Ok - I will add more details in a while. So I am also at an age where I cannot hear high frequencies > 14.5K.I will be very interested in your evaluation. Full disclosure, during my "sales pitch" I did not mention I have some age related HF hearing loss, so your subjective evaluation will be more accurate than mine. To my ears, it sounds great.
So my subjective (and somewhat objective as I measured it ) compared to the Fosi Audio V3 with the same speakers / microphone / cables etc is it sounds very good with a little caveat I will mention below. So, when I level matched both and did a few REW sweeps, the frequency response was almost identical to the Foai Audio (a very slight earlier roll of bass but at a level 30hz that my speakers can't produce anyway ). So I would say without EQ it has the 'default / neutral' sound signature of the TPA-3255 (so also similar to the Aiyima A07). I didn't trust it with the 48V power supply so I used a 36V that I had from the Fosi Audio BT20A pro.
But I would guess it has slightly worse SINAD than the Aiyima or the Fosi Audio's, just based on the very faint hiss (with my ear close to the tweaker) I get from all of these amps - but this one subjectively seemed very slightly louder - thought not audible more than a foot away from the speakers - unlike some of the terrible TPA3116 Amp's I tried which were very audible to me from a seating position. Also the bluetooth especially seems even a bit noisier. There I also an audible hum when I switch it on - where I think the bluetooth is search for its paired device - this thankfully goes away after 10 seconds or so. It's such a shame they bothered with bluetooth on this device.
Totally agree - I hate that I have to toggle bluetooth off before the line in is enabled and that horrible blue indicator (which I will cover up).I believe theBru5 (and probably BDM9) AD/DSP/DA stuff all works at 44/48 kHz. That will disqualify it for HiDef audio fans, and will limit its s/n when measured. I will be particularly interested in how much impact you hear on sound quality.
The only 2 things I dislike about the amp are the flashing Bluetooth indicator, and that it defaults to the Bluetooth input on power up. It requires a tap on the "Pairing" button each time to get to Line in.
As for the PEQ - I mostly like it - the software seems very extensive and powerful (though slightly difficult to use). I haven't done too many tests yet and I can't see where I can have independent left and right channel PEQ settings? There is an A and B in the software but that seems to just be to do A / B comparisons rather than A being the left etc Have you seen where that can be tweaked??? I like how the settings are enabled in real-time, very handy with REW measurements.
Anyway a quick comparison chart shows the mostly nice much flatter curve I get with some basic PEQ ( 6 filters recommended by REW ) - though I really need to see how to do the left and right channels independently to get the best effect in this particular room. And I need to solve the mid-bass but I am going to play around some more with the software this week.
But overall for Eur30 - this is an unbelievable fantastic amp. The software won't be for everyone which is probably the only thing holding this back.