Hi DXDawg,
As Ray3 points out, you will get more accurate results using the Radio Shack SPL meter and the Avia setup disc.
As good as the Denons are, don't get carried away with the auto-equalization facility. It's very hit and miss, and it will EQ your room for only one listening spot. As soon as you shift 1 foot or so on your couch, all the EQ settings will change. And the EQ applied may sound lousy at other listening locations. You'd have to do spatial averaging with many mic locations to get a reasonable degree of accuracy. I suggest you not use auto-EQ at all. It has the potential to reduce the accuracy and fidelity of good linear speakers like the M60s.
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Regards,
