Okay, but you people are arguing that with a DMM you are setting them to precision. "You can't argue with physics" well, you aren't using flawless methods. 100 bucks says one day you put a song in there that hits harder than that one. It doesn't have to be a continuous beat, but it just has to hit harder in parts.You can't possibly tell me that you know the frequency of your "song" will affect the other sub bass frequencies properly.
Also, what bout a front end amp? Am I gonna put a song in my 3 front stage amps that will play a continuous voice? or drum constantly playing.
I'm just saying, unless you set your gains with a DMM alll the way, using all the proper methods, you might as well not bother. you will either over drive your amp, or never get to hear it play it's potential.