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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1540673" data-attributes="member: 30520">If you go aftermarket, you'll need to do it 100%.  The mach speakers are a unique resistance that will overpower aftermarket amps and cause damage.  Aftermarket head unit to the aftermarket amp and 4 good speakers(or components) will sound much better than trying to make the old Mach stuff work well.Some aftermarket decks do allow for tweaking of the sound system.  I have an aftermarket head unit with the mach amps and speakers and after messing with it, it sounds ok.  Won't ever be as good as pure aftermarket NEW stuff.</blockquote>