Help adding aero ports please

[hornedfrog1985 5,000+ posts]

Ok, I'm terrible at math, and I need someone to help me just make a box I have that is currently sealed into a ported box. I know that sounds like a bad idea, but I'm just trying to make it louder so I can sell it locally.

The box I have is 4.0 cuft, and it has 4 12" id oems in it. They recommend ~1.2 cubes for a small ported box, so I figure what the hell, give it a go. Again, I just want it louder so someone might be more interested in it locally.

I just want to know what length ports I should use,how many, and what size. The box is 54Lx19Tx11D I believe. Any help would be cool...

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[302yota 10+ year member]

the box is gonna be on the small side for 4 12's.....once you figure in sub, port, and brace displacement you're prolly gonna have around 3 cubes to play with....you will prolly acheive better output while only using 2, maybe 3 subs in that box.....but we would have to know what frequency you want it tuned at, before we gave you the port size and lengths

 

[hornedfrog1985 5,000+ posts]

Oh yeah. ~32 hz. If it's easier maybe up to 35?

 

[302yota 10+ year member]

well let's say you use only 2 12's.....if you were to use two 4" aeros around 14" long that'll get you right around 33hz....and after port and sub and whatever kinda braces you use, you'll probably be around 3.5-3.7 cuft...which should be good for your 2 12's...just sell the other two subs seperately

 

[jdawg 5,000+ posts]

http://www.psp-inc.com/tools.html

box is gonna end up pretty small though

 

[hornedfrog1985 5,000+ posts]

I know it will be pretty small, but if it's louder and doesn't sound like complete *** I can get it sold a little faster probably. I know that sounds stupid, but...

 

[hornedfrog1985 5,000+ posts]

When I put in these numbers I get...

Volume of box in cubic feet 4.0

Tuning frequency 32

Port diameter 4"

Number of ports 2

Flare length port required 14.6099375

Straight length port required 13.6099375

Does that mean I would need 13.6 long for each of the two ports, or just total?

 

[mazdakid 5,000+ posts]

That would be 13.6 each

 

[302yota 10+ year member]

i wouldnt suggest running more than 2 subs in that box though.....you'd be better off selling the other two while running 2 in the box..