You would be able to knock me over with a feather if that Kenwood could supply anything close to rated power into 4 ohm speakers. I suspect that's why there's no 4 ohm listing in their specs. I'd expect a decent amp to be able to up the power output by at LEAST 50% going from 8ohms down to 4ohms. If the Kenwood could do continuous 150W into even 2 channels @ 4ohms for any length of time I would be pretty surprised. I'd also be curious to see what the distortion numbers looked like....probably not pretty...and not something you'd want to subject a nice set of speakers to.

Cheers,