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Old 24th August 2003, 11:19 PM   #1
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Default Manifold Enclosure for bass

I have a question. A local church has four Peavey 15" woofers which need bass enclosures so they can go with their PA system as subs. I have seen Electro-Voice PA subwoofers that use a loading technique called a Manifold. Are there any special considerations that need to be made for designing such an enclosure?
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Old 25th August 2003, 01:50 AM   #2
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I'm sure there is. Got any pics or details? I know what I consider a manifold, a bunch of drivers firing into a common pipe, but it may not be EV's.

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Old 25th August 2003, 02:19 AM   #3
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No special considerations - it is just a vented box. Calculate the volume and port pretty much as usual.

The close proximity of all the drivers may add a bit of loading, so tuning a bit lower to start out could be a good idea, but it depends on what electronics and crossover frequencies you are using and how the response turns out.
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Old 25th August 2003, 04:06 AM   #4
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OK, I remember these. They're BPs, and for max performance need to be modeled as such since the central cavity dims sets the HF BW/gain/cutoff.

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Old 25th August 2003, 07:39 PM   #5
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Is that a sealed center chamber?
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Old 25th August 2003, 08:59 PM   #6
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No, per the shading on the drawing it shows a solid back and open front, creating a 1/4WL vent pipe, and why its depth/area is key to its HF response, etc.. It's a design I've 'cloned' and it works quite well, just didn't know EV called it a manifold. It would be interesting to tweak the design to incorporate a Karlson coupler to increase its HF response high enough to XO to a mid horn.

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Old 26th August 2003, 09:53 PM   #7
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I don't see anything like a quarter-wave pipe. All I see is a vented box. Please explain how I am to determine the dimensions of the manifold, if you would.
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