I'm a newbie to this forum and would like a professional solution to my HT setup. I recently purchased a Yamaha RXV 2300 receiver, 2 Tannoy S6 floorstand mains, 2 S6 bookshelf rears, 1 S6 center. All the speakers impedance are 6 ohms and the receiver has switchable impedance (4 ohm and 8 ohm) on the back. Which impedance setting should I set this at or are the speakers compatible at all? I would greatly appreciate any answers.