yoram611 Posted February 20, 2020 Report Share Posted February 20, 2020 Hi, does anybody know what is the material used to cover the fiberglass wool to protect the woofer ? is it some kind of paper or cloth ? mine is torn and I like to replace it. Thank you in advance Yoram Quote Link to comment Share on other sites More sharing options...
JKent Posted February 20, 2020 Report Share Posted February 20, 2020 Hi Yoram Yes, it is paper, called Kimpak but there are better alternatives IMHO. Allison speakers used fiberglass window screening which may be too porous. KLH used 28-count crinoline, which can be found in any fabric store. The best alternative comes from CST Jedi Master RoyC: Poly-fil low-loft blanket batting: https://www.walmart.com/ip/Poly-Fil-Crib-Size-45-x-60-Low-Loft-Batting-1-Each/26003469 Just use a thin layer over the fiberglass instead of the old Kimpak. And be sure to download the AR-3a restoration guide from the Library: http://www.classicspeakerpages.net/library/acoustic_research/original_models_1954-1974/original_models_schematicss/restoring_the_ar-3a/ Kent Quote Link to comment Share on other sites More sharing options...
yoram611 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Hi kent, Thank you so much for the detailed reply, I live in Israel and I am not sure I can get the materials you recommanded here , What actually is the main thing I should look for in a material ? can I use a special cloth they sell here to wipe floors but its a little thicker then the original Kimpak ? does it have to be thin ? if its cloth does it have to be synthetic like polyester or can it be cotton ? Thanks again Yoram Quote Link to comment Share on other sites More sharing options...
JKent Posted February 20, 2020 Report Share Posted February 20, 2020 Yoram, You want a thin, somewhat open weave fabric to keep the fiberglass dust away from the woofer. Something like gauze may work but something a little stiffer may be better. Crinoline has been around a long time and may be available. Yes, it should be thin. The actual fiber doesn't matter. Kent Quote Link to comment Share on other sites More sharing options...
yoram611 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Thanks again Kent, I'll be looking for something suitable tomorrow . All the best. Quote Link to comment Share on other sites More sharing options...
lARrybody Posted February 21, 2020 Report Share Posted February 21, 2020 If you can't find Crinoline fabric i have used plane old kitchen cheesecloth. Quote Link to comment Share on other sites More sharing options...
BAWSME Posted February 22, 2020 Report Share Posted February 22, 2020 I have some surplus garden weed fabric. I was thinking to use this since I have some on hand. It’s porous enough for water and my breath when I blow threw it. It’s a little stiff. Any thoughts or concerns about this idea? Quote Link to comment Share on other sites More sharing options...
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