I need box help bad

[Buck 5,000+ posts]

ok. I need plans to build a ported box for 4 12" subs. total airspace needs to be about 6 cubic feet total (1.5 per woofer). tuning about 30hz. But I only have this much room to work with max:

55x14x21(could possibly go higher than 21)in.

This is going to go on the rear seat of an f150 extended cab.

I would really like to see if this box is possible because if it is I am going to build it.

Any help greatly appreciated

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[jmanpc 5,000+ posts]

go here:

http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

type in 55, 14, 21, 21, .75, 6, 4.

Comes out to 6.3 @ 30. Looks like you're in luck.

 

[jmanpc 5,000+ posts]

edit: double post.

 

[Buck 5,000+ posts]

**** that badass i really appreciate it. I have one question, how in the hell do they figure out how to make the port to a certain frequency?

 

[jmanpc 5,000+ posts]

its a mathematical equation about the width of your screen.

 

[Buck 5,000+ posts]

oh shit. and one more question. Can I mount the subs in any place on the box? cuz i want them firing towards me instead of upwards

 

[jmanpc 5,000+ posts]

Yeah, that'd be fine. Probably your best bet, in fact.

 

[Buck 5,000+ posts]

why would that be the best bet? just asking cuz idk why it would be other than the looks and the bass pointing towards me