How did you measure them? Reason that I ask. I can play the Black Hawk Down helicopter scene with the 7 seconds of 7hz material at reference level in my HT and my uncorrected Radio Shack Digital SPL meter gives me a max C scale fast reading of 114db at the listening position. Now if I add the +20.5db correction factor (10hz) for this meter http://www.hometheatershack.com/foru...s.html#post363, I get 134.5db at 10hz. I do have a pretty nice subwoofer system, but I do not have a pair of Matterhorns. This is why I do not trust RS SPL posted readings. For the record, my system measures flat to single digits using REW and a calibrated mic.