JBL 8124 Ceiling Mount Speaker with TransformerPriced individually, but sold in packs of 4. The 8124 is a 4 inch, full range, cost effective loudspeaker for commercial applications. The 8124 features high fidelity performance in an easy to install package. The system's high sensitivity drivers deliver maximum sound levels using minimal amplifier power. With its contemporary grill design, 70V 100V taps and an open back design, the 8100 series brings elegance and performance to basic commercial