...and jono, dcg71 and dabaitu are correct. They are under the front seats.
Well, just got home 10pm and took a look and saw a black grill in the floor under both seats. However, i dont think that's where the sound is coming from. Seems to be emanating from within the seats.
Anyway, no vibration was coming from the black grills so i chucked in a black eye peas CD and.... WOAH!!! How AWESOME is the HiFi system???? The bass is rich and undistorted!
I am very impressed! HK must be a step up yet again.
So with the BEP CD i think the vibes are coming from within the seat than the black grills.
I will verify with the dealer. I want to talk to him about my sports readout
Oh and sorry no pix... Got home late