Sound Test JBL GTO 528 car speakers - Prueba parlantes JBL GTO 528 - YouTube
JBL GTO-528 5-1/4 2-Way 45W RMS Coaxial Speakers
Used JBL GTO 528 Loudspeakers for Sale | HifiShark.com
JBL GTO628 360W Max 6-1/2" / 6-3/4" 2-Way Grand Touring (GTO) Series Coaxial Speakers with 1" Mylar-Titanium Tweeters, Patented Plus One Woofer Cone and 2 ohms Impedance