O-Noorus D3 PRO - A new TPA3255 PFFB amplifier with DAC

[Audionaut]

I think this is a very interesting amplifier that will soon be on the market.
Useful features, PFFB and a decent DAC - a nice complete package. Of course, it would also be nice if an O-Noorus device like this could also be tested by ASR.

Pictures and data from the website:

1、Hardware configuration
Decoding core: AKM AK4493S DAC chip, supports PCM 768kHz / DSD512 native hardware decoding

Amplifier module: TI TPA3255 PFFB (pure feedforward feedback architecture)

Digital interface: XMOS XU316 USB audio solution, supports ultra-low latency asynchronous transmission

Bluetooth chip: Qualcomm QCC3084, compatible with aptX Lossless / LDAC / LC3 and other high-definition encodings

Tone: NJW1194 electronic volume chip, supports ±10dB bass and treble adjustment

2、Input interface
Digital input

USB (Type-B USB1: PC/mobile phone decoding; Type-A USB2: U disk direct reading)

HDMI ARC (TV audio return)

Optical fiber/coaxial (SPDIF, supports 24bit/192kHz)

Analog input

RCA (input/output multiplexing)

Wireless input

Bluetooth 5.3 (aptX Lossless transmission, delay <50ms)

3、Output interface
Main channel: stereo output

subwoofer :subwoofer interface (40-200Hz adjustable,)

RCA multiplexing: transfer to pre-stage output in non-input state (sound source sharing mode)

4、Working mode

AK4493S -> OP Amp-> NJW1194 -> OP Amp*2 -> TPA3255

F : NJW1194 Front end

B：NJW1194 Backend

D-F mode

Decoding source from NJW1194 front-end output, TPA3255 power is disconnected, tone/volume is invalid

D-B mode

Decoding source from NJW1194 back-end output, TPA3255 power disconnected, tone/volume adjustable

A-F mode

Decoding source from NJW1194 front-end output, TPA3255 power on, tone/volume invalid

A-B mode

Decoding source from NJW1194 back-end output, TPA3255 power on, tone/volume adjustable。

In short：When RCA is not used as input, it is output. As output, the sound source is mode shared.

 

[Xombul]

Assuming a price kept below 150 euros, it would be an incredible value for money. For sure Amir should test it.

 

[Xombul]

It would be nice to see in the future a version with balanced inputs and/or 2 TPA3255 chips

 

[Tristis]

I would have three questions to Mr. Lin:
- MSRP (O-Noorus website) is a public information?
- I suppose the European distributor will be Audiophonics (as usual), what would be the estimated first shipment to them?
- there is no remote control, isn't it?

I understand if some/all of my questions are sensitive business information, I will be grateful if you answer any of them.

 

[ohmywatt]

Their website sows the D4 which adds RCA inputs but deletes the AUX input https://www.o-noorus.com/products/d4
The D3 shows 2 x 300 watts at 4 ohm. I'd like to know what output would be at 8 ohm. They fail to mention output for the D4 @Alexander Lin
A review on these would be great! @amirm

 

[somebodyelse]

I would have three questions to Mr. Lin:
- MSRP (O-Noorus website) is a public information?
- I suppose the European distributor will be Audiophonics (as usual), what would be the estimated first shipment to them?
- there is no remote control, isn't it?

I understand if some/all of my questions are sensitive business information, I will be grateful if you answer any of them.

You're more likely to get a response if you tag the member, not just mention their name. @Alexander Lin

 

[ICIETDIYEUR]

Hello Tristis

I will answer your questions as best I can:

- I don't know the MSRP of the amplifier, ALEXANDER will communicate it to you.

- the distributor for Europe will probably be AUDIOPHONICS as you suggested.

- the amplifier has a remote control.

Concerning the PCB (of which I have the photos but i am not allowed to disclose them, sorry...) it is superbly made with very good selected components and its implementation is very judicious

You will see all this for yourself very soon as ALEXANDER has made the decision.

NB: the slight delay for the release of this last model is due in the first place with a supply delay concerning the display screen but also some slight last minute modifications in order to best meet the expectations that all of you express as far as possible and the very short time for this.

O-NOORUS strives to meet your many expectations, as far as their integration is possible but also to the extent of changes in components.

Do not hesitate to continue to make remarks and suggestions because they are welcome and allow you to improve but above all to better satisfy you.

See you soon

 

[sabih]

Since this amplifier is not yet released.
It is my suggestion to add volume memory feature with HDMI arc.
Or at least HDMI volume should be zero at the start instead of full volume.

Thank you.

 

[Ropeburn]

Now the obvious question: if sub out has lowpass, is there a highpass?

 

[ICIETDIYEUR]

ALEXANDER: you will also need a cigarette lighter for smokers (LOL LOL LOL)

 

[Guddu]

Concerning the PCB (of which I have the photos but i am not allowed to disclose them, sorry...) it is superbly made with very good selected components and its implementation is very judicious

like the confidence

 

[Audionaut]

Concerning the PCB (of which I have the photos but i am not allowed to disclose them, sorry...) it is superbly made with very good selected components and its implementation is very judicious

I have two questions about this:

Firstly > What exactly does this mean with regard to the PCB? For example, is it constructed in six layers, as Aiyima advertises, or are there other qualities of the PCB that qualify it as “superbly made”?

Secondly > Are you an official employee of O-Noorus who posts official information on this forum?

