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

[Audionaut]

Just hours after replying to the mail from O-Noorus

Service directly from the developer and manufacturer.
Where else can you get that?
A big compliment to @Alexander Lin

Have fun with the D3 Pro, Roy

 

[anonyless]

does anyone care to comment why was a large heatsink included with the amp?
from the manual

contents:
D3 PRO host x 1
AC/DC adapter x 1
AC power cord x 1
Product manual x 1
Antenna x 1
Remote control x 1
Data cable x 1
U disk adapter cable x 1

 

[Roy_D]

Service directly from the developer and manufacturer.
Where else can you get that?
A big compliment to @Alexander Lin

Have fun with the D3 Pro, Roy

More updates to the manual shortly

 

[Roy_D]

does anyone care to comment why was a large heatsink included with the amp?
from the manual

contents:
D3 PRO host x 1
AC/DC adapter x 1
AC power cord x 1
Product manual x 1
Antenna x 1
Remote control x 1
Data cable x 1
U disk adapter cable x 1

I ask the same question.
I find the D3 Pro case temp at 42°C with a room temp of 24°C kind of high. The effectiveness of the heatsink is not all that great. The tinkerer in me wants to tinker. I really want to open the case up and have a look inside to see but not void warranty..

 

[Roy_D]

Certainly having fun with this amp on tap.
Music all day!

 

[Pierre159]

Hello,

Excuse my beginner's question. I received the 3D Pro. I have a question: can you connect a tablet to the USB-C port and stream from it? Will the audio quality be good?

 

[Roy_D]

Hello,

Excuse my beginner's question. I received the 3D Pro. I have a question: can you connect a tablet to the USB-C port and stream from it? Will the audio quality be good?

An older older nokia tablet we have which does support usb otg which is helpful in connecting to dacs there was audio coming through but not terribly well at all and nothing in this older android version was helpful in improving the experience so I think the adage is YMMV.
When you try make sure volume is low ^^

**Just tried my Google Pixel 6A over USB-c to the D3 Pro - works fine.

 

[Mike_Trueman]

What is the power @8ohm?

 

[Xombul]

Hello, I have just received my d3 pro today. It is currently connected with a basic toslink cable to a Wiim pro and the sound is extremely good.Subjectively
, I can't ear any difference between the d3pro and a smsl dac+ncore252 combo.

I have a question and 3 remarks to @Alexander Lin . My question : What to do with the heatsink?
My remarks : 1) even if turning on the d3pro is quite straightforward, there was no owners manual in the package.
2) The GaN brick charger is black but the power cable is white (could it be black?).
3) To reduce the number of power cables would it be possible to design a GaN charger with some usb outs, 12V trigger, on/off switch and a led. Nothing fancy, but it would be handy.
Again, don't get me wrong with my remarks I am fully happy with my new (very little) toy and many thanks to the designer.
PS: I do recommend using banana connectors for the loudspeakers wires to prevent any short circuit. The amp is so small.

 

[Alexander Lin]

Hello, I have just received my d3 pro today. It is currently connected with a basic toslink cable to a Wiim pro and the sound is extremely good.Subjectively
, I can't ear any difference between the d3pro and a smsl dac+ncore252 combo.

I have a question and 3 remarks to @Alexander Lin . My question : What to do with the heatsink?
My remarks : 1) even if turning on the d3pro is quite straightforward, there was no owners manual in the package.
2) The GaN brick charger is black but the power cable is white (could it be black?).
3) To reduce the number of power cables would it be possible to design a GaN charger with some usb outs, 12V trigger, on/off switch and a led. Nothing fancy, but it would be handy.
Again, don't get me wrong with my remarks I am fully happy with my new (very little) toy and many thanks to the designer.
PS: I do recommend using banana connectors for the loudspeakers wires to prevent any short circuit. The amp is so small. View attachment 460672

View attachment 460673

Thanks for the suggestion.

The heatsink is placed on the surface of the case.

1. Did you receive the electronic manual by email?
2. There was no black in stock at the time of delivery. Yes, it will be black in the future.
3. USB2 can output 5V.

 

[Xombul]

Hello Alexander,

Thank you for your answers.
Regarding the heatsink, it is quite an unesthetic solution and I found that the efficiency is not good (with or without heatsink the temperature of the box is above 40°C).

I have downloaded the user manual from this site and it is OK. I advise having the link printed somewhere on the box.

USB2 is a smart idea to feed a streamer and reduce the number of power cable, thank you for this.

In case you plan to sell a V2 I recommend considering : better thermal management, stereo jack instead of RCA for analogic in/out and LFE (space saving), safer speakon like connectors for loudspeakers (please provide the plugs)

Eventually d3pro is a good basis for a d5 with 2 tpa3255, trs balanced inputs, a nicer screen with vu meters, 3 usbc.

 

[Alexander Lin]

Hello Alexander,

Thank you for your answers.
Regarding the heatsink, it is quite an unesthetic solution and I found that the efficiency is not good (with or without heatsink the temperature of the box is above 40°C).

I have downloaded the user manual from this site and it is OK. I advise having the link printed somewhere on the box.

USB2 is a smart idea to feed a streamer and reduce the number of power cable, thank you for this.

In case you plan to sell a V2 I recommend considering : better thermal management, stereo jack instead of RCA for analogic in/out and LFE (space saving), safer speakon like connectors for loudspeakers (please provide the plugs)

Eventually d3pro is a good basis for a d5 with 2 tpa3255, trs balanced inputs, a nicer screen with vu meters, 3 usbc.

Thank you very much for your advice.
It seems that people prefer RCA jacks instead of stereo jacks. Is this true?

 

[Xombul]

Thank you very much for your advice.
It seems that people prefer RCA jacks instead of stereo jacks. Is this true?

I don't use d3 pro analogic inputs, as the internal dac is very good, but there is a cheap solution for RCA addicts.

 

[daniboun]

@Alexander Lin > I don't know if you forgot about me, but you were supposed to send me a one for testing...
Pending some measurements that have been shared:

 

[Audionaut]

@Alexander Lin > I don't know if you forgot about me, but you were supposed to send me a one for testing...

Me too, Alexander