JBL CSMA2120 8 Channels 120W Commercial Mixer Amplifier


The JBL CSMA 2120 is an 8 channel, 120 Watt powered mixer-amplifier. This mixer amp offers ease of use, with a clean, front panel featuring volume controls and master volume adjustment, adjustable bass and a power switch.


The CSMA 2120 Commercial Series Mixer/Amplifier from JBL is a two channel mixer/amplifier with 8 mixer channels. The CSMA 2120's front panel features volume controls for each channel, master volume adjustment, adjustable bass and treble rotary controls, and a power switch. The Volume controls are surrounded by an illuminated ring so they can easily be seen and operated in darkened environments. The amplifier can drive 8Ω and 4Ω loads, and can be used with 70V and 100V distributed audio systems without the need for a separate transformer. This unit features mic/line inputs, unbalanced RCA inputs, and speaker connections. It is equipped with a RJ45 connector for use with JBL CSR-V in-wall volume controls (sold separately). The CSMA 2120 mixer/amplifier's built-in universal power supply is designed to accept AC voltages from 100 to 240 VAC, 50/60Hz.

This Commercial Series mixer/amplifier is manufactured under HARMAN's GreenEdge environmental initiative, conforming to lead-free RoHS standards and utilizing recycled copper, aluminum, steel, an energy-saving powder coat finishing process, and other environmentally-conscious manufacturing processes. Its DriveCore design is meant to reduce power consumption.

Channel Modes
8 inputs with 2 output of 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 1. 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 1 may be used as a priority channel, 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 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 (-40dBu 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.
Crown's DriveCoreTM technology
HARMAN's GreenEdge environmental standards
Fanless, 1/2 RU design with illuminated rings designed for easy operation in darkened environments
Certifications and Approvals
Lead-free RoHS standards, utilizing recycled metals, and using an energy-saving powder coat process
Energy Star certified

Maximum Output Power120 W per channel into 4 Ω or 8 Ω, 1 kHz, ≤ 0.5% THD
Insertion Loss1 dB maximum
Continuous Power15 W per channel
Number of ChannelsInput: 8
Output: 2
Line Output Level5.0 V RMS into 10 kΩ
Input SensitivityMic Input: 3 mV RMS
Line Input: 775 mV RMS
RCA Input: 300 mV RMS 1

Please Note:

To obtain full rated power at 8 Ω (or 5 VRMS to line output)

Frequency Response4/8 Ω Output: 20 Hz – 20 kHz, ±2 dB
70 V/100 V Outputs: 80 Hz – 15 kHz ±2 dB
Line Output: 20 Hz – 20 kHz, ±1 dB 2

Please Note:

Measured at 2.83 V RMS into rated load impedance at any output

Total Harmonic Distortion (THD)Power Amplifier Output: <0.5%, 20 Hz – 20 kHz
Line Output: 0.05% typical 3

Please Note:

Measured at 2.83 V RMS into rated load impedance at any output

Signal to Noise Ratio> 90 dB
Nominal Input ImpedanceMic: 400 Ω
Line: 20 kΩ (balanced)
RCA: 50 kΩ
Minimum Load ImpedanceLow Impedance Output: 4 Ω
70 V Output: 40 Ω
100 V Output: 80 Ω
Crosstalk-70 dB @ 1 kHz
Operating Temperature / Humidity32 to 95°F (0 to 35°C), 95% RH (non-condensing)
Storage Temperature-4 to 185°F (-20 to 85°C)
Phantom Power27 VDC
AC Input100-240 VAC, 50/60 Hz
Dimensions (W x D x H)17.2 x 11.9 x 1.7″ (43.7 x 30.3 x 4.3 cm)
WeightApproximately 12.1 lb (5.5 kg)

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See Also : PA Mixing Amplifier, JBL