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Old 8th May 2010, 08:31 PM   #1
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Default experiment with port diameter

Has anybody experimented with port diameter? I mean, trying to maintain same resonance of port and Vb of enclosure but changing port diameter. what is the audioable difference?
I tried doing kind of experiment. when the port diameter is smaller it gives a feeling that apparently the speaker size is small. but when port diameter was increased bass was much cleaner, smoother and gave feeling of a larger speakers. Don't know what I experienced is true or just my kind of illusion. guys please share your experience or If you have any knowledge on this.
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Old 9th May 2010, 02:00 AM   #2
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I don't "experiment " with size anymore, I usually just use the largest diameter port that's feasible to avoid port compression and the associated turbulance that introduces unwanted noise. It just makes sense to let out as much of the rear radiated sound from a woofer anyways(and helps with V.C. cooling!).I usually use port areas that are 25-35% of cone area. Did you try two different boxes with the same cubic footage and woofer, just different port diameters?, behind a curtain?
Sorry to not really answer your question, but yes I do find a larger port gives a more "robust" bass

Last edited by Top Shelf; 9th May 2010 at 02:02 AM. Reason: incomplete
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Old 9th May 2010, 11:09 AM   #3
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actually I was about to ask about different shape of boxes while keeping same cubic footage. Not only that but also different enclosure material. and variations in its wall thickness.
I wonder if there is any tool to simulate fq response based on box dimensions.
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Old 9th May 2010, 12:03 PM   #4
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quarter wave.com

MLQW

It includes consideration of all the internal dimensions of the enclosure

Consideration of material type & thickness remains to be developed
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Old 9th May 2010, 12:32 PM   #5
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Have you seen this?
Porting at Subwoofer-Builder.com
Collo did some great work on ports.....


My blog:
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Old 10th May 2010, 09:37 AM   #6
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Guys thanks for your reply... sure the links provide would be of great help to me.

I am facing a problem more. which I cant discuss under this subject. please have a look and be kind enough to help me.
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Old 10th May 2010, 12:54 PM   #7
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You can PM me at cred@rediffmail.com for any help that I may be able to render.
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