My head unit is Eclipse, which sounds great, but I don't recommend Eclipse since their products fall to pieces after a while and their customer service sucks balls and both my retailer and Eclipse CS have given me the runaround. For the money I spent, I'm heavily disappointed, so save your money and aggravation and stick to Alpine. I've never had to call their customer service and their product is flat-out better.
As for "bass trap" in the trunk, Lincolns and even Raddleacs, I mean, Cadillacs are built for comfot and quiet; so they feature sound deadening and heavy matting to drown-out roadnoise. But with the right setup, your system will slap no matter what. I had the following system in three Lincoln vehicles and each slammed to hell!
For an amp, I use the
JL Audio 500/1 mono amplifier centered @ 80hz, for the booming bass. These are now availible in chrome and look evil!
For a sub, I use a single
10W6v2 in a tuned slot-vented box. The combo slams like all hell broke loose.
Here are
my amp settings, as I followed from JL's site. The rest of the speakers/ amp system is stock and replacement JBL.
The whole combination of subs, amp, and woofer cost around $1,000 total. I installed everything myself. This system slams for all types of music, but you can definately appreciate the extreme shake made from rap music. I think you'd be happiest with this setup.
BTW, alot of people laugh and call JL "overrated"; if you hear this from some pimple-faced ricer or some know-nothing Best Buy/ Circuit City sales-idiot tryin to push you that Fosgate, JVC, Sony, or Lightning Audio trash, bitchslap them and then go out and crank your JL's. You get what you pay for...