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Ported 12" PA Cabinet Design
Ported 12" PA Cabinet Design
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Old 1st April 2017, 05:38 AM   #1
Supertzar is offline Supertzar  Canada
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Default Ported 12" PA Cabinet Design

Hi everyone, I'm looking for some advice on a speaker cabinet plan I just whipped up. Although this cabinet is intended for guitar use, I decided to post here as it is really more like a PA cab. I designed the cabinet in Boxnotes, then modeled it in WinISD. The speaker is an Eminence EM12, the volume is 1.49 ft3, and there are 2 2" diameter flanged ports. WinISD says the cabinet should have an f3 of about 72 Hz. Does anyone here have experience with these two programs? Do these numbers seem about right or are they way off? This cab is my first design, so it's really a shot in the dark for me. Any advice is much appreciated!
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Old 20th December 2017, 07:31 PM   #2
Jsixis is offline Jsixis  United States
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winisd has been right on the money for me IF you build the cabs like they say.
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Old 29th December 2017, 12:54 AM   #3
Supertzar is offline Supertzar  Canada
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Thanks Jsixis, I agree. I did build the cab to WinISD's specs, although the port opening ended up being a bit smaller during construction and the box volume wasn't exact. It performs really well though, and it has sufficient low end response for bass guitar
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Old 15th January 2018, 06:51 PM   #4
Jsixis is offline Jsixis  United States
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That has been my experience and I have built at least 2 dozen boxes varying in speaker sizes 4" full range to 15" with winISD, even sent them a couple of 20 bucks have a beer on me and thanks for the awesome program.
I have built PA and home stereo speakers.
When I first starting using it the bass curve was scary but one of my first builds was a 4" full range and with a fs @ 100hz I still heard plenty of bass.

For PA /bass rigs
I like the eminence Delta 10 for a small bass cabinet in a 2ft ported box.
The Alpha 15 works great in just about any closed box design. You can really squish it in a small box but it has to be no ports if you try to port the Alpha 15 it takes a huge box.
I prefer the delta 15's with ports for stage use. I buy kustom monitor cabs for the box and replace the woofer with a The Delta 15 and it makes the cheap monitor becomes an awesome monitor at 100db at 1 watt.
I will be working upgrading a pair of Kustom 12 inch monitor boxes this next month. On trapezoids I just measure the box and ignore the pointy end and everything works fine. Speakers are way more forgiving than people realize.
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Old 15th January 2018, 07:15 PM   #5
globalplayer is offline globalplayer  Germany
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Quote:
Originally Posted by Jsixis View Post
Speakers are way more forgiving than people realize.
Depends on the enclosure type.
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Old 16th January 2018, 04:23 AM   #6
Supertzar is offline Supertzar  Canada
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Quote:
That has been my experience and I have built at least 2 dozen boxes varying in speaker sizes 4" full range to 15" with winISD, <snip>
After building my guitar cab I feel confident that WinISD can be used to design any simple sealed, ported, or passive radiator enclosure. Those are the kinds of forgiving enclosures where you can fudge the volume a bit, or alter the tuning slightly. Something like a back loaded horn or transmission line must be constructed and tuned more precisely.

The Alpha 15A is an interesting speaker, its very high Qts makes a favourite among the open baffle types. I've found it hard to get a flat response out of it in WiniSD though, putting it in even a large sealed enclosure gives a large peak in the bass response before it rolls off.
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