My dad recently gave me a pair of these old JBL speakers as him and my mom are moving to México for retirement. I don't know much about them other than they
ProX XZF-AH-S5000 D 2U For Allen and Heath DLive S5000 Flip-Ready Hydraulic Console Easy Retracting Lifting 2U Rack Space Detachable Case by ZCASE | ProX Live Performance Gear
Vintage JBL POWER50 100-Watt Stereo Power Amplifier | eBay