AIYIMA Audio A70 Stereo PFFB Leistungsverstärker TPA3255 300Wx2 Klasse D Hifi AMP für Passivlautsprecher mit XLR RCA Balanced Out

We see a nice boost in SINAD as predicted, landing the amplifier essentially in our "excellent" category:

RCA input has fair bit lower performance but still above average:

Note that I adjusted the volume down to 25 dB per my recent standard of testing amps (used to use 29 dB).

Noise performance is excellent:

Despite its lower gain with XLR input, you can still reach full power at 3.3 volts which is well below nominal 4 volts we see out of majority of DACs. So I am good with that.

Let's jump into frequency response as that is the other big deal:

We see a bit of frequency dependency but it is outside of our hearing range.

I set the subwoofer output frequency to the lowest and measured this:

Crosstalk is extremely good:

Good performance numbers give way as you go up in higher frequencies in multitone and especially in 19+20 kHz IMD:

Let's see how much power we have:

That's a lot coming out of this little box. We are talking nearly 360 watts total. 8 ohm output is naturally lower:

Edit: as noted, performance does degrade above certain frequency:

My reactive load doesn't like these bridged amps. The issue seems to be in one channel so I left that disconnected and drove only one:

The amplifier is specified down to only 4 ohm but seemed robust enough to even handle 2 ohms, albeit with a good bit of voltage drop. Translating the above into watts we get:

For those of who want to use these amps in mono, you now have that information as well.

There is likelihood of a turn on "pop" but turn off noise is completely eliminated:

Finally, amplifier was essentially ready to go on power up: