It had always bothered me that my rear center seemed to be quieter than my left and right surrounds, but I figured it had to be my imagination since I had calibrated all my speakers using the radio shack meter with my receiver's (yamaha rxv3000) test tones. Tonight I finally tried something different. I put on some music and set the dsp to 8 channel stereo. Then I turned off the sub, mains, center, front effects and turned the right surround speaker all the way down (-10). Then I played music with the center rear off so that basically the only sound was coming out of the left rear. I then checked the db level on the meter. Next, I turned the left surround speaker all the way down so that the only sound was coming from the rear center. My ears had been right all along! Using the exact same part of the cd I had to turn up the center rear to + 7.5 to match the same db level that the left surround was at a level of 0. Before, I had always had both my left and right surrounds AND my rear center set on 0! Now I can really tell that the rear center is putting out sound where before it was tough to tell. It makes me wonder if my other speakers are not really equal to my mains (the volume on my mains is constant, all the other speakers are adjustable) since I used the receivers test tones for that too. I am going to test them out using the same 8 channel stereo technique as before and I'll post my findings.