GTO529 | Regulate the high tones +3 or -3 dB individually with the special switch on the tweeter
GTO528 | Concert-quality 5 1/4 inch 2-way Coaxial Car Speakers
Amazon.com: JBL GTO Series Premium 6 x 8 Inches Co-Axial Speakers Pair with Patented Plus One Woofer Cone, Silk Dome Tweeters - Set of 2 Bundled with Earbuds : Electronics
Amazon.com: JBL GTO629 Premium 6.5-Inch Co-Axial Speaker - Set of 2 : Electronics