30 PPI foam for HOM absorption in waveguides - Page 2

doug20 · 13th June 2010, 01:47 AM

Quote:

Originally Posted by Ed LaFontaine

Any of you gentlemen have leftovers?

My application is a pair of QSC 152 waveguides.

Do you have a build thread? I would love to follow since I have built a set of QSC 152 clones already but Im always looking to learn something.

I have used the 30 ppi foam from swisstropics.com (link just posted) but I can not seem to figure out what it really does to the sound or the measurements. I had limited luck with it.

I wonder what Geddes really uses??

Ed LaFontaine · 02:16 PM

Geddes is in the greater Detroit area. I would speculate he uses a local source.

He has graciously offered to sell some. However, my labor is cheaper than his.

I like the source JLH has posted. Thanks.

I'll look into making a plug from 2 pieces. One for the throat, beginning with a cube. The piece outside of that will be made from flat stock. I'll prepare templates for the x & y axis of the wg and remove material in "sections".
For retention of the pieces, I'll investigate copper wire inserted into the walls of the guide. I haven't determined the gauge or length yet (but my thoughts are ~24 gauge and 1/2" exposure). The wire will be bent over to serve as barbs, and be distributed around the guide.

For reference, here are other links.

Reticulated Foam - Stephenson & Lawyer - Foam Fabrication for Engineered Applications

RETICULATED FOAM SHEETS - H-O Products Corp.

Welcome to Foam Factory

Dryfast Foam, Outdoor Foams, Patio Furniture Custom Cushion Replacement, Hi-Flow Foam

Ed LaFontaine · 13th June 2010, 02:55 PM

Poret will NOT be shipping June 15-20. I need to get some in my hot little hands. I'll be ordering n.l.t. mid-day Monday.

doug20 · 14th June 2010, 04:59 PM

Cool, may I suggest buying a $10 electric knife to cut the foam. I posted in the other thread answering your question.

SimontY · 19th October 2010, 03:01 PM

Has anyone in the UK reading this tried to source suitable foam? I'm not sure where I can find it.

Thanks,
Simon

13th June 2010, 02:08 PM	#12
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	Geddes is in the greater Detroit area. I would speculate he uses a local source. He has graciously offered to sell some. However, my labor is cheaper than his. I like the source JLH has posted. Thanks. I'll look into making a plug from 2 pieces. One for the throat, beginning with a cube. The piece outside of that will be made from flat stock. I'll prepare templates for the x & y axis of the wg and remove material in "sections". For retention of the pieces, I'll investigate copper wire inserted into the walls of the guide. I haven't determined the gauge or length yet (but my thoughts are ~24 gauge and 1/2" exposure). The wire will be bent over to serve as barbs, and be distributed around the guide. For reference, here are other links. Reticulated Foam - Stephenson & Lawyer - Foam Fabrication for Engineered Applications RETICULATED FOAM SHEETS - H-O Products Corp. Welcome to Foam Factory Dryfast Foam, Outdoor Foams, Patio Furniture Custom Cushion Replacement, Hi-Flow Foam __________________ ...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 Last edited by Ed LaFontaine; 13th June 2010 at 02:16 PM.

13th June 2010, 02:55 PM	#13
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	Poret will NOT be shipping June 15-20. I need to get some in my hot little hands. I'll be ordering n.l.t. mid-day Monday. __________________ ...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

19th October 2010, 03:01 PM	#15
SimontY diyAudio Member Join Date: May 2003 Location: Sheffield, North England	Has anyone in the UK reading this tried to source suitable foam? I'm not sure where I can find it. Thanks, Simon __________________ Fave. threads: Marantz CD63 \| Philips CD650 \| my 3-way dipoles \| T-bass for dipoles \| EnABL treatment \| Arcam Alpha (CD)

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14th June 2010, 04:59 PM	#14
doug20 diyAudio Member Join Date: Mar 2009	Cool, may I suggest buying a $10 electric knife to cut the foam. I posted in the other thread answering your question.

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