Here's what I was able to find:
- Topping MX3s ($200)
- SMSL A300 ($200)
- SMSL AO200 ($240)
- Audiophonics TPA-S120 ($240)
- Dayton Audio WF150A ($250)
- Sabaj A30a ($500)
I have an experience with the Audiophonics TPA-S120. The amp was nicely built with a robust case and a good set of fairly high quality inputs and outputs.
However, in my case the amp was
extremely noisy. By this I mean I could hear the speakers hissing over 3 meters away to my listening spot which I am not used to. I've owned a lot of amplifiers and the only one as noisy as this was a Tangent Ampster BT II. Two other amps I use regularly nowadays are NAD C315BEE, NAD C720BEE and a Audiophonics MPA-250NC xlr which all are silent as a library at night. Connecting my speakers to AP TPA-S120 was a bit of a shock when it comes to that.
Also there was a deficit in the software. Selecting USB-input did not work but one had to select BT-input to use USB-input, but at the same time to use BT-input selecting BT-input worked just fine and the amp paired with my Android phone with no issues. I did not try to feed signal to the amp at the same time from both inputs though as I was afraid what would happen.
Anyway I'm not sure if my amp was a deficit one when it comes to hissing but I was confirmed that there are issues with the "naming of inputs" at the manufacturers end. To me it seems that the problems goe a bit deeper than that but then again, I may be mistaken.
To be honest this experience keeps me far away from amps based on TPA3255 chips for a long time. Yes, yes, I know. It's all about the implementation. At least mainly.
Well, I shall stick to Hypex nCore or Purifi when it comes to D-class.
Edit: corrected a couple of typos