The aren't really tune-able to a specific output.
The air being compressed inside of the box stops the woofer short, in effect, choking it.
I also heard sealed was better but after hearing a ported one that person is full of sh!t.
Honestly,
I would Never, ever, ever, never, ever eeevvveeerrr use a sealed box for ANYTHING.
I would go with a ported enclosure tuned to around 30-35hz for great musical quality.
Plus, with 4 18"s you are going to get super loud anyway.
Audiobahn made a 34 incher.
Saw one at the local trade center. The surround looked like chicken wire coated in thinned out Fiber Glass and hardly moved 2 inches peak to peak.
Funny thing is, the guy had it on display tripped over one of the mini-bikes, quads, or mopeds he sells and fell into it and put a hole in it. :lol: :lol: :lol:
Titebond. (What series/line/ flavor?)*
1 5/8" Drywall screws.
A drillbit.
And about 1 1/2 hrs.
50/50 between the two boxes still.
* Liquid Nails has Extra Strength, Normals Stregth, ETC.
AudioPipe TXX-AP15
2 15's in the back of a '94 Explorer, pre-fab box, Volvehnhag Capacitor, Lanzar Vibe "4000w" amp, and some 4 gauge wire. 139 Sealed in the kick attached to what I think is called a globe.