Hi, sorry if this is a dumb question. I'm taking delivery tomorrow of my first home cinema system, so am new to it. I'm getting the Yamaha RX V1500 and Mordaunt Short Avant Premiere Plus speakers. I'd just like to check that I'm right in thinking the rear speakers of the Premiere Plus connect to the 'Surround left' and 'Surround Right' NOT the 'Surround Back Left' and Surround Back right'. Also, the Mordant short spec. says the impedance is 4-8 ohms. Do I leave the Yamaha set at 8 ohms (rather than changing it to the 6 ohm setting). Thanks in advance for any advice.