 

[ICIETDIYEUR]

Hello Audionaut.

If you talk about the AIYIMA A80, I see that the quality of their 6-layer PCB has clearly contributed to the 'excellent SINAD ranking' for this model (LOL)...
...but of course I'm joking to get around your question and thus not reveal anything about O-NOORUS D3 PRO as I said earlier.

Moreover, my (personal) remark about the quality of the O-NOORUS D3 PRO PCB is not important, only the future owners of this model matter, of course

That said, I am not employed by O-NOORUS: I do know ALEXANDER well with whom we maintain friendly links via the internet

That's all that's useful to know.

Regards.

PS: i live in France near Paris, ALEXANDER live in China near Shenzhen, we have a lot of fun reading the translations because I don't speak Chinese and he doesn't speak French

 

[Audionaut]

If you talk about the AIYIMA A80

No, as you can see from the picture, these are the two PCB boards of the Aiyima A70 stereo

 

[ICIETDIYEUR]

Oh yes, the less well made 'copy' by AIYIMA of the TOPPING PA7 plus amplifier

They still have the merit of having had the good idea of using a gigantic heatsink in the shape of an aluminum cube to lower the temperature but at the expense of a form factor that is generally much less appreciated by 'users'

You will tell me that 'others' do a bit the same thing with regard to the TOPPING PA5 II, which is still not as good

When we copy it's to do better or to correct the 'defects' of the original model normally...

If you ask my humble personal opinion, it's unfortunate that FOSI didn't make a new model of their FOSI V3 stereo but with the PFFB, additional XLR (or TRS) inputs with a digital volume control (using the NJW1195A chip to keep the signal balanced) and a 12 volt trigger: their amplifier would have been almost perfect

They could even call it FOSI V3 MAX as a 'nod' to AIYIMA

(That said, you'll have to wait for the release of future models from O-NOORUS: it's my little finger that tells me...)

 

[terryforsythe]

Of course, it would also be nice if an O-Noorus device like this could also be tested by ASR.

Perhaps O-Noorus would be kind enough to send one to Amir for testing. It will provide good exposure for them, and thus well worth their effort, if the unit performs well.

Another alternative, if you happen to buy one, is to send it to Amir yourself. Of course, communicate with him first to coordinate that.

 

[jooc]

I think this is a very interesting amplifier that will soon be on the market.
Useful features, PFFB and a decent DAC - a nice complete package. Of course, it would also be nice if an O-Noorus device like this could also be tested by ASR.

Pictures and data from the website:

View attachment 433741

1、Hardware configuration
Decoding core: AKM AK4493S DAC chip, supports PCM 768kHz / DSD512 native hardware decoding

Amplifier module: TI TPA3255 PFFB (pure feedforward feedback architecture)

Digital interface: XMOS XU316 USB audio solution, supports ultra-low latency asynchronous transmission

Bluetooth chip: Qualcomm QCC3084, compatible with aptX Lossless / LDAC / LC3 and other high-definition encodings

Tone: NJW1194 electronic volume chip, supports ±10dB bass and treble adjustment

2、Input interface
Digital input

USB (Type-B USB1: PC/mobile phone decoding; Type-A USB2: U disk direct reading)

HDMI ARC (TV audio return)

Optical fiber/coaxial (SPDIF, supports 24bit/192kHz)

Analog input

RCA (input/output multiplexing)

Wireless input

Bluetooth 5.3 (aptX Lossless transmission, delay <50ms)

3、Output interface
Main channel: stereo output

subwoofer :subwoofer interface (40-200Hz adjustable,)

RCA multiplexing: transfer to pre-stage output in non-input state (sound source sharing mode)

4、Working mode

AK4493S -> OP Amp-> NJW1194 -> OP Amp*2 -> TPA3255

F : NJW1194 Front end

B：NJW1194 Backend

D-F mode

Decoding source from NJW1194 front-end output, TPA3255 power is disconnected, tone/volume is invalid

D-B mode

Decoding source from NJW1194 back-end output, TPA3255 power disconnected, tone/volume adjustable

A-F mode

Decoding source from NJW1194 front-end output, TPA3255 power on, tone/volume invalid

A-B mode

Decoding source from NJW1194 back-end output, TPA3255 power on, tone/volume adjustable。

In short：When RCA is not used as input, it is output. As output, the sound source is mode shared.

View attachment 433739


View attachment 433740

Certainly has all the buzzword specs and a lot of inputs packed close together, why do I worry about dependability?

 

[Alexander Lin]

Since this amplifier is not yet released.
It is my suggestion to add volume memory feature with HDMI arc.
Or at least HDMI volume should be zero at the start instead of full volume.

Thank you.

What is your TV model? We tested some TV models and found that the volume does not reach the maximum value when restarting. This may be a compatibility issue. Also, do not adjust the volume of D4 to the maximum value, but adjust it to the middle value and use the TV remote control to control the volume.

 

[Alexander Lin]

Now the obvious question: if sub out has lowpass, is there a highpass?

D3 PRO No high-pass filter。

 

[Alexander Lin]

Perhaps O-Noorus would be kind enough to send one to Amir for testing. It will provide good exposure for them, and thus well worth their effort, if the unit performs well.

Another alternative, if you happen to buy one, is to send it to Amir yourself. Of course, communicate with him first to coordinate that.

We are ready, I will be.