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Old 09-07-2014, 09:40 PM
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Default sub mounting location

so i'm looking to build a new box, and i'm curious, if say i'm running 4 12's, and 2 12's are mounted on the top of the box and 2 on the sides... will it work? or am i going to face some serious cancellation?
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Old 09-07-2014, 10:06 PM
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and basically i'd have 2 on the top of the box and two on the face side, its going in an ext cab truck, so to subs firing up, and two firing at the back of the seats...
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Old 09-07-2014, 10:08 PM
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My buddy did this with his car and he had so cancellation and loading issues. Since it is an extended cab truck, is it possible for you to put the on the top side to side?
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Old 09-07-2014, 10:15 PM
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i guess i could do all subs across the top and port out the side....
didn't really think of that, but then again, the port will have about 3 inches blocked off because of the way the c pillars come down on the the truck...
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Old 09-07-2014, 10:22 PM
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Yes it will work, no you won't get cancellation. The general rule is that as long as the speakers are spaced within 1/2 wavelength you will get some form of constructive interference, the closer the better (at 1/2 wavelength the positive cycle of one speaker is being cancelled by the negative cycle of the other speaker). As an example, at 80hz the wavelength is about 14ft, so you would want to keep path-length difference between you and each sub less than 7 feet. As you get lower in frequencies the allowable PLD becomes larger because the wavelengths are longer, so it's fair to say that it's going to be really difficult to get true wave cancellation at bass frequencies in a car.

There will definitely be an effect on the overall modal response though. I doubt it will be detrimental.

edit: I didn't read that this was going in a truck; I though this was in a car trunk. If that's the case then you might have issues. Truck cabs are almost like tiny cubes and tend to get weird modal issues.

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Old 09-07-2014, 11:03 PM
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i guess i'll just stick with 2 15's in place of 4 12's. otherwise i'd have to run areo's and do sub forward port up...
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Old 09-07-2014, 11:14 PM
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i guess i'll just stick with 2 15's in place of 4 12's. otherwise i'd have to run areo's and do sub forward port up...
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