S7horton,
The shelf life of butyl rubber is 10 years as per MIL-HDBK-76? (Age Control Of Elastomers). Sure enough after 11-12 years of purchasing my AR-11's back in 1975 the woofers had to be replaced.
The shelf life of butyl rubber is 10 years as per MIL-HDBK-76? (Age Control Of Elastomers). Sure enough after 11-12 years of purchasing my AR-11's back in 1975 the woofers had to be replaced.