GTO629 | This JBL series incorporates many patents that are also found in JBL's pro speakers
JBL GTO508C 2-Way 5.25in. Car Speaker for sale online | eBay
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 6" x 9" 2-Way Car Speakers with Polypropylene Cones (Pair) Black GX9628 - Best Buy