O-NOORUS D4 budget stereo amp review

[LtMandella]

I have a question for Americans.... With Trump's new policy on import taxes from Chinese and European countries, won't it slow down purchases via Aliexpress and others? We're talking about a 25% increase

I am still ordering stuffed amp and preamp boards from Ali as of today. But then again I haven't seen any consequences yet to my purchases from the tariffs. So will have to see how onerous - if there are any for individual small retail purchases.
And I feel there is a good chance Tramp will cave on the tariffs very soon and therefore there will be no significant affect on my purchases, and this is mostly a market manipulation scam on his part, for his billionaire pals.

 

[capslock]

Hello Dany

Everyone seems to agree that the measurements on current devices are no longer audible.

Can we still talk about listening (necessarily subjective) when the devices don't have any perceptible differences ?

I don't know, but even reputable companies like TOPPING or SMSL offer settings on their DACs to obtain different 'sound signatures,' even though we probably shouldn't hear them since they use the same circuits but with different harmonics that we shouldn't hear ?

Personally, I haven't tested this type of DAC yet, so could anyone who owns one say whether they perceive any differences or not ?

What explanation could these companies provide if, however, differences were indeed audible ?
Are they hiding something new from us in terms of listening that they have discovered and measured (proven) ?

Given what is currently known, I have no personal answer to offer...

- 67 dB 3rd harmonic is audible in my experience.

If you don't use the DAC, you get - 80 dB which may be inaudible (in my experience, it may still make for a tired sound), but if you don't need a DAC, buy a D1 which has much lower distortion.

 

[mcdn]

Am I missing someone in this thread?... Anyways, thanks for the measurements, just wanted to ask, is the dummy load used your smd one? If yes, how did it go?

Oh, yeah, that thing is a tank! Obviously it wasn’t stressed at all by this amp. I’ve added active fan control recently, I’ll post an update soon

 

[mcdn]

Although SINAD is not very good, according to the feedback from 90% of users, D4 sounds excellent and has strong musicality.

That was my conclusion. It may not measure the best in class but it has great I/O and will be as good as any other amp in its intended use for desktop or small rooms

 

[mcdn]

- 67 dB 3rd harmonic is audible in my experience.

If you don't use the DAC, you get - 80 dB which may be inaudible (in my experience, it may still make for a tired sound), but if you don't need a DAC, buy a D1 which has much lower distortion.

Evidence needed please.

 

[mcdn]

Agreed.

For me,.. from now on PFFB does not matter and is a waste of money. Since subjectively non-pffb amplifiers are sounding better to my ears.
Just buy any lowest price TPA3255 amplifier and connect it to high quality DAC and you're good to go.

That’s not a very well justified conclusion. PFFB gives lower distortion and better FR in return for slightly lower gain. Almost all 3255 modules use it now.

 

[Alexander Lin]

That’s not a very well justified conclusion. PFFB gives lower distortion and better FR in return for slightly lower gain. Almost all 3255 modules use it now.

There may be EQ in the digital input part, which is designed by a third party. The EQ causes the SINAD to be low. We have obtained the source code and are trying to remove the EQ and then test the digital part.

 

[mcdn]

There may be EQ in the digital input part, which is designed by a third party. The EQ causes the SINAD to be low. We have obtained the source code and are trying to remove the EQ and then test the digital part.

That would be a great result, the power section does seem to be let down a bit by the front end.

To remind people, the 1kHz 5W dashboard SINAD is still a totally transparent 78.5dB and would be in the green section of Amir's master amp list. Yes, other TPA3255 implementations do better, but the overall package is still good value so long as you understand what it offers.

 

[sabih]

There may be EQ in the digital input part, which is designed by a third party. The EQ causes the SINAD to be low. We have obtained the source code and are trying to remove the EQ and then test the digital part.

When can we expect new firmware of this amplifier?