In a 7.1 speaker setup how do you go about calibrating the two rear channels seperately? I recently bought the Harmon Kardon AVR8000 I know it's best to calibrate your speakers with source test tones such as Avia or VE. I have Avia, VE and Sound & Vision Home Theater TuneUp disks. I think Sound and Vision sends the rear channel test tone to both rears at the same time. I'm not sure because although I have the 7.1 receiver, external 2ch amp and the speakers my in-wall wire to the two rear speakers hasn't been run yet. Also, using EZset on the AVR8000 requires setting the volumn at -15. But if I use the internal test signals to manualy set speakers without using EZset to calibrate and then recheck using VE and my SPL meter I must turn the volumn up to 0 for the level to read 75db. Does this mean that 0 is the actual reference level of the AVR8000 for use with external test material?