Hi Grant,
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It all depends what you're after, and what your budget is.
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If you're after sound quality
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(SQ), then a good set of 6.5" components
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(6.5 inch bit goes in the doors, tweeters go in the little triangle bits) and a 10" subwoofer driven by either a pair of 2 channel amps
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(bridge the second for the sub), or a 4 channel amp
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(again, bridge 3+4 for the sub) will do the job nicely.
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If standing outside your car with enormous ear bleeding amounts of bass is your thing
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(Sound pressure level
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- SPL)
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(why!!!
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) then you'd be better with a couple of 12" subs and big amps to drive them.
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Your box needs to be the right size for your sub, the manufacturer will give a recommended sealed or ported enclosure size and you need to get that volume to get the correct response from the system.
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A worthwhile investment is soundproofing.
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.
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.
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a bit of a PITA to do, but cuts out that road/engine/exhaust noise
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(if you want to hear your exhaust, open the window
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)
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I've gone for a SQ system, with a Becker Mexico Pro head unit, Becker CD changer, DLS A5 3 channel amp, Focal Utopia 165 components and an Aliante 10si sub.
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Not fitted it yet!!
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This forum is very useful:
http://www.talkaudio.co.uk/
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Cheers,
Jon