GT-BASSPRO12 | Subwoofer speaker with built-in 150W RMS amplifier with bass port for a surprising bass experience
JBL GT Series Subwoofer and Clarion Speakers - Roller Auctions
Old School 90's JBL GT Series GT122 140W-280W Single Voice Coil 12" Subwoofer | eBay
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
JBL GTO Series GT120 12" 4-ohm Subwoofer at Crutchfield