FWIW I used to have a BK Monolith and wasn't very impressed. It had significant distortion and noise. Replaced it with an ancient, dirt cheap, M2500 which is much better. Easily capable of shaking the floor, if that's what you want, but can be seamlessly integrated into the system. However, room correction is essential with either of these, unless you have an exceptional (large) room.

G68, DSP5000, M2500