Interesting. I had set the crossover (on the receiver) to 60, based upon some things I've read regarding the ability to perceive direction/location between 80 and 60, coupled with the M60's ability to crank out to lower than 60Hz. Guess I'll just play around with it some more.

---- A Woofer in Tweeter's Clothing... M60s, VP150, QS8s, EP350 Onkyo TX-SR702, Denon DVD-3910