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

[daniboun]

I don't understand what it means. Is it a short-circuited OP-AMP buffer?

It is just a bypass OP amp (to bypass the buffer)

 

[Alexander Lin]

It is just a bypass OP amp (to bypass the buffer)

AK4493 output is converted to single-ended. Or reserve a differential socket before converting to single-ended.

 

[river road]

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

I couldn't agree more! O-noorus' products need to undergo rigorous testing! Their new Hi-Fi device is poised to become the holy grail of the cost-performance ratio.

 

[Guddu]

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

I couldn't agree more! O-noorus' products need to undergo rigorous testing! Their new Hi-Fi device is poised to become the holy grail of the cost-performance ratio.

Sure.

I always find it funny that many are ready to pay way more to WiiM, Topping, etc. for something similar but want equally good product for almost 50% less from O-Noorus.

P.S. Not pointing out anyone specific, just commenting on those many generic posts in relation.

 

[Totemis]

Good offer, there will be a discount.



USB2 5V output。


The display panel is already there, we are doing the final test.



I don't understand what it means. Is it a short-circuited OP-AMP buffer?


DAC power supply is a separate LDO independent power supply, will not be affected by USB power supply

Great for Usb-C 5v output ! If i can abuse... does one of your USB of the D3 pro usb-C input accept to bypass your AKM AK4493S DAC chip with analog or/and coaxial digital input from the Hiby R6III DAP (for example). Better to have on the same USB-C the 5V output and the possibility to bypass your Dac chip ! only one cable. Thanks.

 

[ICIETDIYEUR]

Hello Totemis

You are an extremely demanding user, but that's very good because it leads manufacturers to push their thinking even further

However, if I may say so, your request seems to me to be extremely 'confusing' and I don't really understand what you are expecting ?

Maybe you or another member could try to be more specific, please ?

Regards.

NB: if I manage to understand your expectations well, I will 'transcribe' them to ALEXANDER directly since we are used to talking together and have finally managed to understand each other despite the 'barrier' of our respective languages

PS: ALEXANDER sent me a rather convincing video of O-NOORUS D3 PRO as he finishes the test phases, it seemed very convincing and dynamic to me but it's entirely subjective and it's not live: just to tell you that I think the release of O-NOORUS D3 PRO is imminent

 

[Bamish]

Great for Usb-C 5v output ! If i can abuse... does one of your USB of the D3 pro usb-C input accept to bypass your AKM AK4493S DAC chip with analog or/and coaxial digital input from the Hiby R6III DAP (for example). Better to have on the same USB-C the 5V output and the possibility to bypass your Dac chip ! only one cable. Thanks.

Not sure on your specific DAP, but usually it is digital out from the USB C using a USB cable or USB to coax cable. So to engage the Hiby's DAC you run it in line out mode from either the 3.5 or 4.4 jack to the amps analogue inputs.

 

[daniboun]

Great for Usb-C 5v output ! If i can abuse... does one of your USB of the D3 pro usb-C input accept to bypass your AKM AK4493S DAC chip with analog or/and coaxial digital input from the Hiby R6III DAP (for example). Better to have on the same USB-C the 5V output and the possibility to bypass your Dac chip ! only one cable. Thanks.

Bypassing the DAC means erasing the very essence of a "power DAC" in which case I would fall back on a "power amp" like the X30Z (TPA3255) which has a USB C input.

 

[ICIETDIYEUR]

I agree with daniboun

It's just a shame that BRZHIFI is a bit 'behind' technically and in terms of design because they offer very good prices

 

[KL....]

Bypassing the DAC means erasing the very essence of a "power DAC" in which case I would fall back on a "power amp" like the X30Z (TPA3255) which has a USB C input.

