Hi Roy, There is a bit more about them here: http://www.meyersound.com/products/technology/chamber.htm Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. mailto:drose@dlcwest.com after Oct. 30 mailto:drpt@sk.sympatico.ca http://donrose.xoasis.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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