Another TPA3255 Amplifier is Coming? Douk Audio A100 Mono/Stereo Amplifier!

[Douk Audio]

How does this product compare to any other product on the market?

We will invite some professional reviewers to test it when the A100 is released. Let us wait for their comments together.

 

[Eleo]

We will invite some professional reviewers to test it when the A100 is released. Let us wait for their comments together.

I hope they will provide objective measurements, not subjective nonsense.

 

[Douk Audio]

I appreciate very much you sharing measurements, but again, you need to post the test conditions otherwise these numbers don't mean much. Don't take it wrong, I am just trying to help.
At which load %THD and voltage have you measured 300W in mono mode?
The tpa3255 can indeed output 300W, and even more, but with the same 51V 4ohm that your other measurements were taken.... Hmmmm you are at the very limit, unless you are using now 2 ohm or we are talking 10%THD. Test conditions are everything!!
View attachment 377596

Hi, thank you for your reply. When using the default DC48V/5A power adapter, below is the test our engineer sent.
Mono mode: in 1Khz, the load is 4 ohm and the THD is 8.985%, we measured 301W.
Stereo mode: in 1Khz, the load is 4 ohm and the THD is 9.804%, we measured 175W in each channel.

 

[Douk Audio]

+1

@Douk Audio
It would be meaningful as long as you are specifying test conditions, equipments and parameters.
More to it, best if you do make the psu available as an option for maximum output, like 51v here.

Hi, thank you for your advice. Below is the test when input 51V

 

[Guddu]

Hi, thank you for your advice. Below is the test when input 51V
View attachment 378930
View attachment 378931

This is certainly very cool.
If it’s not trouble for you to get:
1) Case temperature on 300W output for at least 60sec. or more?
2) What’s the maximum output on 1% THD?
3) Frequency response comparison @4ohm vs 8ohm load?

 

[GoDawgs]

A power amp should turn itself ON/OFF with the source component - needs 12V trigger (opto isolated to prevent ground loop) also (ideally) auto signal sense on/off (and make certain no POP when comes on/off)
No front volume controls wanted!!!! The source component handles this, I do NOT want that on my power amp
Your Aux-out function (stereo? really?!?) makes no sense! Either:
- Please just Delete this entirely
- or, MUCH less desirable: make this a proper 2.1, which means LFE (mono RCA!!!) sub out (possibly with adj frequency? but most active subs would have this built in so probably not needed/wanted in the amp) AND MUST HAVE high pass filter for the main output (definitely need adj freq for this)

You seem to have already decided this is not your dream amp, instead of demanding and ordering them to make you a custom amp, why don't you go shopping for something else? We already have enough official complainers here.

they should share complete test conditions or shut up

If you are not satisfied with this amp offering, don't buy it, but don't tell other people to shut up for not doing what you want. Just because you're posting on the internet you do not get to stuff your manners into your underwear, grow up!

 

[Douk Audio]

So it's not on sale?

Hi, the A100 is expected to release in mid-July, thank you for your attention!

 

[Guddu]

This is certainly very cool.
If it’s not trouble for you to get:
1) Case temperature on 300W output for at least 60sec. or more?
2) What’s the maximum output on 1% THD?
3) Frequency response comparison @4ohm vs 8ohm load?

@Douk Audio
Any possibility?

 

[Douk Audio]

@Douk Audio
Any possibility?

Hi, of course, the reason why I didn't reply is because I sent these questions to our PD last week and am waiting for their results.
Today they sent me their test.

1) Under the condition of mono-channel continuous 300W (4 ohms) output, the A100 worked for 33 minutes, the power attenuation did not exceed 1W and the surface temperature was 39℃, and the test was finally terminated due to overheating of the load.
2) On 1%THD, the maximum output is 183W under 4ohm, using the default DC48V/5A power adapter. Please see the first pitcure.
3) Frequency response comparison @4ohm vs 8ohm load, please see the second picture.

