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you'll find that if you go with an alpine type R sub, you'll be spending a bit more, but the bass will sound really crisp and good with a decent amp. A 12" with a 1000W amp and you're laughing.
If you want that massive bass, a JL audio will do it. You'll for sure notice the difference in quality between say a Sony and Alpine
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if u have got the money go the higher end JBL stuff it is great and has the smoothess bass lines and also has the punch to back it up,
but saying that im running alpine type R 12" and they are great and not to expensive either,
matt.