I have had bass issues with the BDP-83 as well. I ordered an SMS-1 before the sale ended and it should arrive tomorrow. That's a pretty expensive fix. The problem with boosting the bass at the sub is that it is then throws off bass for other sources, like tv/cable.

One thing I noticed was that the BDP-83's bass clearly was off when I used the AIX calibration disk. But I'm not sure it's that far off when I play a DVD. That leads me to wonder whether there is something about the calibration disk that is strange.