If you have a Mach 460 it's pretty obvious, heh. They're right there on the rear deck or whatever you call that. Unless you have a convertible where it's behind the doors.
Oh, I saw it...thanks! So do I need to take off the plastic piece on the back/top of the rear seats to change them out? Here comes Infinity KAPPA's...OOHHOOOW!
Oh, and I have heard that the 460 is just like the base, but with some more bass...God that must suck. I do consider myself lucky, as everything is easily changeable, not having to change everything out; just to change the speakers, lol!
However, MACH1000 sounds pretty damn good IMHO, I wouldn't mind that one at all!