I bought the Sound & Vision test disk, along with the Radio Shack digital spl meter (they don't carry the analog ones where I live, but I was able to get it on sale for $45 Cdn, which is half price ). I set up the spl meter on a tripod in my usual listening position(C weighting, slow response). I turned off the active EQ and speaker EQ on the receiver. To get 75db on the test tones, my receiver was set at -12db(0 being the loudest). I set all the speakers to be at 75db. For the subwoofer, I left the receiver's subwoofer setting at 0 and increased the volume using the subwoofer's own volume knob. Using this method, I set the subwoofer's volume at 80db. After doing this calibration, I think that my system sounds much better, even though my wife can't tell the difference. But, from a technical point of view, have I done the calibration properly, or have I missed any steps? Any feedback would be appreciated.