I have been using the O-Noorus D3 for a couple of weeks now, so I'm happy to provide a few, preliminary, comments.
For context, my setup is a desktop (nearfield) application running Q Acoustics 2010s and a Wharfedale SW150 sub in a large office. The source is an Amazon Music subscription streamed via a near new Dell Inspiron laptop.
I was using the Fosi Audio BT20A in this modest setup, but was concerned that the internal DAC of the Dell was, perhaps, letting down the side. I was looking at introducing an external DAC, but in my search, stumbled upon the D3. Internal DAC, red case, TPA 3255, LED display, remote control, included PSU, $170AUD - why not?
I have the D3 connected via the USB input. (I tried the 3.5mm (which utilises the Dell's Dac) but preferred the sound signature using the D3's DAC).
In short, I like the D3 a great deal. I think it looks great and love the LCD screen (the main reason I bought it TBH).
The execution of this little amp, from a functionality perspective, is excellent in my opinion. Mine shipped without an instruction manual, but it was very simple to work out how everything works. Very intuitive in my experience.
The LCD screen offers 4 levels of brightness and 9 different colours. The remote control does on/off and mute, and adjusts volume, bass and treble, and input, but not LCD colour or brightness.
The sub out is variable, but sends a full range signal (no low pass filter) to the sub. It continues to send output to the subwoofer even when the unit is off.
The only analogue input is a 3.5mm jack.
I have absolutely no complaints about the sound quality. The QA 2010s are not the last word in refinement and can get a little sharp, but the D3 sounds better to me than the Fosi in the above set up (possibly due to the different inputs (DACs) utilised) particularly in the higher frequencies; less wince inducing. One of my tests is vocals (the spoken voice) on you tube. Some class D amps (including the Fosi) can make you tube vocals sound harsh and brittle. The D3 doesn't (as much). Not perfect, but no worse than my Marantz NR1405.
In my setup, the D3 sounds better, to me, than the Fosi Audio BT20A Pro. Not by a lot, and possibly only because of my Dell's DAC when running the Fosi.
For reference I also run a variety of Tannoy, Monitor Audio and Q Acoustic speakers with Marantz, NAD, Aiyima, Nobsound (Douk Audio) and Fosi Audio amplifiers. None of which could be considered high end, so my impressions of this amplifier should be considered in this context.
