RAA RAA like a dungeon dragon!
You have to add a relay in the speaker wire loop. one side of the wires will come from your amp together with the speaker out from the carkit To the relay and from the relay to the speaker that you want the call to come through. (I think I've explained it right) you will lose a little signal cause the wires from the relay will be a normal thin guage and you have to join them to the thicker guage speaker wire but it still sounds pucker. I just installed mine and it's a lot better lot louder and clearer and i put it through one of my rears which are set lower than my fronts but still loud when a call comes through. I may swap over to my front at some point but I was thinking of keeping my good connections up front. I have a mate that works audio installing and he made the relay wiring up for me so I just had to join it and voila! done