Marantz amp advice needed

I recently puchased a Marantz MM9000 off of audiogon. It is a THX certified five channel amp rated at 150 watts into 8ohms. There is no mention of driving 4ohm loads in the specs. for the amp. Does anyone have any first hand experience driving 4ohm speakers with this amp?
according to Marantz the MM 9000 at 4 ohms runs at 230 watts. I have a Marantz MM 9000 and have ran mine on Axiom M80 4 ohm speakers with no problems.