I got an icon 12 recently, it's in a sealed box, and I Love how low it goes. If I really turn my radio up it gets Loud and sounds clean. Thing is I think I'd like some more output, but still want it to get nice and low and sound good. I listen to mostly industrial, a bit of triphop, and rarely metal and rock, what would you recommend as far as a ported box goes?

Sealed: .85 cuft

Sealed: 1.2 cu.ft. optimal

Ported: 1.75 cuft @ 27-33Hz

Ported: 2.25 cu.ft. @ 27-33hz opt.

Sub Outside Dia.: 12.500

Well I'd definitely go optimal sized as long as it fits in the trunk of my galant, one thing I was curious about is how should I tune it. What effect do different tunes have on the sound?

Well I'd definitely go optimal sized as long as it fits in the trunk of my galant, one thing I was curious about is how should I tune it. What effect do different tunes have on the sound?

It is a suggested tuning target. If you want a little flatter response go with the lower tuning, if you want a tad more output on the lower end go a little higher. But the difference in the two is not that noticable in the end.