thanks michael! on 2nd attempt put in a lord of the ringd dvd, cranked up the level & it's thumping fine. after some ajustment, got it working with cd also. moved back to the coax across the room, and it's fine.
this is my first sub, but it seems great & adds a whole new dimension to watching a dvd, or listening to music with a lot of bass, or drum beat.
thanks again! Merry Christmas!