PARADIGM PDR-10 V.3 POWERED SUBWOOFER AMPLIFIER MODULE (AMPLIFIER ONLY) - FULLY TESTED. THIS AMP WORKS GREAT AND IS VERY GOOD CONDITION. (WE HAVE BEEN IN BUSINESS FOR OVER 60 YEARS REPAIRING VINTAGE AUDIO EQUIPMENT.) IF YOU HAVE ANY CONCERNS, PLEASE CONTACT US PRIOR TO YOUR PURCHASE.