Signal Converter? from circuit city? hmmmm i went to circuit city and the guys didn't say anything about that....do u have a more specific name that you can provide me so that i can go ask...and also , where is the Bose's sub signal? is it under my seat, or is it in front of the car around the brake and gas pedal area? From what you say, i assume you are disabling the Sub under the seat and converting that signal from the BOSE system (in which i think its already EQ'ed to be Bass sound) to the RCA, than to the the AMP, than to the SUB.