It's subs and port firing back at the hatch. Roughly 6-7 inches for the hatch.Is the sub and port on the same plane of box?.........Can it be either sub up/ port back or sub/port back ?............How close will port be to rear hatch in Jimmy?......If the port is NOT right on top of the rear hatch I don't see why you still can't get some decent tunes.......GIVE IT A WHIRL.....