After buying a pair of Buchardt Audio S400 MKII speakers, I struggled with muddy bass in my room. I very nearly sold the speakers, thinking my room was to blame for the poor bass integration. Instead, I bought a pair of these monoblocks. Lo and behold, the Fosi V3 monos power the Buchardts with no problem. The in-room bass response is nice and tight. The subwoofer integration works properly (after I inverted the polarity to match the amp output). I’m impressed with the sound quality and blown away by the value for the money.