I have pioneer head unit, a 5ch500w amp mounted under seat. I also replaced all the speakers with alpine component speakers and ran all new speaker wire. For the sub I run a 10' I had laying around in the garage for now, but I want a get a quality 8" sub to fit in the factory enclosure.
No need for poly fill in the soundbar especially with the component speakers, which are much better then 2 or 3-way speakers and are same price. (Don't buy speakers cuz they look pretty)
I only dyno matted and polyfilled the factory sub enclosure and that did help a lot with vibration and sound for the subwoofer.
I had this in there for a while, it sounded good but didn't last very long. Everything was correct as far as all the specs go.
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It was wired this way.
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Crutchfield took it back for a full refund with no questions asked.
I wan to get this JL sub now, which I heard great thing about
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It's a Jeep you will never get the sound quality you would have in a regular car. And I personally don't want to drive around with a big sub in the trunk once again because it's a JEEP. Also once you take the top and doors off all the base escapes anyway, cuz all pressure escapes.
Also cool trick for fitting aftermarket tweeters in your factory front housing. Toothpicks and hot glue lol.
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I added rear teeters on the sound bar also, just had to drill couple holes in it, tweeters will come with everything you need to mount them in a sound bar and there is plenty of room for them.
You want to have good sounds, get a 5ch amp, stay away from 2 and 3-way speakers cuz they are crap. Run all new wiring. Get quality head unit that uses RCA's to connect to your amplifier. Also if you want to keep your steering wheel controls get Maestro module, which also taps in to obdII and allows you bring up gauges for trans temp, intake temp, boots, vacuum etc.... it even will scan for check engine light and show you the codes all from the head unit.
That is how I have mine set up and I love it. Even with the top and doors off, it's still loud and clear!
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MY BUILT/REBUILD:
http://wayalife.com/showthread.php?44123-Rebuilt-of-a-Billet-Silver-mall-crawler&p=859931#post859931