Douk Audio TPA3255 Amplifier with HPF is Coming! Let's Shape it Together!

[Franzois]

Ha, very nice thread! I am also on the market for a good class D amp with HPF.

In my book, a product I would buy should have:

- selectable main range high pass filter from 40 to 150 Hz to remove the LF load on the main speakers.
- unfiltered sub out is sufficient since most (all?) active subwoofers in the market have a tunable low pass filter.
- 48V 5A standard PSU.

Good perfs, similar to fosi V3, with PFFB load independance at the same price.

Personnaly, I don't want balanced inputs, swappable op amps and other frills as it just adds costs for very little benefits.

 

[SMen]

If you are going to add a variable filter, add an additional volume control for the subwoofer - not expensive and the combination will save users the joy of grappling around on their hands and knees trying to find the dials behind their subwoofers to adjust ... or a remote control for icing on the cake ...

balanced a good idea with these chips ... finding niches in this increasingly sophisticated product market the way to go ...

and yes ... 150 hz or 250 hz absolute max ... that is the point of a subwoofer...

PS - buy without power supply option too a good idea.

 

[Guddu]

Douk Audio - A5 - looks beautiful
Congrats @Douk Audio

PE:
But…. You have got high pass filter now.. then
- why not proper sub-out than aux-out?
- why not some more frequency marketings on HPF knob?
- no balanced input, no volume bypass but that’s all right for the price… I guess

 

[surroundman]

I am very happy that they are releasing this product! I may soon buy one to replace my Fosi V3. But I do agree that volume bypass and sub-out controlled by the volume knob is much more desirable.

 

[JSmith]

Why are so many companies using A5 as model numbers? We have PA5 from Topping, A5 from 3e and now A5 from Douk.

Plus Audioengine A5 speakers.


JSmith

 

[V.b.]

Douk Audio - A5 - looks beautiful
Congrats @Douk Audio

View attachment 423097
View attachment 423099

PE:
But…. You have got high pass filter now.. then
- why not proper sub-out than aux-out?
- why not some more frequency marketings on HPF knob?
- no balanced input, no volume bypass but that’s all right for the price… I guess

The whole point about HPF in an amplifier is using a stereo signal for speakers with sub (subs) and keep them volume matched.

And having a jack will allow you to use stereo subs or use a mono jack for a single sub.

Nice product, everything you need if you don't go with a DSP, sub or not.

V

 

[Franzois]

Douk Audio - A5 - looks beautiful
Congrats @Douk Audio

View attachment 423097
View attachment 423099

PE:
But…. You have got high pass filter now.. then
- why not proper sub-out than aux-out?
- why not some more frequency marketings on HPF knob?
- no balanced input, no volume bypass but that’s all right for the price… I guess

First, thank for the heads up, I never expected this product to come out that soon! I agree that the markings could be better. In particular markings on the HPF knob are important in the 60-80-100Hz region since the sub is going to have the same markings.

I suppose that the "aux-out" means "full range". If you mean You would have liked a filtered sub out, I disagree. First, all active subs have a built in LPF filter, and the non-filtered out makes it usable for other things.

This product looks very appealing to me: it looks like an improved fosi V3 in all respects: PFFB included, distortion seems similar or better, the main amp is filtered when using a sub and pricing is fine.

 

[EJ3]

First, thank for the heads up, I never expected this product to come out that soon! I agree that the markings could be better. In particular markings on the HPF knob are important in the 60-80-100Hz region since the sub is going to have the same markings.

I suppose that the "aux-out" means "full range". If you mean You would have liked a filtered sub out, I disagree. First, all active subs have a built in LPF filter, and the non-filtered out makes it usable for other things.

This product looks very appealing to me: it looks like an improved fosi V3 in all respects: PFFB included, distortion seems similar or better, the main amp is filtered when using a sub and pricing is fine.

Not everyone uses active subs:
my 2 passive subs are built by me, the raw speaker's FR is 20Hz to 80Hz and the CAB is port tuned to 29Hz.
HPF seems to be just fine for this, as the signal will be sent to my sub amps.
Not sure why they would want a "filtered sub out"?
AUX-OUT typically means full range (I have never seen otherwise).
On the other hand, I think that a well marked (perhaps even 3 detents) 60-80-100 markings would be nice.

 

[Guddu]

I suppose that the "aux-out" means "full range". If you mean You would have liked a filtered sub out, I disagree.

I simply meant sub out, as in RCA type plugs rather than 3.5mm aux.

PS. I said it already that it’s totally worth checking out at this price.
The comments are simply to give some feedback.

 

[MCH]

89$ shipped and -10% if new customer? If this thing works half well, it is going to leave the concurrence in a difficult position...

 

[RikudouGoku]

I ordered this a week or so ago. Missed that new customer deal though...

