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Round Ports


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6 replies to this topic

#1
manofsteel

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I have always done slot ports when building boxes and I use the rule of thumb of 12-16 in2 for each cubic foot. I generally stay around 13-14". I want to use round ports and haven't found any good information on them. I am not going to use aeros, just black pipe with rounded edges. The old school rule that I remember is to use a round port that is 1/3-1/2 the diameter of the driver, regardless of box volume. I have heard that I should use the same area as a I would use for a slot port and I have also heard that I should use slightly less area than a slot port but was never told how much less. Anyone have any input on this? I am working on designing my system and box so I am looking at all my options. Thanks. My goal is not all out SPL. I guess I'm an SQL guys. I want it to sound good and loud. I like deep bass. I'm considering using either four 12's or two 15's and pushing them with around 1500 watts.


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#2
Aaron Clinton

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I wish I could help, I have always done slot ported.  There are online calculators for round or areo ports.


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#3
manofsteel

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Thanks, same here. I have a few calculators saved on my favorites and I could download winisd again. I am going to use two Sundown E15's in my next system. I thought I might need to save a little airspace with the round ports but I don't think it will be an issue. I ordered my deck today, just getting ready for everything else.


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#4
manofsteel

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Just thought I would share this. From everything that I've read about round ports, this is what I've got. A round port should be 1/3 to 1/2 the diameter of the driver regardless of the size of the enclosure. For example, a 12" sub should have either a 4 or 6" port. An 8" sub should have a 2-4" port. I can't say for sure that this is 100% accurate, this is just what I have picked up from different sites. If anyone else wants to add something, feel free. And if I'm wrong please correct me, I don't want to give out incorrect information.


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#5
Aaron Clinton

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There are rules of thumb for a reason, but port mach needs to be taken into account.


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#6
manofsteel

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I still use Winisd to help me design my boxes, the port mach speed is a great feature on there.


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#7
Aaron Clinton

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I need to get my old Dell back up and running to be able to mess with L.E.A.P. more.


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