I did mention somewhere on here before if someone hasn't got a capable centre speaker or the sub isn't setup in their system properly they'd wonder where the bass got to on some tracks as a lot of that doof-ing is in the centre channel..!
Edit: It reminds me of that Paul Van Dyk DVD (not the SACD) which is in 5.1 with a lot of doof-doof-ing etc in the centre (what's it called again? Mike? Help!)
I have my speakers set to small and everything below 150 hz goes to my sub so maybe the doof thing sounds less disturbing on my system because of that?