This Sub box Ported Alpine is the one. Kick butt sub and it dont have to be 12 or 15inch any more. You can run this sub straight off your deck speakers if u have an amp already installed. I ran mine off a boss100 watt amp sounds insane in my 2002 lz , i wanted to hear it, not the neighborhood.. This is a great buy. They are 300.00 on alpine website.
For what this is, the sub gets pretty loud. It gets alittle muddy at higher volumes but does the job. Overall im very happy with it and after letting my co worker hear mine, he got one as well. Alpine always makes great products.