Hi, I bought a Gale Sub 6 from Richer Sounds. I have a Technics SA-AX710 AV receiver. I currently have my DVD player hooked up with 5 speakers for surround sound. On the back of the amp is one output for a subwoofer. On the instructions with the subwoofer it said that if you have only out output from the your amp then connect up the left (mono) cable only to the subwoofer. I tried this but the subwoofer only appears to be making a very very quite rumble when I run the 5.1 surround sound test and when playing a movie I can't really hear it at all. I have to put my ear right up to the subwoofer to hear this slight rumble. Does anyone know why my subwoofer is behaving so quietly? Thanks. Sorry.....this should be in the Subwoofer forum!!!!!!