I just bought an onkyo 595 which can drive 4 ohm speakers. I haven't hooked it up yet, it just arrived. Currently I have a mismatched system (got a good deal from a friend who was upgrading). They are all 8 ohm compatible. Definitive BP 8B's for mains, cerwin vega center, yamaha bookshelf rears. I don't currently have a sub because I live in an apt.

The weakest link in my system is my center and I would like to upgrade it to a vp150, but I wouldn't be upgrading the rest of the speakers until later.

Now I have a question. Is it a problem for the onkyo to drive a 4ohm center when all the other speakers are 8ohm? There is a switch on the back of the onkyo for 4 ohm speakers and the second position is for 6 ohm + speakers, so I assume I'd have to upgrade all my speakers to 4 ohm (epic 80 sysem) at once or switch to a vp100. Thanks.