I think this is probably quite a noobish question but i searched and couldn't find an answer. Does volume correspond to watt output or decibel output? Reason i ask is im worried ill blow my speakers if i go above -50 which is the same wattage number im told are my surround speakers. Center is 70w with 100w max, 8 ohm. Surrounds (i think are) 50w, 8 ohm. Subwoofer is active 150w. Sound seems a bit quiet at -50 when watching dvds, especially voices but sky seems about what i should expect. One more thing i find is the sub seems really weak, i can hear it but just cant feel it which i thought was one of the main reasons for a sub? Thanks for any help!