I just calibrated my reciever's (Onkyo 777) sound levels using Avia GTHT and found that my bass was about 6 DB too high. I haven't calibrated it before using Avia, just the internal tones and have never noticed it to be a problem. Lately I've been noticing what sounds like a little too much bass. Is that possible? I used Avia and found that the receiver's test tones disagreed by a decibal or two on most channels, but was 6DB too loud for the sub. Is this normal for a receiver. Otherwise I love the receiver. I've had it for about five years and have enjoyed its sound and user friendliness. It has kept me satisfied enough to keep from upgrading.