 

[Guddu]

Hi, of course, the reason why I didn't reply is because I sent these questions to our PD last week and am waiting for their results.
Today they sent me their test.

1) Under the condition of mono-channel continuous 300W (4 ohms) output, the A100 worked for 33 minutes, the power attenuation did not exceed 1W and the surface temperature was 39℃, and the test was finally terminated due to overheating of the load.
2) On 1%THD, the maximum output is 183W under 4ohm, using the default DC48V/5A power adapter. Please see the first pitcure.
3) Frequency response comparison @4ohm vs 8ohm load, please see the second picture.
View attachment 379946
View attachment 379947

Thanks @Douk Audio, it's good info.

 

[DanielT]

Here is a video where FR and distortion levels are tested. The FR on the filter on the sub out is tested. John seems to have new software for his measuring equipment so the video is a bit of a test run with it. Because of that, perhaps one should take the results with a grain of salt? You, who are more knowledgeable in measurement, can decide on that.

Sub out:

 

[MCH]

Here is a video where FR and distortion levels are tested. The FR on the filter on the sub out is tested. John seems to have new software for his measuring equipment so the video is a bit of a test run with it. Because of that, perhaps one should take the results with a grain of salt? You, who are more knowledgeable in measurement, can decide on that.

Sub out:
View attachment 385334
View attachment 385335View attachment 385336

So they have all those chunky fins on the top.... And they volt the chip to the bottom?? Interesting....

 

[Guddu]

So they have all those chunky fins on the top.... And they volt the chip to the bottom?? Interesting....

It is interesting indeed…. because this thing isn’t getting even warn on playing very loud.
I got A100 yesterday, need to spend more time on it but A100 is making Ascend Acoustics Sierra-lx pumping bass superbly.
At this stage, my Fosi v3 mono runs hot and Aiyima A70 on warmer side but this A100 isn’t even warm.
Whatever they did with it, it’s working.

P.E. The case work is super solid, like build for DIY class A amplifiers I have owned long back.
Case has brushed aluminum kind of finishing.
Don’t know if my pic could justify it but it looks very nice up close.

 

[Guddu]

The box also contained nice laminated user manual with loads of information, including some measurements:

 

[Guddu]

If you like more information on A100 from user prospective, might be helpful:

Douk Audio A100 [TPA3255 PFFB Mono/Stereo] - User Impressions | Owner's Thread

Dear FMs, Douk Audio posted a thread about this A100 amplifier HERE sometime back and they shared loads of information with internal pics, measurements like SINAD and power output. I have recently got Douk Audio A100 amplifier, as I continue with my enthusiasm to explore TPA3255 chip...

audiosciencereview.com

 

[Bruce Morgen]

Douk Audio A100 TPA3255 Digital Power Amplifier Mono/Stereo Bass Audio Amp 300W on eBay for $163.99 (USD).

 

[boxerfan88]

He says Douk sounds better…

 

[Guddu]

He says Douk sounds better…

+1

But also, he didn’t realize that he is comparing a PFFB ckt amplifier with non-PFFB amplifier.

 

[Wolf11Man]

As long as you do not compare these TPA3255 amps A-B, level matched to less than 0.5 dB, this is only fact free entertainment.
Sure, we all want to be entertained, but don't take the "Dough is better than Aiyima and Fosi" serious and spent your money on such subjective talk.
The cause why people want to get around doing A-B testing, are the often extremely disapointing audible results.

 

[Guddu]

As long as you do not compare these TPA3255 amps A-B, level matched to less than 0.5 dB, this is only fact free entertainment.
Sure, we all want to be entertained, but don't take the "Dough is better than Aiyima and Fosi" serious and spent your money on such subjective talk.
The cause why people want to get around doing A-B testing, are the often extremely disapointing audible results.

+1, no one knows if he level matched or not or other parameters.
But you know that Douk A100 has PFFB topology and better heat dissipation seeing its caseworker, which is technical advantage over Fosi v3.
PE. +additional used cases with its additional features.