Soundhound, thanks for the link. I remembering reading it but could't find it. Just finished re-calibrating my system using your advice. Still messing around with the sub's trim. Never really had a center channel "muddiness" like the original post, but was surprised how different the two types of test tones were in calibration. And with so many responses about calibrations I thought maybe this could help the original poster and improve my set up. Thanks again!