I have tried driving the low end,bass section of my speakers with a number of amps,most of them disappointed me.The worst were the Classe mono I think model was 350,(cannot remember)second worst were the Bryston 7 monos,third were the YBA Passion 1000 monos(excellent for mid and high frequencies,Acoustic Reality 1000 monos(ICE amps) were pretty good,but better were the Innersound 1KW amps monos, and THE best are the Electrocompanient NEMO monos.The bass speakers in my system have an impedance of 4ohms. The latter amps are currently in my system.