Have just connected all speakers to my Yamaha 1400 receiver. Yamaha manual states that if you are using 6ohm spkrs to chg the impedance level from 8 to 6 before powering on. I have M60's and VP150 which are rated at 8 ohms but my QS8's are rated for 6 ohms - which setting do I choose ? Any information would be appreciated. Thank you ... Paul