Overview
100 mm (4 in) Commercial Series Ceiling Speakers
JBL’s Commercial Series Ceiling Speakers provide excellent performance for paging and background music applications. High sensitivity across the product line provides maximum sound level, even at low tap settings.   
Features
High 90 dB sensitivity
5 Watt multi-tap transformer for 100V, 70V and 25V distributed lines
Very wide 175° coverage
Fits CSS-BB4 backcan