In reply to:
I've been noticing distortion in movie soundtracks which is somewhat annoying.
We watched a movie last night and I noticed distortion in the center speaker. This was a scene where a lot of police cars came in with the sirens wailing. My wife didn't notice it but I sure did.
The only level adjustment I made during calibration on my speakers were Front Right +2db, Left Rear -4db and the sub I dropped to -6db per instructions that came with my SVS.
I do remember when I was calibrating and had my master volume at +13db on the readout (this was 75db on my SPL using DVE) I had a very bad hissing noise in the rears that sounded like a VERY large snake. I mean it was almost overbearing which I know affected the calibration levels of the other speakers since it was so loud.
I think I just have a noisy/underpowered amp that needs to be replaced.
Thanks guys for all your suggestions and help. Guess it's time to spend another $500 for a newer Onkyo 601.