I'm going to be getting one of the well-known Radio Shack SPL meters and I have the Avia DVD for Dolby Digital reference DVD calibration. I was wondering if someone could please tell me what, if any, correction needs to be applied to the dB readings on the SPL meter when calibrating the main speakers, as well as the surround speakers when using Avia. I know that the SPL meter has a certain insensitivity to bass frequencies, and thus corrections need to be applied when calibrating a subwoofer. But we don't have a subwoofer yet, so we'll just be dealing with the main speakers and surrounds for now. What frequency are the notes played by Avia for Dolby Digital DVD reference level calibration of the mains and surrounds, and is there any correction needed to get accurate readings when doing the calibration? Also, what settings should the Radio Shack SPL meter be set to when calibrating the main speakers and surrounds with Avia to get accurate readings? Thanks for any help!