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Paradox Mammouth Speakers

Hello, Looking for any information on a pair Of Paradox Mammouth Speakers. Built in the mid 70s by Sonic Energy Systems from Houston Texas. They are 51 h 22 w 22 d with four 10.5 speakers and nine 5 inch speakers. Some one I know is selling them in a package , but know nothing about them. Any info , value would be helpful.