daniboun
Major Contributor
What do you guys make of this?
https://www.diyaudio.com/forums/class-d/362498-aiyima-a07-tpa-3255-measurements.html
contains link to A04 measurements by the same guy.
For 10 V rms, 1 kHz, 8 R, the A07 seems to be doing a lot better (-96 dB 3rd harmonic) compared to the A04 (-81 dB). Of course, the A04 was the later green board.
I would add, the two amps used here are fairly cheap versions (bad caps etc) compared to the A04 with the 2x 3000µF Elna power caps + Red robe Elna.
I personnally own that A07 and compared it to my A04 (best version) with good caps and upgraded inductors : listening is obvious, the A04 is more organic, better bass, everything is cleaner and more balanced. I am using a 35V / 6A SMPS brick and will test soon with a clean LLC PSU with a good AC filter (35V / 8.5A 300W / 600W peak). I am using OPA1656 on both here.