Kung

Well, I've already got an amp for a sub; all I need is the sub/sub enclosure itself, plus a 4-channel amp.

Keeping in mind that I no longer need huge bass, just better than what's stock, can anyone recommend an amp they've got experience with that will help flesh out the Alpines? If I have to get 'better' speakers in the future, I can, but I'd like to think a decent amp could help them out.

Heel70

Swapped all my factory speakers out around 2 years ago. Did a ton of research on all different brands from frequency response high / low, RMS power handling, sensitivity the whole shooting match. Chose Infinity over Polk Audio because the Infinity had a slightly better low freq, could handle more juice and had a slight higher sensitivy rating than the Polk speakers. Speakers sounded much better on the stock system and even much better once I got some decent power feeding them from an amp.

If your interested in the Infinity's take a look at the link. They sound superb and spec wise they match or exceed any 6x8 speaker out there.

http://www.infinityspeakers.com/spea...+682.11CF.html