i just got my first real 5.1 surround system (HTD Level 2). I'm just wonder how much sound typically comes from the rear surrounds. I've calibrated my speakers with a Rad Shack SPL meter. However, it seems like most of the sound is always coming from the front speakers. The surrounds are definitely working, as sometimes I can the sounds which are intended for the surrounds perfectly. However, it just seems like most of the time the sound is coming from the front 3 speakers and the subwoofer. Is this normal?