To add to the chaos .... I prefer throwing the Video Essential disk in the DVD player and use the test tones on the disk. This way i am testing the entire audio path.
I have found a difference between the dvd player and the 990 test tones (up to a couple of dbs).

Jason J,
Thanks for the chart. good stuff.
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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