How to calculate round port to slot port? Or horn options? - AVS Forum
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post #1 of 4 Old 12-02-2012, 10:21 AM - Thread Starter
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Hi all, I am building a small subwoofer for my car. I am thinking of using a Rockford Fosgate 8" P2D2-8 DVC 2ohm. They recommend a .64cuft box with a 8.8" x 2" port. I would like to make a slot port but don't know how to do the calculations to create the right dimensions.

Also, if a horn can be made off this drive and can keep the box relatively small, that might be even better.

I am replacing dual 6x9 "subwoofers" in my car. The magnets on the drives state 2ohms and 25watts. They really suck and don't produce much bass. I am trying to run this new sub off my stock amp.

Any help would be appreciated..

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post #2 of 4 Old 12-02-2012, 10:37 AM
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It's all about surface area. The port opening can be pretty much any shape as long as the surface area of the opening is the same.
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post #3 of 4 Old 12-02-2012, 01:47 PM
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Thats true, just beware that very narrow slot port will most likely lower the tuning some, and chuffing may occure.
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post #4 of 4 Old 12-02-2012, 02:25 PM - Thread Starter
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Yeah, that could be a problem.

I am limited to a 2ohm DVC design because i am sticking with the factory amp. Is there a design out there for a very efficient small subwoofer that I can use a 2ohm DVC drive with?

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