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sizing the proper box

Old 08-31-2012, 10:30 AM
0 Watt CAFz'r
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Join Date: Jul 2009
Posts: 17
sizing the proper box


I am going to be building my first box but have background in carpentry so don't believe the construction will be my issue. I just have never had to design one before. I have 2 x JL12W7 and will be placing in the blow through in my dodge Dakota. I have already cut and installed the boot in the truck.

My question is that because i have so much room in the back of the truck I want to build a ported box that will be facing forward with the subs and ports. Looking at the JL recommended enclosure size it should fit fine but i didn't know if i should be building it bigger. My goal is to have it hit some really low frequencies. In addition the front of the box will have the subs facing forward with the ports vertical in the middle but then the subs would be pushing directly toward the back of the cab and not the cutout, would it be ok to angle them a bit toward the middle or would that interfere with the air movement from the port?

Any thoughts would be greatly appreciated. Thanks.
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Old 09-01-2012, 10:06 AM
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Join Date: Feb 2006
Posts: 16,855
If you are inexperienced at box design then use JLs specs for volume.

I would place the woofers and vents like this \_/ with a woofer on each side and the vents in the middle, all firing towards the blow through.
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Old 09-23-2012, 01:12 PM
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A truck blow through is typically not a standard ported enclosure but rather a 4th order bandpass or my favorite a 6th order. These are IMO superior in design but not for someone new to building enclosures. If you want I can put you in contact with someone that will design you a great enclosure and provide you with a blue print of sorts for a small fee. Its well worth it.
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