6-1/2" Two-Way loudspeaker with Plus One® woofer cone and 1" edge-driven My-Ti™ tweeter and 1/2" My-Ti.™ super tweeter. The GTO638 also feature JBL’s Intermount III mounting system, allow it to be installed in all 6" hole size standards. Plus One® (patent pending) woofer cones – The GTO638 has a cone with more surface area than that found on competing models of the same size. The benefits of Plus One cones are greater efficiency and bass output. True Four Ohm – GTO Se…