I just inherited a Polk Audio Subwoofer. The model on the bottom say RM3000. It has 6 contacts; 2 (+/-) for a Left In and 2 (+/-) for a Right In and also a "blue" single contract. I've tried to find information on the PA site, but nothing. Can anybody help me with what I have and how to hook it up? I've got a Sony A/V Unit, a Carver, Technics, and Sansui amps, as well as some other equalizers, etc. Thanks.