Running my system analog direct vs. stereo (utilizing the sub and 80Hz XO) on CDs creates this anomaly that I am talking about. Equipment: Receiver - Integra DTR 7.1 Speakers - PSB Image 4T Sub - Paradigm PW-2200 When I run a signal in DIRECT mode (bypassing all) from my CD player, I am getting a distinctly fuller sound. When I run the same signal in STEREO mode (cutting mains at 80Hz and redirecting below to sub), my sound is less full...but the lows go deeper. My mains play down comfortably to 40Hz, but my sub plays to 20Hz. I have calibrated my sub to blend as well as I can at the 80Hz crossover point, yet my mid-bass seems lacking when using the STEREO mode. What is probably happening? Do I have a hole, or are my speakers exhibiting a hump in my room in the upper/mid-bass range that is eliminated by the use of a calibrated sub? Just curious...as this does not make much sense to me. Thanks.