I know it is annoying to have a massive picture but I didn't know how else to slap er in here. My boss just acquired these speakers from his parents and he said there is a bridge on both connections like in the picture. He said that one set of connections is labeled as bass and the other treble. There was only one wire hooked up to the bass and that is it. Because of the bridge, does that mean he would only need one positive and one negative attached to the speakers?