I am sure this is answered somewhere in the forums already, but despite several searches, I could not find it (only a few posts about mislabed speakers).

Anyway, I have the M60's at 8 ohms, the QS8's at 6 ohms, and the VP150s at 6 ohms. What ohm setting should I set my receiver to? I have a choice of 4, 6 and 8 ohms - but I can only pick one value for the whole system. The receiver is a Pioneer VSX-32 (or will be when it actually arrives). Thanks!