Designed for commercial and industrial use, the CSMA 1120 Commercial Series Mixer/Amplifier from JBL is a mixer/amplifier with four mixer-channel inputs and one output channel. It's capable of reaching 120W of peak power with 15W per channel. The unit's front panel sports volume controls for each channel as well as a master volume adjustment knob, bass and treble controls, and a power switch. The volume controls are illuminated, so they can be seen and operated in darkened environments.
This Commercial Series mixer/amplifier boasts such features as voice-activating ducking (useful for paging over background music), priority muting for channel one's input, and a sleep mode, which automatically powers down the unit when no audible signal has been received for longer than 30 minutes. Also, with an auxiliary output, you may connect to an additional amplifier, though the master volume and tone controls will have no bearing on the resulting signal.
JBL CSMA 1120
Key Specifications
Amplifier
Form Factor/Type: Rackmount
Number of Channels: 4 Input / 1 Output
Amplifier Power Rating: 4 Ohms / 8 Ohms: 120 W per Channel (1 kHz, 0.5% THD), 15 W per Channel
Load Impedance / Voltage: 4 Ohms (Minimum), 70 V (40 Ohms Minimum), 100 V (80 Ohms Minimum)
Performance
Frequency Response: Amplifier: 20 Hz to 20 kHz ±2 dB (Low-Z), 80 Hz to 15 kHz ±2 dB (70/100 V); Line Output: 20 Hz to 20 kHz ±1 dB