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  #1  
Old 10-18-2010, 12:32 PM
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Default box problem



so i built this box the other day for 4 polk dxi 12's, its not very loud, and the subs seem to be bottoming out very easily....

its right about 5.5cf with 70sq" of port, should be tuned to 33hz

my question is could the rear two subs be unloading because they are like 1/2 way over the port?

or any other idea's on why this box blows
p.s. i put 2 of these 12's in my friends truck in 2.55cf tuned to 32 and its really loud
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rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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Old 10-18-2010, 12:41 PM
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My guess would be the two subs that are half way over the port.. They are possibly "unloading" where the other two have the port board to load off of.
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Old 10-18-2010, 12:43 PM
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5.5 cubic feet for 4 12"s seems really small....
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Old 10-18-2010, 12:49 PM
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ik its seems small, box requirements says .8cf sealed, 1.5-2 ported, im just above 1.25 so i would think it would be ok, and my friends that are in 1.25 each are much louder than my 4 off 4x the power, and his hits WAY lower than mine

any idea's on how i could fix this loading issue? could i just put a piece of wood a little longer than the diameter of the port as to not affect tuning or would it either way?
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rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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Old 10-18-2010, 12:52 PM
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I would let me help you with a new box design....
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Old 10-18-2010, 12:58 PM
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well its not really a new design....
that is how the box has to be to fit, i could just extend the port a bit and make a 2nd port length below that row of subs to give it something to load off but im loosing area, and lowering the tuning even more
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rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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Last edited by tymoto21; 10-18-2010 at 01:03 PM.
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