Hey all.. I just ordered the M80's. The AV receiver I have (given to me as I'm just starting out) is a Yamaha HTR-5450. It has a switch on the back for 4 ohm speakers. Should I use this, or leaving it on the 8 ohm setting work also? Any info or help regarding what I can or can't do without hurting the speakers or receiver would be greatly appreciated!! My uncle has a sweet all Axiom setup....hence why I didn't even look at another brand of speaker. Thanks again!