AIYIMA A01 100W +100W TPA3116 Stereo Amplifier 2.0/2.1 Channel Class D Audio Amp Receiver with 3.5mm AUX Output + DC24V Power Adapter for Home Audio Speaker

I bought this because it was on sale and so far, I am very happy with it.There's no denying that this faces a lot of competition at full price (~$75 USD is what I see) -- even from the brand's own line up! Personally I was considering other options even at $50 USD since there are other options using the same chipset (TPA3166) or other TI chipset.Having said that... I'm using this to power a pair of bookshelf speakers on my desk about 3 feet away. I got annoyed by the pink noise/static of the previous amp that this replaces. Now, I was able to force the unit to create a lot of static by disconnecting the source from it and cranking all the dials to the max as a stress test. But with normal usage that isn't a problem.I can probably hear very very faint noise with my ears right next to speakers after dialing in it at about 75 dB peaks listening to music (tone control at about center/"+0" and volume control several clicks left of center) with source connected but paused (Android tablet with volume set a little over mid way/before it turns red). Definitely discernible noise with source disconnect and my ears right next to speakers. In neither case was I able to pick up any noise at my listening position.If I listen carefully with volume maxed and source pause there is faint noise but not a problem for me and hopefully people would be way more than 3 feet away in that case. It does suggest you might want something else if you plan on using this in a very large room and would really need to crank it.The unit and knobs seem well built and feel sturdy. It isn't heavy at all but for its size my brain is constantly expecting something much lighter.Getting to acoustic performance... this sounds good to me subjectively. No discernible flaws while listening to music and watching YouTube. However, REW measurements (take with a grain of salt since is not completely calibrated) show roll off below around 270 hz (part of it I know is from my speakers from around 130 hz) and and peaks and valleys from around 600 hz to around 1 khz and around 1khz to around 2 khz. Bass control is able to help a little with below 270 hz. Mid control doesn't seem to do too much for around 600 hz to around 2 khz.This is all with line inputs (RCA) so I can compare things using the same speakers driven by an older Yamaha AV Receiver (using same external DAC: tablet -> USB C -> DAC -> RCA). I did test it a little with aux input but I'm not sure what's causing more noise there. There is never any noticeable noise when there is music/content playing.Now... the only thing missing is... will have to see if this stands the test of time (what this replaced did not).Update #1: I found one song on a streaming service and I never noticed the issue on AVR setup before despite having listened to song a number of times. On the Aiyima, the harsh vibration of some sort was pretty apparent. Not sure why I didn't noticed it before on the Aiyima... maybe it is because it was towards the very end of the song and I skipped the end? I know it is a repeated section and tempo and beat is just ramping down so totally didn't expect issues there? The saving grace for the Aiyima is if I am right next to my speakers with my AVR I can hear same harsh sound but it is quite faint (so I can see why I never noticed it with AVR). Feels like the class D amp is not very forgiving of poor source/issues inherent in source/recording (compounded by fact I am using it for near field listening).