Hello. I have Sound and Vision's calibration DVD, as well as Explore Our World from Dolby. Sound and Vision's test tones are basically the same as Avia's, and Dolby's disc uses pink noise, which is basically the same as what is output by my receiver. So, the $64,000 question is; Which test tones are more accurate? I'm getting different readings when calibrating both discs to reference... Anyone know?