I traded my Strata III for a Strata V a few months ago. When I tried to calibrate it instead of a continuous sound (that I got with the Strata III) I got small burst of sound as if the sub was switching itself off and then on again. Tonight I was watching Star Wars and in the intro of THX in the final explosion it's quite clear that the sub switches itself off. Could it be a problem with the sub? In the AV processor the sub is at 0dB so I think that problem doesn't come from there. The position and the cables are also the same that I used in the Strata III. Could someone shed some light?