I just bought an RX-V2300, I don`t wanna sound like a complete dummy but need some help. The impedence switch where should it be set, my E-715 vegas say compatible with 8 ohm or less, I`ll be adding their rears to match soon. And the A / B main speaker switch-- can I run both at the same time to power another set of mains and if I do what does that do to power output and impedence? In 6 channel stereo mode what freq. are being output to the rears? could I run another set of full range speakers there? Sorry bout so many Q??