JBL GTO427

Plus One (patent pending) woofer cones - The GTO427 has a cone with more surface area than competing models of the same size. The benefits of Plus One are greater efficiency and bass output.True Four Ohm - GTO Series speakers can be safely driven by any head unit.My-Ti (Mylar/titanium composite) tweeters. Stiff and light, extremely efficient, JBL’s new My-Ti tweeters deliver the high-frequency extension of titanium domes with the damping of composite diaphragms.