im using a Denon AVR-985 in my downstairs theater. there is a door leading to a patio directly outside that room. i have some outside speakers hanging and i have them connected to the 985 hooked up to the SB/zone2. is there any way to run the outside speakers without having the main zone speakers inside on? i want to turn the volume up outside, but it also turns the volume way up inside. do i need to hook another amp up from the pre-amp on the 985 and run the outside speakers off the 2nd amp?