Thank you, appears to be a (even very) fabulous (Integrated) alternative, doesn't it :=)

I agree with daniboun

It's just a shame that BRZHIFI is a bit 'behind' technically and in terms of design because they offer very good prices

Thank you, it appears (no Topology/specs, as yet) that the O-Noorus D3 PRO - A new TPA3255 PFFB amplifier with DAC will be a fabulous Power DAC, perhaps/possibly even an Integrated Power DAC.... we shall know soon/imminently. Often, patience and quality go 'hand in hand', don't they? but often, 'haste makes waste', doesn't it? :=)

PS: ALEXANDER sent me a rather convincing video of O-NOORUS D3 PRO as he finishes the test phases, it seemed very convincing and dynamic to me but it's entirely subjective and it's not live: just to tell you that I think the release of O-NOORUS D3 PRO is imminent

 

[daniboun]

Thank you, appears to be a (even very) fabulous (Integrated) alternative, doesn't it :=)

A that price you take 0 risk : seems to be a great deal and I got only very positive feedbacks

 

[daniboun]

Thank you, it appears (no Topology/specs, as yet) that the O-Noorus D3 PRO - A new TPA3255 PFFB amplifier with DAC will be a fabulous Power DAC, perhaps/possibly even an Integrated Power DAC.... we shall know soon/imminently. Often, patience and quality go 'hand in hand', don't they? but often, 'haste makes waste', doesn't it? :=)

We're all waiting for the D3 Pro, but we should be careful not to fall into confirmation bias. An ASR test will give a verdict to the entire community.

 

[KL....]

A that price you take 0 risk : seems to be a great deal and I got only very positive feedbacks

Yes, only missing SPDIF/Coax input but 3x analogue, USB, BT input is nice and 2x 300W (into 4R?, not indicated) is nice, isn't it?

 

[ICIETDIYEUR]

People hi

I don't want to be "devil's advocate", but I think we should refocus things a little.

Indeed, I think that in view of the format of the O-NOORUS D3 PRO amplifier, it is above all a device dedicated to the office with proximity speakers that allows it to be connected to a computer with a built-in DAC and a BLUETOOTH connection for a smartphone

Its remote control even allows it to make presentations (videos, POWERPOINT,...) during various meetings

Although it can also, of course, be used as an amplifier with a built-in (good AK4493SEQ) DAC for a main system, I think the latter would have to evolve in terms of format if it were to be equipped with additional inputs with enough space between the inputs and outputs in order to obtain better accessibility to the connectors and without them "getting in the way" with each other

ALEXANDER could in the near future, perhaps, propose such a "device" ?

So "Wait and see"...

IMPORTANT NOTICE:

Regarding the "famous" 2 X 300W (specifically 315W in BTL mode under 4 Ohms at 10% DHT), I think it is necessary to clarify a little more the "situation" towards the customers.

This is a given indication that is "extracted" from the TEXAS INSTRUMENTS datasheet which specifies this power in the "best conditions" of use of the TPA3255 chip, specifying that they are obtained with a voltage of 51V, about 12A (i.e. a little more than 600W for the PSU) with a substantial heat sink and in a volume/case allowing a good evacuation of calories (heat).

Most dealers state this specification (I would say all) and some more clearly indicate the exact power that can be achieved depending on the load used for a given distortion rate and the power supply used for their amplifier model.

This last indication will be (or not) confirmed by Amirm during a review of the device concerned as you may have seen here on ASR

This is done.

 

[KL....]

People hi

I don't want to be "devil's advocate", but I think we should refocus things a little.

Indeed, I think that in view of the format of the O-NOORUS D3 PRO amplifier, it is above all a device dedicated to the office with proximity speakers that allows it to be connected to a computer with a built-in DAC and a BLUETOOTH connection for a smartphone

Its remote control even allows it to make presentations (videos, POWERPOINT,...) during various meetings

Although it can also, of course, be used as an amplifier with a built-in (good AK4493SEQ) DAC for a main system, I think the latter would have to evolve in terms of format if it were to be equipped with additional inputs with enough space between the inputs and outputs in order to obtain better accessibility to the connectors and without them "getting in the way" with each other

ALEXANDER could in the near future, perhaps, propose such a "device" ?

So "Wait and see"...

