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Message: <blockquote data-quote="carbuff" data-source="post: 1452584" data-attributes="member: 17578"><p>So, my 2001 came from the factory with a double din mach 460 system. The guy I bought it from replaced it with a single din sony head, mex-5100bt. Its a decent enough unit with tons of options. But to me it sounded a bit wimpy. No real bass to speak of. I looked at some youtube videos of mach systems and how to wire them up with a new head unit. I saw that you needed special harnesses and a resistor for the amp trigger and all. I figured that the guy must have just used a basic harness and somehow bypassed the amps, as it sounded like all frequencies coming from all 8 speakers. So I pulled out the deck and to my surprise it looked like a nice job with all the right harnesses and proper resistor for the amp wire. No butchered wires. Then I noticed that the phono plugs that are supposed to be plugged into the sub-out jacks are plugged into the rear speaker jacks. I switched them to the sub outs and powered up the radio. Only music from the small "tweeters" but nothing from the 4 subs. I navigate the head menu and find the sub out switch and set it to on and turned up the dbs. Well lets just say that theres plenty of bass now. The amps in the trunk actually get warm now so I guess theyre working. Its interesting that the amps are just for the 4 subs and not in stereo and only handle the bass. The rest of the sound comes from the 4 little speakers. It sounds much better and I guess I need to tweak it a bit. I hope the sound does not get lost with the top down.</p></blockquote><p></p>