There were the Celestions with their Aerolam cabinets. The Green Mountain Audio speakers that had a sort of cast marble cabinet. Were/are there other speaker manufacturers that used some kind of odd or exotic materials for the cabinets? Are there speakers with real wood cabinets (rather than veneer?)
Some Thiel CS-6s had concrete front baffles. Magico uses 6061 aluminum in their speakers. I have a pair of Green Mountain Audio Europas in my room right now and they seem extremely heavy, dense, and inert.
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