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bman8891

(2) xl12's box as backseat port help

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Heres my box I need help determining port size and length. Id like to tune it to around 30 ish for daily. The subs will be inverted so there wont be displacement for them. Id prefer tito use aeroports so i can adjust the tuning if I need to. Subs will see around 2k each. Any help would be great!

Edited by bman8891
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Okay I did that and here's what I came up with. Do y'all think this will work?

Yea the boxes I've done with areo ports are 9-10inches port per ft with great results. I say yes to the 6" areo

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Nowhere near enough port area IMHO. Even two 6" aeros would be a bit on the small side.

If I did that it would be over 20 square inches of port per cubic foot and my ports would have to be like 6 feet long. Remember how small this box is everything I've seen says 1.5-1.75 per xl12.

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If I did that it would be over 20 square inches of port per cubic foot and my ports would have to be like 6 feet long. Remember how small this box is everything I've seen says 1.5-1.75 per xl12.

Your box is a perfect example of why "port area per cube" rules don't always work out. I've built plenty of boxes with over 20 sq in of port per cube, it all depends on what the application requires. You are going to be putting 4k watts into this box, that's going to move some air and you need to facilitate that or your output is going to suffer significantly.

To put things in perspective, Sundown recommends 40 sq in of port area per sub for their Zv.4 12"s. A single 6" aero port is 28 sq in, so you have 14 sq in per sub. Does that sound like a recipe for success?

I know there are other people here who are saying they've run similar setups with a single 6" aero, but here's the problem, how do you hear the output you aren't getting because your port is too small? You can't. Port compression isn't always audible, but you would sure as hell hear the difference if it wasn't there.

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I understand well physically 2 5" aeroports is about as much as I can fit that would make the box 3.3 cubes and give me 11.9 inches of port per foot with 39 square inches of port area

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I understand well physically 2 5" aeroports is about as much as I can fit that would make the box 3.3 cubes and give me 11.9 inches of port per foot with 39 square inches of port area

Well that's better than a single 6" port, but is still significantly undersized.

Have you built this box yet? Is it possible to just make the box bigger so you can use the proper amount of port area?

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