Hey jpk_fx,
FYI: My sub volumne is around the 9 O'clock position. If i tune to SPL meter - i would lower to roughly 8 O'clock to 7:30. Standard setup position is 12 O'clock.

If you have a THX movie - menu to the THX section. I beleive the 3rd part of the audio has a test sweep from 200Hz-20Hz. This works w/ Dolby Digital 5.1. give it a spin.

....and welcome to the Forum.
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later,
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Outlaw 990/7125, Oppo, Xbox 360, Paradigm (L/R/C), Polk (S), M&K Sub w/ SMS-1, Samsung LED-DLP HDTV, Signal Cable, Brickwall