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Message: <blockquote data-quote="shovel" data-source="post: 1590115" data-attributes="member: 29855">You can use any 2 channel amplifier with an adjustable LPF to drive the factory mach woofers but it requires knowing a thing or two about how audio systems work and how the mach system works in particular ..  which unfortunately most people don't.Instead of that, the best possible thing to do is delete every trace of the Mach system and run component speakers either directly from the head unit or an aftermarket 4 channel amp if you really need more muscle.  Bypass (and remove) the under dash amp, the harness is all there and easy - the door tweeter wires can be commandeered to run door components so you don't need to run any new wires.   Do not reuse the Mach woofer wiring,  just tape it off so it doesn't rattle or remove it entirely.</blockquote>