You notice no difference with and without the sub? Something sounds wrong then.

is the driver moving? If you put your hand on the surround you can easily tell if the driver is working, even at low volumes.

Did you take a walk around your room to see if the bass re-appeared? The room can have a large effect on bass frequencies and it may be that your listening position is in a large bass null.

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!