4X JBL GTO939 180 Watts GTO Series 6.9" 2-Way Coaxial Car Audio Speakers 6x9” | eBay
JBL Grand Touring Series GTO927 6"x9" 2-way car speakers at Crutchfield
Amazon.com: JBL GTO Series Premium 4 x 6 Inches Co-Axial Speakers Pair with Patented Plus One Woofer Cone, Silk Dome Tweeters - Set of 2 Bundled with Earbuds : Electronics
JBL Grand Touring Series GTO8627 2-way car speakers For 5"x7" and 6"x8" openings at Crutchfield
JBL STADIUM862F 6" x 8" Stadium Series Step-up Custom-Fit Car Audio Speaker System - Creative Audio
GTO629 | This JBL series incorporates many patents that are also found in JBL's pro speakers