CSMA180

The CSMA180 is a single-channel, 80W commercial mixer amplifier built for background music and paging in restaurants, cafes, retail stores, offices, and other small to mid-size commercial spaces. It combines four inputs and an amplifier in a fanless chassis just 1U high, so it takes a single rack space and runs without fan noise in a back office, closet, or under-counter cabinet. Balanced mic/line inputs on Euro-block connectors and unbalanced RCA inputs accept paging mics, music players, and streamers, and priority muting drops the music automatically when someone makes an announcement.

The amplifier powers 4 or 8-ohm speakers directly and connects to 70V and 100V distributed audio systems without a separate transformer, so the same unit can run a few wall speakers in a small shop or a long line of ceiling speakers across a larger floor plan. Configurable output routing lets you decide which sources reach the output, and independent bass and treble controls let you tune the sound to the room.

The front panel keeps things simple for staff: a volume control for each input, an overall volume control, tone controls, and a power switch. Each volume knob sits inside an illuminated ring that stays easy to read in a dim dining room or bar. RJ45 connectors accept JBL CSR-V in-wall volume controls over standard Ethernet cable, so volume can be adjusted from the floor instead of the rack. A universal 100-240 VAC power supply, Energy Star certification, and an included rack mounting kit round out a compact amplifier that's ready for permanent installation.