So which are the Left (-) &(+)
If you are wanting bass like would be able to get with rca outputs on the head unit to an amp, you need to bypass the Bose amp completely and use the vampire wire connectors before the Bose amp. This is because with the Bose, after half volume, your bass level will begin to decrease (automatically) to preserve the Bose speakers (OEM). So the way the Bose amp works is it processes the increased volume does not increase the level of bass to match.*that little Bose wheel well sub just doesn't do it for me.