Randy, you may have noticed that a few times when I've commented on auto-calibration that I've said that it may be more accurate than a manual calibration, especially for the sub. Your experience probably illustrates this, the reason being that there's a delay in the circuitry of the sub which causes the sound to arrive later than would be expected from a simple measurement of the physical distance.The delay may only be a few milliseconds, but each millisecond makes about a 1.1' difference. In other words, trust your receiver, not your tape measure. I didn't recheck, but I think that the Denon manual is one of those that makes a brief reference to this somewhere in the auto-calibration section.
Took a look at the
manual , Randy; see the note at p.24.
