You set the front left to 0, play the front left test tone while increasing the master volume until your meter reaches 75dB. Then as you cycle through the other tones you adjust the speakers individually so that each of those test tones registers at 75dB. At this point, whatever master volume setting you were at is the reference level.
So, your front left will be at 0, correct. The others may require more than a +/-2 dB change though because they may be further from the sweet spot, angled differently, or have some odd reflecting properties due to things in the room.
Last edited by ringmir; 04/22/04 08:36 PM.