Thank you, apologys, glad @daniboun mentioned this one but as you mention, all are looking to the O-Noorus D3 PRO - A new TPA3255 PFFB amplifier with DAC, aren't we? Perhaps, this could called a discussion, while waiting, shows what posters would like, keeps the thread active.... reasonable, isn't it? :=)

Re amplifier with a built-in (good AK4493SEQ) DAC... focus/context is always good, any further details that you would like/able to mention or is it prefered to be a surprise which is also (often) nice/good, isn't it?

 

[JSmith]

Always nice to see new amps coming out, but in this case I can't help but feel it looks like a clock radio aesthetically... ymmv.


JSmith

 

[ICIETDIYEUR]

@JSmith.

You're right but other "more aesthetically successful" devices (it's personal and subjective) don't have the function of alarm clock, this one at least has the appearance of it (LOL)

This chameleon LOOK can be an advantage to impress his friends who don't expect a Hi-Fi system to be present on the desk

If you don't have an alarm clock, then it's not too late thanks to O-NOORUS D3 PRO: buy it

That said, I think that ALEXANDER who has an "open mind" will gladly accept your suggestions concerning the appearance of a future amplifier model.

For my part, I have already made proposals to him that take into account the technical specifications necessary for the proper construction and operation of such a device...

 

[river road]

Sure.

I always find it funny that many are ready to pay way more to WiiM, Topping, etc. for something similar but want equally good product for almost 50% less from O-Noorus.

P.S. Not pointing out anyone specific, just commenting on those many generic posts in relation.

I agree that ‌Fosi Audio‌, ‌WiiM‌, and ‌Topping‌ each offer unique strengths in audio technology. However, as you noted, there are notable distinctions in pricing and application:

• ‌Topping‌’s analog circuit design expertise is exceptional, particularly their ability to achieve ultra-high signal-to-noise ratios (SNR) and precision measurements. While their products are marketed for HiFi, their technical capabilities (e.g., SNR levels below -140dB) might indeed be better suited for ‌acoustic testing instruments‌—such as creating a China-designed alternative to Audio Precision. This could fill a critical gap in the professional measurement market.
• Regarding pricing, brands like ‌O-Noorus‌ currently hold an advantage in cost-effectiveness for consumer audio, though their performance benchmarks differ.
• The performance of O-Noorus products is good, but more marketing efforts are needed to make them visible to more users.

On the topic of ‌audible practicality‌:

• My observation about human hearing limits aligns with the scientific consensus. A system-wide SNR >100dB and peak SPL of 105dB (with an average of 85dB) already exceed the thresholds of most real-world listening environments. Pursuing extreme specifications (e.g., 130dB SNR) may prioritize marketing over usability, while excessively high SPL risks long-term hearing damage.

If you’re exploring collaborations or product development strategies that balance technical innovation with human-centric design, I’d be happy to discuss further. @Alexander Lin @ICIETDIYEUR

 

[ICIETDIYEUR]

Hello River Road .

In view of the terms you set out concerning the various technological advances and the fact that they (far) exceed the threshold of human audibility nowadays, it seems to me that from a purely practical point of view, "balancing" technical innovation with human-centered design should be the way to go and even a priority.

The design should not be "set aside" either, knowing that it should not "conflict" with the technical requirements of a device to function properly and safely for the user

My personal reflection is to think that the good ideas of each brand on the market should be able to be grouped together within the same device with the best technologies, offered at a "fair" price and (as far as possible accessible) to all:

I am convinced that this is possible but the big "variable" that often "explodes" the result of this calculation is called "competition driven by personal enrichment"

(to the detriment of the greatest) number: users = buyers).

 

[RoA]

Whilst I kind of welcome the drive for cheaper stuff from China, there is usually a limit from whereon things start to suffer, be that quality control (quality of device/components), software, updates etc. ... take your pick. The chinese are not stupid. Try to 'rip them off' and you normally get what you deserve.

Better pay a little more (Wiim etc).

My 2 pence.