JBL CSMA1120 4 input - 1 x 120W DriveCore Mixer-Amp, Fanless, 4ohm/8ohm/70V/100V

Vendor: JBL
JBL CSMA1120 4 input - 1 x 120W DriveCore Mixer-Amp, Fanless, 4ohm/ 8ohm/ 70V/ 100V The JBL CSMA 1120 Commercial Series Mixer/Amplifier is a mixer/amplifier with one output channel and four mixer-channel inputs...
$720.00 $1,128.00

JBL CSMA1120 4 input - 1 x 120W DriveCore Mixer-Amp, Fanless, 4ohm/ 8ohm/ 70V/ 100V

The JBL CSMA 1120 Commercial Series Mixer/Amplifier is a mixer/amplifier with one output channel and four mixer-channel inputs designed professionally for commercial and industrial use. JBL CSMA 1120 is capable of reaching 120W of peak power with 15W per channel. For each channel, the unit's front panel sports is the volume controls, as well as a master volume adjustment bass, treble controls and knob, and a power switch. The volume controls are illuminated making them to be easily recognized and operate in darkened environments.

The amplifier is capable of driving both four and eight Ohm loads, and can be also used with 70V and 100V distributed audio systems without the need for a separate transformer. On this JBL CSMA 1120's back panel you'll find the speaker connections, the mic/line inputs, unbalanced RCA inputs and phantom power switches, and more. The unit is also equipped with a RJ45 connector for use with JBL CSR-V in-wall volume controls (available separately).

This Commercial Series mixer/amplifier, JBL CSMA 1120, it widely known for such features priority muting for channel one's input, a sleep mode which automatically powers down the unit when no audible signal has been received for longer than 30 minutes and voice activating ducking (useful for paging over background music). Also, you may connect to an additional amplifier, with an auxiliary output, though the tone and master volume will have no bearing on the resulting signal.

Channel Modes

Four inputs into one output channel with 120W of power.


  • Independent Bass and Treble controls for each output channel.
  • Input level and output volume controls.

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 the phantom power switch.

VOX Function

Voice activated ducking is available on input channel one. 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

Input Channel one may be used as a priority channel, muting all other channels when pins four and five 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 Control

Remote 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.

Auxiliary 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.


  • Crown's DriveCore technology
  • HARMAN's GreenEdge environmental standards

Additional Features

  • Suitable for commercial and industrial use
  • Ideal for commercial and industrial
  • Euro-block type mic/line input connectors and output connectors
  • Configurable output routing

    JBL CSMA 1120

    Maximum Output Power 120 W per channel into 4 Ohms or 8 Ohms, 1 kHz, ≤ 0.5% THD
    Insertion Loss 1 dB maximum for 70 and 100 V outputs
    Continuous Power 15 W per channel
    Line Output Level 5.0 V RMS into 10 kOhms
    Input Sensitivity To obtain full rated power at 8 Ohms (or 5 VRMS to line output)
    Mic Input: 3 mV RMS
    Line Input: 775 mV RMS
    RCA Input: 300 mV RMS
    Number of Channels Input: 4
    Output: 1
    Frequency Response Measured at 2.83 V RMS into rated load impedance at any output
    4/8 Ohms Output: 20 Hz - 20 kHz, ±2 dB
    70 V/100 V Outputs: 80 Hz - 15 kHz ±2 dB
    Line Out: 20 Hz - 20 kHz, ±1 dB
    Total Harmonic Distortion (THD) Power Amplifier Output: <0.5%, 20 Hz to 20 kHz
    Line Output: 0.05% typical
    Signal to Noise Ratio > 90 dB
    Nominal Input Impedance Mic: 400 Ohms
    Line: 20 kOhms (balanced)
    RCA: 50 kOhms
    Minimum Load Impedance Low Impedance Output: 4 Ohms
    70 V Output: 40 Ohms
    100 V Output: 80 Ohms
    Crosstalk -70 dB @ 1 kHz
    Controls Front Panel:
    4 x Input level rotary knob
    1 x Output volume attenuator, rotary knob
    1 x Power switch
    1 x Bass potentiometer
    1 x Treble potentiometer


    Rear Panel:
    1 x Hi-Z switch
    1 x Phantom power switch
    4 x Mic/Line selector switches
    1 x VOX adjustment

    Indicators Front Panel:
    4 x Input signal presence ring, green
    1 x Output volume ring, green
    1 x Power switch ring, green/blue
    Connectors Rear Panel:
    1 x IEC power input
    1 x 5-pin amplifier output
    1 x 3-pin auxiliary line level output
    1 x RJ45, remote volume
    3 x 3-pin Euroblock Mic/Line input
    3 x Dual RCA stereo input
    1 x 5-pin Euroblock Priority input
    Operating Temperature / Humidity 32 to 95°F / 0 to 35°C, 95% RH (non-condensing)
    Storage Temperature -4 to 185°F / -20 to 85°C
    Phantom Power 27 VDC
    AC Input 100 to 240 VAC, 50/60 Hz
    Dimensions (W x D x H) 8.6 x 11.9 x 1.7" / 21.9 x 30.3 x 4.3 cm
    Weight Approximately 7.1 lb / 3.2 kg