Hi Undecided5,
The Sound&Vision Home Theater Tune-Up DVD is much easier to use than the Avia disc, and less expensive as well. I think it's about $16 at Amazon.com. It has lots of excellent subwoofer/satellite calibration tests. Get it by all means, and the Radio Shack SPL meter (analog version), otherwise your settings will be all over the place. And yes, using the DVD and the meter, you should arrive at a subwoofer setting that will suit most movies and much of your music, apart from actual differences in the deep bass levels of the program sources. Those may vary quite a lot, but you can trim the sub volume when required.
Don't forget to experiment with subwoofer locations as well.
The S&V DVD also has plenty of video calibration tests to properly set up your TV monitor.
Regards,
