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

[Audionaut]

You know

 

[Roy_D]

or the Day of the Jackal ^^

 

[ICIETDIYEUR]

Maybe

 

[ICIETDIYEUR]

In addition to having quality and current components: this device is extremely versatile ->


D3 PRO inherits the D3 display and shell shape, and is black.

It is a decoder and also a TPA3255 PFFB amplifier.

1、Hardware configuration ->

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

Amplifier module: TI TPA3255 PFFB (Post Filter Feed Back 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 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)

In short：when RCA is not used as input, it is output.

As output, the sound source is mode shared.

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Working modes (topology: AK4493S -> OP Amp-> NJW1194 -> OP Amp*2 -> TAP3255) ->

F : NJW1194 Front end

B：NJW1194 Back end

D-F mode: Decoding source from NJW1194 front-end output, TPA3255 power is disconnected, tone/volume is invalid (only DAC)

D-B mode: Decoding source from NJW1194 back-end output, TPA3255 power disconnected, tone/volume adjustable (DAC with adjustable volume)

A-F mode: Decoding source from NJW1194 front-end output, TPA3255 power on, tone/volume invalid (only Amplifier)

A-B mode: Decoding source from NJW1194 back-end output, TPA3255 power on, tone/volume adjustable (Amplifier with adjustable volume)

 

[Hellboy.]

??? The chip support LDAC but the Amp not. If this is the case what is the point in mentioning LDAC?

Bluetooth chip: Qualcomm QCC3084, compatible with aptX Lossless / LDAC / LC3 and other high-definition encodings
Bluetooth 5.3 (aptX Lossless transmission, delay <50ms)

 

[daniboun]

The chip support LDAC but the Amp not. If this is the case what is the point in mentioning LDAC?

LDAC is just a codec.... The BT chip is in charge of decoding it. The decoded signal then passes from the BT chip to the DAC then to the amplifier

 

[Audionaut]

The BT chip is in charge of decoding it. The decoded signal then passes from the BT chip to the DAC then to the amplifier

As far as I know, the QCC3084 does not require an external DAC to output an analog signal. It has an integrated stereo DAC that delivers analog output signals directly to the amplifier.

You can bypass the internal DAC and send the digital signal to the AK4493S.

But is this the case with the D3 Pro @Alexander Lin?

 

[daniboun]

As far as I know, the QCC3084 does not require an external DAC to output an analog signal. It has an integrated stereo DAC that delivers analog output signals directly to the amplifier.

You can bypass the internal DAC and send the digital signal to the AK4493S.

But is this the case with the D3 Pro @Alexander Lin?

DAC stands for digital - analog converter; it takes the digital information in your music files and changes that into analog sound waves. Those waves can be transmitted through a physical cable and I guess over Bluetooth or wifi....

 

[Audionaut]

DAC stands for digital - analog converter; it takes the digital information in your music files and changes that into analog sound waves

Realy?

 

[Alexander Lin]

As far as I know, the QCC3084 does not require an external DAC to output an analog signal. It has an integrated stereo DAC that delivers analog output signals directly to the amplifier.

You can bypass the internal DAC and send the digital signal to the AK4493S.

But is this the case with the D3 Pro @Alexander Lin?

QCC3084 outputs digital signals through the IIS bus and is decoded by DAC AK4493S.

 

[Roy_D]

=D thank you o-noorus team and @Alexander Lin very much looking forward to enjoying our music through this for the moment flagship amp

 

[kapes]

Did anyone receive their order yet? It has been 3 weeks since I ordered and it hasn't been shipped yet. Their customer service also stopped responding in the last few days. Before that I used to get a reply saying that the unit will be shipped the next day

 

[Roy_D]

Hope you get word soon Kapes!
Mine arrived in my country yesterday which is a whole lot sooner than I expected from the other side of the world

 

[Roy_D]

if I read my local mail delivery app correctly I will get delivery of the D3 Pro between 1600 and 1800hrs today!
I will do an unboxing and post it here or YT and therafter begin binging some music !

 

[Roy_D]

Ok so one very unpleasant suprise; no manual is included with the amplifier @Alexander Lin and in going through the remote options I came across one that suddenly put the amp into full volume mode. I hope it did not damage my ears or speakers. I was exposed to the loudest sound ever for a short time. Highly unpleasant and worrisome.
If my son triggers that by accident for example. But for now I am really wondering whether my hearing was damaged by the incident. I was very close to one speaker.

 

[Audionaut]

suddenly put the amp into full volume mode

That is of course unpleasant.
You will have switched to full output level, where tone control and volume are bypassed.

Working mode
D-F mode (decoding mode, The sound source is output from the DAC, bypassing NJW1194, and the volume is not adjustable)

D-B mode (decoding mode, the sound source is output from the DAC, passing through NJW1194, and the volume is adjustable)

A-F mode (amplifier mode, the sound source is output from the DAC, bypassing NJW1194, and the volume is not adjustable)

A-B mode (amplifier mode, the sound source is output from the DAC, passing through NJW1194, and the volume is adjustable)

Be careful and test all options with low output source

 

[Roy_D]

 

[Roy_D]

The temps measure very similar all over the case except for the front vents 42c, rear vents 39.5c, top of the case pretty uniformly 40c as is the front display.

I have an old 120mm SilentWings pwn fan and usb controller- with amp sitting op top of fan running at just past on position totally inaudible everything is 35c

ambient is 25c

 

[Roy_D]

The sound is good. I would response is flat as can be - as far as I can tell by ear.
Pleasant bass mids highs at 40dB. Some of the highs on this Kef Q100 are higher than usual of course but nothing the amp is doing is making that any worse is what I'm hearing.
Remote responsive. Lots of inputs. Nice clear display at a distance. No bitrate displayed but cant have everything.
Except for that incident with the it going full volume - and I hope there is a way to childlock that away @Alexander Lin !? - all in all pretty darn neat.
And warm. I wonder if placing that heatsink is a must for longevity. Or of perhaps we can apply a thermal pad to internal components and have in interface with the case, and make some more perforations?

 

[Audionaut]

Except for that incident with the it going full volume - and I hope there is a way to childlock that away @Alexander Lin !? - all in all pretty darn neat.

It won't have parental controls, Roy.
What you can do is transfer only the safe functions to a universal remote control and keep the original remote control away from your child.