I was under the assumption that turning up the master to 75db tells you where the reference point is at, and then turn up each speaker using the individual levels at that same master volume determined by the front left speaker. SO, my front left is going to be 0 no matter what because that is adjusted using the master....correct? Then the others are adjusted using the individual volumes from -12 to +12 db... But, since I have the master cranked up to reach 75 db, the other speakers are really only being adjusted by about + or - 1 or 2 db....am I thinking incorrectly?