I'd also agree with getting a better head unit. As long as you don't spend too much on the headunit, that still leaves you plenty of room to pick up some decent woofers and stay well under your budget of $500. In fact, you may even be able to squeeze in a self-powered sub or some tweeters.
If you want a passive sub, I think you'd pretty much end up blowing your whole budget on getting a decent sub, enclosure, and amp.
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