Hi, I have a set of EV-Six speakers and am trying to find info on them Year built,Where manufactured

I am trying to find a manual ,and what they are worth. These sound GREAT!!,Almost as good as my L300 JBLs. I have been using a Proton 940 reciever to test them. I have had these in my garage for the last 30 years. Any info would be appreciated. Randy

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