpill · « **Reply #1520 on:** 4 Jun 2010, 07:46 pm »

Quote from: walkern on 4 Jun 2010, 07:20 pm

I'm convinced those amps are worth the time and effort and money to mount in a decent looking chassis.

I am too! I'm just drawn into the music...

ichillpill · « **Reply #1521 on:** 6 Jun 2010, 02:47 pm »

Would like to see pics of black Par Metal cases if anyone has them...

joamonte · « **Reply #1522 on:** 7 Jun 2010, 03:34 am »

My Humble SDS 258...

Sorry for the Bad photo, taken with I-phone...

Have any one have experience suddenly shut off for a few second when playing fast transient music with your Super Class D?

My SDS 258 drive my Marten Coltrane(8 ohm) or Harberth LS 3/5a (11ohm) with ease no problem, but driving the Amphion Helium 510 will occasionally shut down a few second when playing music with lot of fast transient....could be due to the loudspeaker impedance?

ichillpill · « **Reply #1523 on:** 7 Jun 2010, 04:17 am »

That looks sweet! So is that a silver anodized enclosure from Par Metal?

santacore · « **Reply #1524 on:** 7 Jun 2010, 02:26 pm »

Nice build joamonte, I'm really digging that case.

Steidl Guitars · « **Reply #1525 on:** 7 Jun 2010, 03:33 pm »

Quote from: joamonte on 7 Jun 2010, 03:34 am

My SDS 258 drive my Marten Coltrane(8 ohm) or Harberth LS 3/5a (11ohm) with ease no problem, but driving the Amphion Helium 510 will occasionally shut down a few second when playing music with lot of fast transient....could be due to the loudspeaker impedance?

First, nice build! Mine is not a super, but it has occasionally gone into protection mode with speakers that are harder to drive. When I leave the cover off, it doesn't happen, so it seems to be a result of heat.

Tom suggested that I increase the amount of heat sink, which I just did this weekend so I'm optimistic.

You might try running it without the cover to see if that helps.

srb · « **Reply #1526 on:** 7 Jun 2010, 04:11 pm »

It appears a number of people have had the amp go into protection mode with their 4 ohm speakers.

It is true that there are some speakers that present a very difficult load to an amplifier, and some of these 4 ohm "nominal" speakers may in fact spend some time down in the 2 ohm region. But a well-designed power amplifier should be able to drive 98% of the speakers out there.

Adding heat sinking or getting relief with the cover off really seems to point to the heat sink simply having too little area to begin with.

Steve

Steidl Guitars · « **Reply #1527 on:** 7 Jun 2010, 05:17 pm »

Quote from: srb on 7 Jun 2010, 04:11 pm

Adding heat sinking or getting relief with the cover off really seems to point to the heat sink simply having too little area to begin with.

Tom has been pretty clear about the limitations of the heat sink in the original versions, which is too small for heavier loads. To overcome that limitation, I think, is part of the reason why he created his newer models with a different heat sink.

srb · « **Reply #1528 on:** 7 Jun 2010, 05:38 pm »

I was originally looking at the CDA-258 amp. I was told in February that the heat sink had been upgraded and that the amp was rated for 375W/channel at 4 ohms.

Certainly having the consistency of all of the amplifier models rated at 4 ohm would allow for better comparison and an easier selection decision.

But 4 months later, the photo of the CDA-258 does not show the upgraded heat sink, the description still only lists power at 8 ohm, and the newer SDS-258 with the upgraded heatsink also only still lists power at 8 ohm.

That is why I did not pull the trigger. I am assuming that those that have had a shutdown problem did not have one with their previous amplifier that it replaced.

Steve

guest1632 · « **Reply #1529 on:** 7 Jun 2010, 05:56 pm »

Quote from: srb on 7 Jun 2010, 05:38 pm

I was originally looking at the CDA-258 amp. I was told in February that the heat sink had been upgraded and that the amp was rated for 375W/channel at 4 ohms.

Certainly having the consistency of all of the amplifier models rated at 4 ohm would allow for better comparison and an easier selection decision.

But 4 months later, the photo of the CDA-258 does not show the upgraded heat sink, the description still only lists power at 8 ohm, and the newer SDS-258 with the upgraded heatsink also only still lists power at 8 ohm.

That is why I did not pull the trigger. I am assuming that those that have had a shutdown problem did not have one with their previous amplifier that it replaced.

Steve

Hi Steve,

You might want to contact Tom about this. He wrote me that he is working on a module that will work in a 2 ohm configuration that is will handle difficult loads down to 2 ohm loads If I were buying one right now, I'd get the SDS254.

Ray Bronk

wushuliu · « **Reply #1530 on:** 7 Jun 2010, 10:55 pm »

I've decided to stick w/ my current wooden enclosure for my amp, so my unused Par-Metal enclosure is for sale. I will put up a proper post in the classified section this evening.

I just prefer wood (yes, I know, *that's what she said*)

Mariusz · « **Reply #1531 on:** 7 Jun 2010, 11:36 pm »

Quote from: wushuliu on 7 Jun 2010, 10:55 pm

I've decided to stick w/ my current wooden enclosure for my amp, so my unused Par-Metal enclosure is for sale. I will put up a proper post in the classified section this evening.

I just prefer wood (yes, I know, *that's what she said*)

Those cases are very nice for the money.
I would buy it of you but unfortunately I've way too much wood laying around.
So yes, wood for me too. (and 1/8" aluminium plate -top/bottom)

P.S
Thanks for being considerate

•edit for typo•

Cheers
Mariusz

wushuliu · « **Reply #1532 on:** 7 Jun 2010, 11:45 pm »

Quote from: Mariusz on 7 Jun 2010, 11:36 pm

Those cases are very nice for the money.
I would buy it of you but unfortunately I've way too much wood laying around.
So yes, wood for me too. (and 1/8" aluminium plate -top/bottom)

P.S
Thanks for being considerate
•edit for typo•

Cheers
Mariusz

Actually, I see that I'm still within my 30 days so I will try and return to them first. Sorry for the tease everyone

...

Mariusz · « **Reply #1533 on:** 7 Jun 2010, 11:48 pm »

ichillpill · « **Reply #1534 on:** 8 Jun 2010, 12:11 am »

Pm sent Wush

daniloreyes · « **Reply #1535 on:** 10 Jun 2010, 05:54 am »

getting my cda-1000 soon...

HT cOz · « **Reply #1536 on:** 10 Jun 2010, 05:02 pm »

Quote from: Mariusz on 7 Jun 2010, 11:36 pm

Those cases are very nice for the money.
I would buy it of you but unfortunately I've way too much wood laying around.
So yes, wood for me too. (and 1/8" aluminium plate -top/bottom)

P.S
Thanks for being considerate
•edit for typo•

Cheers
Mariusz

This might be a stupid question, but how do you ground a wooden case?

Nick77 · « **Reply #1537 on:** 10 Jun 2010, 05:29 pm »

Quote from: HT cOz on 10 Jun 2010, 05:02 pm

This might be a stupid question, but how do you ground a wooden case?

You dont, Tom has said that grounding these amps is not an issue.

praedet · « **Reply #1538 on:** 10 Jun 2010, 08:35 pm »

Anyone tried the Car 12V power supply Tom offers to run it on a battery? I think I am going to so that it matches the DODD tube buffer

TrungT · « **Reply #1539 on:** 10 Jun 2010, 08:47 pm »

Praedet

$175 Class D amp--120 wpc

guest1632