PA Sub's with Triangle Ports - Why??? - diyAudio
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Old 13th June 2014, 12:17 PM   #1
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Default PA Sub's with Triangle Ports - Why???

It seems more and more PA subs are using triangle ports. Is this just a fad, or is there a real reason that makes triangle ports better than circular or slot ports?
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Old 13th June 2014, 01:12 PM   #2
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With designs that minimize the baffle size it's the most effective use of space and the port wall also serves as a brace for the baffle and the two enclosure walls it intersects with.
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Old 13th June 2014, 03:26 PM   #3
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In addition to Conanski's points the use of the wall also lowers tuning slightly over a circular port of the same area and length, reducing the internal volume sacrificed for port area.

Triangle ports are no fad, and have been used for many decades, though as long excursion drivers become more common, the larger port area required has been making them more common.
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Old 13th June 2014, 03:49 PM   #4
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If you could, please check out the subwoofer designs at the bottom of this page.

B&C Speakers

The B&C speakers used in these designs are high wattage/xmax drivers, which I would expect to need huge ports to function to their fullest extent.

These B&C plans only use two 5-6" triangle ports though. Most subwoofers of this caliber that are slot ported usually have a 4" high port the full width of the cabinet. These triangle ports seem to have a much smaller port area, which would seem to be unhealthy for high wattage/xmax drivers.

I can see the points you made above about the benefits of triangle ports, but are these ports used in the B&C designs adequate?
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Old 13th June 2014, 05:48 PM   #5
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Quote:
Originally Posted by DJCRAIG View Post
I can see the points you made above about the benefits of triangle ports, but are these ports used in the B&C designs adequate?
The port volume on the S18BN does seem marginal, I used more than double that volume when I did comparisons of the BC18SW115 in ported and TH cabinets, and there still was some port compression at around 1700 watts. You could model the cabinet and see what the vent air velocity is, 15 meters per second or less seems OK to me at full power.
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