My active subwoofer does not work or goes all out. When adjusting from the JVC receiver, it booms(excessively) then dies after I turn it down. I've tried adjusting the output on the subwoofer, but no help. It sat inactive for about three years. I tried it at my old house and new house. It did work when I bought it. I bought it as a packaged 5.1 system from JVC. Any help??