Ok...here's my dilemma: Current system- Yamaha RX-2095 Main: ?? Center: ?? Rears: NHT SB-3 (8 ohm speakers) I'm currently planning to upgrade my front and center channel with 4 ohm speakers w/ around 89-90 db sensitivity. I listen at low to moderately high volume levels (currently, 10-11 o'clock on the receiver dial on extremely rare occasions). I was wondering if mixing the 4 and 8 ohm speakers would be a problem. I know that most forums cite that the difference is negligible with a proper power supply. The Yamaha is rated at 5x100 watts AND includes a switch for 4 and 8 ohm settings. Which setting should I use, and will mixing the speakers at the lower/higher setting pose a problem?