I bit my tongue, but I couldn't help making you do some of the work - here's some links... :D
http://www.lansingheritage.org/html/jbl/specs/pro-speakers/1977-4343.htm
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I bit my tongue, but I couldn't help making you do some of the work - here's some links... :D
http://www.lansingheritage.org/html/jbl/specs/pro-speakers/1977-4343.htm
...