experiment with port diameter

Aucosticraft · 8th May 2010, 08:31 PM

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.

Top Shelf · 02:02 AM

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

Aucosticraft · 9th May 2010, 11:09 AM

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.

Ed LaFontaine · 9th May 2010, 12:03 PM

Search

quarter wave.com

MLQW

It includes consideration of all the internal dimensions of the enclosure

Consideration of material type & thickness remains to be developed

consort_ee_um · 9th May 2010, 12:32 PM

Have you seen this?
Porting at Subwoofer-Builder.com
Collo did some great work on ports.....

My blog:
Consort3′s Blog

Aucosticraft · 10th May 2010, 09:37 AM

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.

Samuel Jayaraj · 10th May 2010, 12:54 PM

You can PM me at cred@rediffmail.com for any help that I may be able to render.

8th May 2010, 08:31 PM	#1
Aucosticraft diyAudio Member Join Date: Nov 2009 Location: Pune	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. __________________ There is always a first time....

9th May 2010, 02:00 AM	#2
Top Shelf diyAudio Member Join Date: Apr 2010 Location: Midland, Ontario	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

9th May 2010, 11:09 AM	#3
Aucosticraft diyAudio Member Join Date: Nov 2009 Location: Pune	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. __________________ There is always a first time....

9th May 2010, 12:03 PM	#4
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	Search quarter wave.com MLQW It includes consideration of all the internal dimensions of the enclosure Consideration of material type & thickness remains to be developed __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

10th May 2010, 09:37 AM	#6
Aucosticraft diyAudio Member Join Date: Nov 2009 Location: Pune	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. __________________ There is always a first time....


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9th May 2010, 12:32 PM	#5
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	Have you seen this? Porting at Subwoofer-Builder.com Collo did some great work on ports..... My blog: Consort3′s Blog

10th May 2010, 12:54 PM	#7
Samuel Jayaraj diyAudio Member Join Date: May 2001 Location: Bangalore, India	You can PM me at cred@rediffmail.com for any help that I may be able to render. __________________ Sam

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