I think you are referring to the move from clear plastic with a little ring showing the red and black to full out red and black plastic. We did this to make the positive and negative much easier to see as a lot of times this connection is getting made while hanging over the top or side of the speaker and with poor lighting back there. Having one speaker out of phase makes things sound ugly so anything to avoid that happening is a good thing.

Ian Colquhoun
President & Chief Engineer