M-400's get a little sloppy bridged into 4 ohms. But, I agree with you. They are a great little amp. I'm running one for bass reinforcement in my family room driving a pair of AR-3a woofers (4 ohm, but in stereo). Only feeding it 90Hz down.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer