P.bass on mid, all others flat. Centered f/r & l/r. Sirius 21/24 screams just nicely to about 20 or so, then it's just noise. The higher P.bass setting is to compensate for the absolutely piss poor Sirius signal... sounds like a low bit rate rip running through a soup-can-and-string. Oh, wait... it IS a low bit rate rip... so I'm half right.