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JBL Incorporated, Balboa Boulevard, P.O. Box , Northridge, California U.S.A. JBL REV A. PACKAGE. WIRING DIAGRAM. Buy the JBL In-Ceiling Speaker with 8 Driver at Full Compass. The JBL is a 8-inch, full-range, cost-effective loudspeaker for commercial applications. The JBL ceiling loudspeaker is a 8 inch, full-range, cost-effective loudspeaker for commercial applications and features high-fidelity performance in an.