John Warren Posted March 14, 2015 Share Posted March 14, 2015 (edited) Humidity is the culprit. The water gets to the molecules and breaks them down. The reaction is called Hydrolysis and happens to polyester-based foams of which speaker surrounds are made from. Today's foam (polyether-based) surrounds are better than the vintage stuff but they too will eventually need replacement. Rubber surrounds aren't problem free either, they crack and stiffen with time. As far as cloth surrounds go, they're infiltrated with polymeric sealants and can deteriorate too resulting in leakages at the surround. So nowhere is there a Utopia. Edited March 14, 2015 by John Warren Quote Link to comment Share on other sites More sharing options...
djk Posted March 15, 2015 Share Posted March 15, 2015 " The water gets to the molecules and breaks them down" A thinned-out layed of Weldbond (about 5:1) will seal it and extend the life quite a bit. Quote Link to comment Share on other sites More sharing options...
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