JBL 8124 - Full-Range In-Ceiling Loudspeaker with 70 Volt/100 Volt Taps (4 Pack) Pack includes: (4) elegantly designed 8124's that offer a contemporary look and feel that fits perfectly with any basic commercial audio system Features a 4-inch full-range driver that produces clear, high-fidelity performance audio - great for foreground/background music High Sensitivity 93 dB 1W 1m for maximum sound levels using minimum amplifier power Equipped with a built in 6 watt transformer for use on 70V/100V distributed speaker lines Installs within a variety of ceiling types without the need for backcans (Dog-ears for easy Blind Mount Installations)