Want a TPA3255 Amplifier with a Built-in Power Supply? It is coming!

[Douk Audio]

Hello ASR members,

Hope all of you had a great weekend!

Recently, we are going to launch another digital amplifier with dual TPA3255 chips and a built-in power supply.
Below are details about it; its final version hasn't been decided yet. Please share your opinions and shape it together! We welcome all suggestions, thank you!

Specs
Audio input: 2 groups of RCA; XLR
Audio output: 2 groups of banana speaker jacks
Number of channels: 4-channel / 2-channel power output
Max. power output: 300W*2 (4 ohms, THD10%)
THD+N: 0.007%
SNR: ≥110dB
Frequency response range: 20Hz-20kHz (±0.5dB)
Input voltage: AC100-230V

Highlights
1. A/B two groups of banana speaker jacks, connect two pairs of speakers at the same time, and are easy to switch.
2. With 3 groups of audio inputs, 2*RCA and 1*XLR, easy to switch.
3. With a built-in 600W power supply, no need to upgrade the external power.
4. With built-in DSP, support treble and bass control, also support bypass function.
5. Customized large VU meters.
6. Support remote control, easy to switch from a distance.
7. With dual TPA3255 amp chips.

 

[mcdn]

Looks great!

Will it be 4xBTL outputs or 2xPBTL?
What DSP chip do you plan to use? Could you make a USB config interface available for hackers?
Will you make digital inputs available?

Also it will idle quite hot. Any plans for trigger input or auto-on?

 

[olieb]

4. With built-in DSP, support treble and bass control, also support bypass function.
5. Customized large VU meters.

Built in power is great! DSP would be cool, but then there should be digital inputs and USB to program it. There should be a bypass too (for analog input). Or is there no digital signal processing?
I could do VERY well without VU (and tone controls).

 

[Jeromeof]

Looks cool - yes a usb input both as a DAC and for configuration of the DSP chip). Ideally something like USB-HID interface to allow easily pushing / pulling the DSP filters would be great. Possible a Subwoofer output might also be an enhancement.

 

[Hiten]

Estimated price ?

Two vu meter close to each other (like traditional amps) may give better idea about two channel levels.

Low level signal input near mains AC input can be avoided.

 

[Audionaut]

3. With a built-in 600W power supply, no need to upgrade the external power.
4. With built-in DSP, support treble and bass control, also support bypass function.
5. Customized large VU meters.
6. Support remote control, easy to switch from a distance.
7. With dual TPA3255 amp chips.

That reads very well.
DSP with PEQ?

Keep it up, you're doing very good work

 

[sergeauckland]

Presumably the VU meters are electronic rather than physical moving-coil meters. On that basis, there should be the option of VU or True-Peak ballistics as for a power amp, the peak level is what's important rather than the average power, which is more or less what a VU meter shows.

If the meters really are moving coil, then Quasi-peak with a 1 or 2mS integration time should be offered, as again, VU meters tell you nothing useful in a power amp.

S.

 

[Hiten]

I agree. Unnecessary increase in cost. A clipping indicator led (if needed at all) will be sufficient.
Regds.

 

[MCH]

IMO now that we have plenty of very small, powerful and cheap TPA amps, a multichannel amplifier makes sense only if it has a master volume control and ideally remote control.
Many people will be asking why only two balanced inputs, as in most (all?) use cases the signals will come from the same device. Because you are not planning that xlr is for stereo only and RCA for 4 channel only, are you?

 

[JeremyFife]

Could do with a more complete specification
What is the power at 1%THD?
Analogue inputs, but also with DSP - that implies you are digitising the input - any details?
A recent, and welcome, feature of new amps has been the inclusion of a high-pass filter and a sub-out. Given that you include DSP, is that in your thinking?

Looking forward to hearing more and to seeing the measurements

 

[PatentLawyer]

Bass management -- adjustable high and low pass filters.

 

[LtMandella]

DSP AWESOME!
balanced inputs, vu meter/clipping indicator/internal power supply GREAT!
I am sold!

