@johnto Wrote:
Cloth vs paper surround
See article below: Page #6 figure 3.
Mike
https://www.lansingheritage.org/html/jbl/reference/notes/tech1-3a.htm
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+1 @dekay I had a pair of old Radio Shack Optimus 1s with cloth surrounds. They dried up and became stiff so I think that would be the main issue with them |
ALWAYS go with the original material, the surround can be considered like the suspension of a cartridge's cantilever, CONTROLLING Movement. My vintage electrovoice 15" woofers from 1958 MUST be cloth. Last much longer: To alter the response, more than likely detrimentally for every day of their longer life is a 'wrong' decision. Paper lasts a long time, the original surround for that size cone is likely to be around for generations! Avoid any hvac heat discharge nearby, shut that vent to prevent premature aging/drying of the paper. Very dry house, get a whole house humidifier or if radiators nearby, add water gizmos,
https://www.amazon.com/air-vent-blocker/s?k=air+vent+blocker
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avsjerry: I tried something a local phile gave me that (to me) smelled like brake fluid and then I tried a skin lotion my wife used (think it was lanolin based). Also tried re-doping a pair of US made drivers (forget who originally made them as they were marketed under various brands - including Lafayette - maybe Jensen). In all cases they stiffened back up within 2-3 months, or so, and I gave up. I still have 2 pairs of Japanese made 4.5" drivers with porous (screen like) cloth surrounds that I have not messed with (the surrounds). They mated OK with a Gallo TR2 sub set @ the speaker level default of 100Hz and I assume that they fall like a rock @ around 90Hz. I own/owned "vintage" Stephens Trusonic, Coral, Elac, R&A, RCA, Foster (predecessor of Fostex), Altec and Jensen(?). Maybe a few others I've forgot.
DeKay |
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