I recently purchased an SPL meter for my HT. When I used it last night I first tested the speakers at 1 meter at 80db. Once I reached 80db with the front left I tested the front right and got a reading of 78db at the same volume. Is this normal? Then I found my center speaker was about 72db. (I'm guessing on that, I can't remember off the top of my head but it was much lower). Also, the pink noise wasn't isolated only to the channel I was testing. I noticed it coming from the other channels too, although only a very slight bit. Is this problem a function of the receiver or DVD player or just a crappy test disk? Or is it a problem at all? I was using Steroephile's test CD 3.

My set up is:
Polk R50 - Fronts
Polk CSi30 - Center
Polk R15 - Rears
Pioneer VSX-D711 - Receiver
Pioneer DV363 - DVD

Any suggestions or comments about any of the above would be greatly appreciated!