 

[Scrivs]

Hey! Dookie to the rescue!

 

[Guddu]

Hello ASR members,

Hope all of you had a great weekend!

Recently, we are going to launch another digital amplifier with dual TPA3255 chips and a built-in power supply.
Below are details about it; its final version hasn't been decided yet. Please share your opinions and shape it together! We welcome all suggestions, thank you!

Specs
Audio input: 2 groups of RCA; XLR
Audio output: 2 groups of banana speaker jacks
Number of channels: 4-channel / 2-channel power output
Max. power output: 300W*2 (4 ohms, THD10%)
THD+N: 0.007%
SNR: ≥110dB
Frequency response range: 20Hz-20kHz (±0.5dB)
Input voltage: AC100-230V

Highlights
1. A/B two groups of banana speaker jacks, connect two pairs of speakers at the same time, and are easy to switch.
2. With 3 groups of audio inputs, 2*RCA and 1*XLR, easy to switch.
3. With a built-in 600W power supply, no need to upgrade the external power.
4. With built-in DSP, support treble and bass control, also support bypass function.
5. Customized large VU meters.
6. Support remote control, easy to switch from a distance.
7. With dual TPA3255 amp chips.

View attachment 442606
View attachment 442607

Looks quite good already.
These might be worth a thought:
- Basics like power on/off toggle, input selector etc. could help in user experience than Potentiometers for these operations.
- Auto ON/Off
- Bypass for Volume as well, not just bass/treble

 

[sceptical1]

This looks like everything I would need to finally ditch my 30 yr. old integrated and move to 21st century technology. I do have a few questions.
My current amplifier is only 60w/@8R, 100w @4R and I need more power for the speakers I use 83db/1w/4R. That rated output is at less than .005% thd. from 20-20khz. Yes, 20khz, for some reason they cared about it in the old days.

The thing is this amp has a linear supply and can produce peak outputs (100ms) of 170w@4R and 280w@2R. It will deliver somewhat less power at 1 ohm than 2 even though the transformers are hardly what I would consider beefy.

The question is, can your rated 300w/4R@10% thd. amplifier play my speakers louder with less distortion vs the amp I have or should I just stick to buying a higher powered class ab amp with a linear supply?

Also, what is the efficiency of your amplifier when producing a 1w steady state output?

 

[Jimster480]

I would say this looks quite good. No USB or Optical is needed. Make a mode for volume bypass (for those of us with DAC's that are preamps) for max performance.

Dual channel looks great, make sure that it can operate on signal input (like Fosi v3 Mono Block) where it will go into hibernate/sleep until it detects audio on the line. I guess this is auto On/Off. Some people might want 12V Trigger also.
Subwoofer out could also be nice for the very many active subs that are on the market now.
Otherwise if the price is reasonable, I will likely purchase one!

 

[Audionaut]

Hello @Douk Audio
How far along are the plans to realize this interesting project?
What else would you like to know so that you can get started with the actual implementation?

 

[Douk Audio]

Hello, thank you very much for your attention. I have collected your questions and suggestions last week. Today, my colleagues from the PD team have sent them back to me. Now let me answer them one by one.

 

[Douk Audio]

Hello @Douk Audio
How far along are the plans to realize this interesting project?
What else would you like to know so that you can get started with the actual implementation?

Hello, thank you for your attention! The product functions are still under discussion. It is expected that the final version will be determined in May and mass production will be completed before July. Before the final version confirmed, all suggestions are welcome!

 

[Douk Audio]

I would say this looks quite good. No USB or Optical is needed. Make a mode for volume bypass (for those of us with DAC's that are preamps) for max performance.

Dual channel looks great, make sure that it can operate on signal input (like Fosi v3 Mono Block) where it will go into hibernate/sleep until it detects audio on the line. I guess this is auto On/Off. Some people might want 12V Trigger also.
Subwoofer out could also be nice for the very many active subs that are on the market now.
Otherwise if the price is reasonable, I will likely purchase one!

Thank you for your attention!
Yes, our PD decided to add volume bypass function!
No signal detect function but with 12V trigger.