The MACH 460 system will probably damage those JL Speakers. You will want to bypass the factory amps. The frequencies provided by the factory amplification in the Mach Systems are not friendly to aftermarket components. The 4" speaker there uses a far wider frequeny range than most tweeters can handle, until you step into the Morel, Dyn Audio range, in which case the tweeters alone would retail at 200+ per pair. Same with the 5x7/6x8 midbass, the factory 5x7 woofers in place play a frequency range which extends far lower than the JL C series can handle at that power for long periods. You need a plain old full range signal from the radio, or a crossed over signal from an external amp to go into the crossovers that came with the speaker set, and then output from the JL xover to the components. No after market speakers are going to produce as much bass as the stock 460 5x7. They are not designed for it. Unless you want to spend 400+ per set....
Grabber Blue "Betty" 2012 V6 Six Speed, 3.55, BBK cai/throttle body, longtubes, x-pipe, axle back w/oem tips, Lugo Performance Dynotune, Zex 100 dry. I need factory v6 foglight housings, and the stock 11/12 gt grill with the light housings.