Using the S&V disc I calibrated everything to 75. I later read on HTF that the company who developed the S&V disc, Ovation, also made the AVIA disc. I've never used AVIA but apparently the instructions on that disc call for an 85db level. The S&V disc makes no mention of what level to use. I know the Video Essentials disc calls for a 75db level. It probably doesn't make a huge difference but if I'm going to take the time to calibrate I would like to do it as the developers of the software intended.