Can someone confirm some number for me? 4th order

I'd go a little bigger ported if you can, like a 2:1 or 3:1 ported to sealed ratio. Port area looks ok but I got 13.4 inches needed for a port tune of 47hz. 7.3 inches puts the tune closer to 54hz.

Edit: I just realized you said 10x30 for port area, I originally thought you said 7x30 when I checked the math. That gives you 300sq inches of port which means the tune is even higher than 54hz. With a port that big you would need almost 22inches of port length to tune to 47hz. 7.3 inches puts the tune closer to about 61hz.

So the changes you need to make are making the ported side larger and slightly shrinking the port down to 20-24sq inches of area per cubic foot or make your port length longer which eats up a lot of space. What vehicle, what subs and what amp are you using?

Thanks for the reply. Unfortunately I'm limited on space. It's an ext cab truck. I have about 28 cubes gross and everything double walled. Gonna have to rethink this. I only have 9 or so inches internal to work with before the port hits the motors. Thinking 3 at the top and bottom horizontally with a horizontal port. Or 3 on each side vertically with a vertical port. 

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Should i shrink the port to 150-200 sq inches?

 

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I could always go straight ported.

 

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Ext cab Silverado

Soundqubed hds312s

Taramps 8k 2 ohm at 1.33

Click to expand...

You're going to have to drop some cone area. The only way 6 12s will fit in there is with a blow through 4th order or a standard ported box.

I'm not experienced with Brazilian amps but I wouldn't run them below their intended ohm load unless you want trouble.

6 10s is about 20sq inches more cone area than 4 12s. If you could find some 10s that like a smaller sealed box you could do .75cf per sub sealed and that would make the ported side 13.5cf for a 3:1 ratio. That's 18cf net total which allows for sub, port and bracing displacement.

You can stay with a smaller ported chamber, I'd just stick with a smaller port, roughly 160in^ and a big roundover. Will give a nice smooth response and get low.

Pics work for me. I see them

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