IMO as nice as it is, V3 not a great amp to push to its limits with highest usable power...for continued high power need, do Fosi monoblocks, or ideally, spend $600 for a Hypex amp...You can get that for the money (+ shipping)
FOSI AUDIO V3 Stereo Class D Amplifier TPA3255 2x225W 4 Ohm - Audiophonics
The V3 from Fosi Audio is a compact and powerful amplifier at a very affordable price. Despite its simplicity, the V3 amplifier uses high-quality audiophile components such as a TI TPA3255 amplifier chip and delivers up to 2x225W @ 4Ω.www.audiophonics.fr
89 and 141 watt https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-v3-amplifier-review.45757/
only cons i have with that amp is pop sound when turning it on,off