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.