if you have the mach 460 system already BEWARE!, i replaced my front 6x8's with pioneer 3 way 6x8's and the regular tape deck/ cd changer head unit with an Alpine head unit, i just had CC install it for me, but even though it gets fairly loud, at about 10 (out of a max volume of 35) the bass will cut out of my front speakers and cut in and out from there on out... no one can give me any reasonable explanation out of about 4 or so shops around me... except for to rewire the system to bypass the amps, but there has to be a better way. if anyone knows my problem here, or has a possible solution, im all ears, but just make sure you know that what you replace the stock equipment will work with the mach 460 (someone suggested the ohms are off, but all 6x8's offered out there or in crutchfield are the same ohm rating)