Can someone please explain to me in laymans terms how to understand what the Dolby Reference Level for my Home Theater should be. I have a RCA Home Theater in a Box system and the volume goes from 00db up to 120db. I usually have it set around the 55db to 65db range when watching DVD's and around 25 to 30db's when watching tv. I recently bought a Rat Shack SPL Meter, but I don't have a calibration dvd as of yet. I am using the tones on my receiver to set it up for right now. What should I have my master volume set too to set the speakers up? I used 75db but have read all kinds of different settings and cannot figure out where to have the master volume set so I can get my speakers to 75db on the meter. Any help on this would be very very very appreciated. Thanks guys.