PRODUCT OVERVIEW
Designed for commercial and industrial use, the CSMA 280 Commercial Series Mixer/Amplifier from JBL is a mixer/amplifier with eight mixer-channel inputs and two output channels. It’s capable of reaching 80W of peak power with 10W per channel. The unit’s front panel sports volume controls for each channel, as well as two master volume adjustment knobs, two sets of bass and treble controls, and a power switch. The volume controls are illuminated so they can be seen and operated in darkened environments.
Channel Modes 8 inputs with 2 outputs of 120W of power. Controls ndependent Bass and Treble control for each output channel. Input level and output volume control. Hi-Z Switch The Hi-Z switch will switch in the built-in output transformer allowing the unit to drive 70V or 100V speaker systems directly when connected to the appropriate output terminals. Phantom Power Phantom power (27 V) can be applied to all mic inputs by turning on Phantom Power within the dip switches. VOX Function Voice-activated ducking is available on input channel 1 and channel 5.

The audio input level required to activate ducking is set using the trim pot on the rear panel. Adjusting in the counter-clockwise direction will reduce that level, while the full clockwise setting will disable the VOX function. Priority Muting Channels one and five may be used as priority channels, muting all other channels when pins 4 and 5 are shorted using a switch closure.
If the amplifier has entered sleep mode due to inactivity, invoking priority will also bring the unit out of sleep and ready for transmitting an announcement. Remote Volume ControlRemote volume control can be implemented using a CSR-V controller connected via an Ethernet cable to the RJ45 connector on the back panel.

Sleep Mode This unit is designed to go into sleep mode after approximately 30 minutes operating with no signal at any of the inputs. Return of signal (-40 dBu or 7.75mVRMS) to any input will wake the unit. Also, a switch closure across the priority input pins will return the unit to normal operating mode. AUX output An auxiliary output that you may connect to additional amplifiers is available. The audio signal is the mix of the input channels.
Note that the master volume control and tone controls will have no effect on the aux output signal. Manufacturing Crown’s DriveCore technology HARMAN’s GreenEdge environmental standards Certifications and Approvals Lead-free RoHS standards, utilizing recycled metals and using an energy-saving powder coat process