oh you also need to make sure you get a competent amplifier. i mean you can have the best subs in the world but if you dont have something awesome pushing them, nothing is going to happen. so far pairing an alpine mono amp to a jl sub has worked wonders for me. but you can also try something like an mtx amp with the jl sub.
oh and just so you know its not all in the subs. the mid woofers are the ones that do most of the work as well. so if you have some nice 6x9's in the rear set at full range with a nice amp and some components up front set at full range with the right frequency....you should have yourself an awesome system

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