Here is the manual that I had to contact their customer support for. The high pass filter only works for the speaker out connectors and not the AUX (I asked to make sure).

 

[surroundman]

I too ordered one last night. But I really do need auto on/off and a volume bypass features ... I can't wait for these companies to release a product that will feature HPF+auto on/off+volume bypass all together.
Still, happy to replace my Fosi V3 with this amp here. The HPF makes it a straight upgrade.

 

[EJ3]

The high pass filter only works for the speaker out connectors and not the AUX (I asked to make sure).

I am curious:
I have never heard of an AUX that is not just the straight through signal.
Exactly as I would expect for both an AUX in or out.
Due to that, it's certainly not a question I would have considered asking.
Is it a question that I should be asking?
Have you heard of an AUX that any filters act on?
And if so, what unit(s)?

 

[EJ3]

Hi,

Also, how safe is a 300W amp where you can just open a lid?

I am curious as what one would do to make that not safe?
I guess that I don't have a use case that I can think of for which that would be unsafe.

 

[EJ3]

No easy open lid, dangerous.

I am serious: How (in what way) is that dangerous?
It's covered until intentionally removed, right?

 

[EJ3]

If you are going to add a variable filter, add an additional volume control for the subwoofer - not expensive and the combination will save users the joy of grappling around on their hands and knees trying to find the dials behind their subwoofers to adjust ... or a remote control for icing on the cake ...

balanced a good idea with these chips ... finding niches in this increasingly sophisticated product market the way to go ...

and yes ... 150 hz or 250 hz absolute max ... that is the point of a subwoofer...

PS - buy without power supply option too a good idea.

I may be wrong but I'm thinking that not that many that buy the amps at this price level are people that are also looking for "balanced"?
On everything else, I'm with you 100%.

 

[RikudouGoku]

I too ordered one last night. But I really do need auto on/off and a volume bypass features ... I can't wait for these companies to release a product that will feature HPF+auto on/off+volume bypass all together.
Still, happy to replace my Fosi V3 with this amp here. The HPF makes it a straight upgrade.

Auto on/off, perhaps you can get something like that via a smart plug (Tuya and Home Assistant) that automatically turns off it when you are sleeping or out.

I have never heard of an AUX that is not just the straight through signal.
Exactly as I would expect for both an AUX in or out.
Due to that, it's certainly not a question I would have considered asking.
Is it a question that I should be asking?
Have you heard of an AUX that any filters act on?

No, I am not aware of any like that but I am far from an expert in sources and I wanted to be 100% sure it would work for my purpose before I pulled the trigger. (Although I forgot to ask what type of power plug it comes with...)

 

[EJ3]

Auto on/off, perhaps you can get something like that via a smart plug (Tuya and Home Assistant) that automatically turns off it when you are sleeping or out.



No, I am not aware of any like that but I am far from an expert in sources and I wanted to be 100% sure it would work for my purpose before I pulled the trigger. (Although I forgot to ask what type of power plug it comes with...)

Hopefully the power plug will be the one for your country. Many of todays power supplies will run on various voltages and as long as they are not tied to certain cycles for timing purposes, all that is needed is a plug adapter. But it's easier (and less cluttered) if you're sure that your getting the correct setup to begin with.
I'll have to remember to start asking that when I am ordering something from outside of my country that requires being plugged in to electrical power.

 

[RikudouGoku]

Hopefully the power plug will be the one for your country. Many of todays power supplies will run on various voltages and as long as they are not tied to certain cycles for timing purposes, all that is needed is a plug adapter. But it's easier (and less cluttered) if you're sure that your getting the correct setup to begin with.
I'll have to remember to start asking that when I am ordering something from outside of my country that requires being plugged in to electrical power.

Yeah, hopefully they send the correct version based on your shipping address. I havent had any issues with other electronics from China though such as my Topping E30. (not sure if China use the same plug as Sweden does.)

 

[EJ3]

Yeah, hopefully they send the correct version based on your shipping address. I haven't had any issues with other electronics from China though such as my Topping E30. (not sure if China use the same plug as Sweden does.)

I thought that some of the plugs that I have seen in China are the same as the ones from my born country, Austria (I live in the USA [my wife is Chinese]).
In checking, I find that there are some that are the same (sort of, maybe) & some that are different:
In China, they use power sockets (outlets) of type A, C and I. In Sweden, you have plugs C and F. You need a power plug adapter in China for sockets type A and I. Sockets type C can fit your plugs, but may not always be available locally. I'll just use the ones that my wife has in her condo when we are there.

A

C

F


Socket type A does not fit your plugs C and F

C

C

F


Socket type C fits your plugs

I

C

F


Socket type I does not fit your plugs C and F

• Plugs F fit into sockets type C, but lack grounding.