Axiom Home Page Forums General Discussion Home Theater how do I calibrate the sub?

I just got the digital SPL meter from radio shack and was wondering how I use it to set the right level for my sub? I don't have a test disk (adn I don't really want to buy one), I'm just using the test tone from the reciever (HK 525)..which doesn't seem to play the test tone to the sub!? Any help would be greatly appreciated.

Also, is there any good info on how to use the SPL meter for home theater set up? I read the manual, and a few tips here and there, but would love to get more info on what the heck I'm doing -- thanks!