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Not sure of the age but the logo used was for 75-83. The speakers inside have CTS codes but are round magnets and 12 ohms with aluminum dust caps. Apparently a speaker engineer from CTS went on to form Eminence around the time this was made, but since CTS speakers are usually square and these are round... maybe these were some of the first Eminence speakers ever made?
Either way it sounds crazy full, very thick and thumpy in a good way.