When I first received my SV, the only calibration discs I had were the Sound and Vision disc and my trusty Pink Floyd disc (The Wall). I have been using the Floyd disc to calibrate for years now and I always get good results. I recently picked up the S&V disc, mostly cause it was $14.99 and also because I wanted to double check my levels, video and audio. While i have been very happy with the video portion of the disc, I think the audio portion stinks. Using the S & V disc to set subwoofer levels, I was unclear whether or not to use a 75db scale or an 85db scale. I decided to use 75db because I had to crank it all the way up to -22 on my Yamaha just to get 75db. I wasn't comfortable going any higher for fear my front speakers would suffer the consequences. I set my sub to 81db and sat down to have a listen. No bass. I then popped in my Floyd disc and followed the calibration instructions. 85db for mains, 89db for the sub. And then there was bass. Out of curiosity, I put the S & V disc back in and checked again. It said I was 10db hot. At least thats what I could guess because the needle on the meter was jumping all over the place. It wasn't quite pegging on the 80db scale, but it was very close. Needless to say, I stuck with the levels I set using the Floyd disc. Yesterday, after waiting 3 weeks, my rented copy of Video Essentials showed up from Netflix. I was anxious to see what I was actually set at using a "real" test disc. When I got to the subwoofer calibration portion of the disc, the needle gently swayed back and forth, peaking at 81db. I don't think i'll be using the S & V disc for audio anymore.