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

[Douk Audio]

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?

Hello, thank you for your attention!
This power amplifier is class D, with higher efficiency than class AB amplifier.
As for the data, we cannot provide now since the final version hasn't been determined yet. And I will post it when the data is measured.
Stay tuned.

 

[Douk Audio]

Subwoofer out could also be nice for the very many active subs that are on the market now.

After internal discussion at PD, they decided not to add the subwoofer output.

 

[Douk Audio]

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

Hello, thank you for your attention and opinions!
Yeah,
it adopts internal switching power supply, adaptive mode, no switching required.
With trigger input function, it can be used with the preamplifier to achieve automatic power on and off following the preamplifier
Besides bass and treble bypass, also with volume bypass!

 

[Douk Audio]

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

Hi, thank you for your attention!
When clipping occurs, the amplifier will protect itself and the LED on the panel will flash.

 

[Douk Audio]

Bass management -- adjustable high and low pass filters.

I am sorry, our PD decided not to add the subwoofer out and the adjustable high and low pass filters after their internal discussion.

 

[Douk Audio]

Will it be 4xBTL outputs or 2xPBTL?

Hi, it will be 2xPBTL.

What DSP chip do you plan to use? Could you make a USB config interface available for hackers?

NJW1194 for EQ function，won't support USB input.

Will you make digital inputs available?

No digital inputs, only with analog inputs to match CD players, Preamps, DAC etc.

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

Yeah, it will wieh 12V trigger input.

 

[Douk Audio]

Or is there no digital signal processing?

I am sorry, there will be no digital signal processing.

 

[Douk Audio]

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.

This amplifier mainly designed for dual-channel high-power output, which is convenient for comparing different speakers. Won't add the subwoofer output.

 

[Douk Audio]

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.

The estimated price will be around $280.

Since the chassis limited, the distance between two VU meters won't be easily changed.

The low level signal input near mains AC, no worries, our engineers will consider this.

 

[Douk Audio]

That reads very well.
DSP with PEQ?

Keep it up, you're doing very good work

Hi, it will support treble and bass control of +/-10dB adjustment range.

 

[Douk Audio]

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.

Hi, thank you for your attention. This amplifier adopts pure mechanical meter, used to indicate the current music level, three-speed automatic sensitivity adjustment, can achieve small signal and large signal state, the VU meter has a suitable swing.

 

[Douk Audio]

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

Thank you for your attention! When clipping, overcurrent or overheating occurs, the machine will automatically protect itself, and the LED light on the panel will flash. After the protection is released, the machine will automatically resume output.

 

[Douk Audio]

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?

Hi, thank you for your attention.
It with main volume control knob and a remote volume control
The 4 RCA terminals are two-way stereo inputs, convenient for users to connect multiple audio source devices.

 

[Douk Audio]

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

Hi, thank you for your attention.
Around 200W output at 1% THD.
NJW1194 for treble and bass, also support bypass function.
No high-pass filter and sub-out.

 

[Matt_Holland]

Hi, thank you for your attention.
Around 200W output at 1% THD.
NJW1194 for treble and bass, also support bypass function.
No high-pass filter and sub-out.

Is there really a customer demand for such simple tone controls? Surely EQ is a pre-amp function and most users will have a pre-amp and/or source with this.
Similarly, why is there a volume control?
Just make a nice looking power amplifier (VU meters are a big selling point) with built in power supply (another big selling point) and plenty of power. We don’t need DSP in power amplifiers.

 

[Audionaut]

Is there really a customer demand for such simple tone controls? We don’t need DSP in power amplifiers.

Who is we?
I would very much welcome these features that the amplifier has to offer. This makes it an integrated amplifier, not just a power amplifier.

 

[Zek]

Maybe you could implement a balance control (left to right) like in old integrated amplifiers.

 

[Thomas_A]

So this is a 4-channel amp? What is the predicted spec using four channels 4/8 ohm?

 

[sergeauckland]

Hi, thank you for your attention. This amplifier adopts pure mechanical meter, used to indicate the current music level, three-speed automatic sensitivity adjustment, can achieve small signal and large signal state, the VU meter has a suitable swing.

Thank you for your reply. If I've understood it correctly, the meters are there just for show, and won't be indicating anything useful. What we call in the UK "A Mug's Eyeful."

It may help sell more boxes on looks, but misses an opportunity for metering to be meaningful, not just pretty. Disappointing.

S.

 

[Audionaut]

So this is a 4-channel amp? What is the predicted spec using four channels 4/8 ohm?

I think you will get two channels, not four

What we call in the UK "A Mug's Eyeful."
It may help sell more boxes on looks, but misses an opportunity for metering to be meaningful, not just pretty. Disappointing.

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The others...