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JBL CSMA 1120 Commercial Series Mixer/Amplifier

BH #JBCSMA1120 • MFR #CSMA1120
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JBL CSMA 1120 Commercial Series Mixer/Amplifier
Key Features
  • For Commercial and Industrial Use
  • 120W into 8- or 4-Ohm Loads
  • 15W per Channel
  • 4 Input Channels, 1 Output Channel
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.
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JBL CSMA 1120 Overview

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.

The amplifier, capable of driving both 8- and 4-ohm loads, can be used with 70V and 100V distributed audio systems without the need for a separate transformer. On its back panel you'll find the mic/line inputs, unbalanced RCA inputs, speaker connections, Hi-Z and phantom power switches, and more. The unit is also equipped with an RJ45 connector for use with JBL CSR-V in-wall volume controls (available separately). 

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.

Channel Modes
Four inputs into one output channel with 120W of power.
Controls
  • 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 (27V) 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 counterclockwise 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.
Manufacturing
  • Crown's DriveCore technology
  • HARMAN's GreenEdge environmental standards
Additional Features
  • Suitable for commercial and industrial use
  • Ideal for commercial and industrial
  • Euroblock-type mic/line input connectors and output connectors
  • Configurable output routing
UPC: 871015007359

JBL CSMA 1120 Specs

Form Factor/Type
Rackmount
Number of Mixer Inputs
4
Number of Amplifier Channels
1
Load Impedance/Voltage Support
4 / 8 Ohms
70 V (40 Ohms Minimum)
100 V (80 Ohms Minimum)
Power Rating per Channel
1x 120 W at 4/8 Ohms
Performance
Frequency Response
20 Hz to 20 kHz ±2 dB (Low-Z)
80 Hz to 15 kHz ±2 dB (70/100 V)
20 Hz to 20 kHz ±1 dB (Line Output)
SNR/Noise
> 90 dB SNR
THD/Distortion
≤ 0.5% THD (20 Hz to 20 kHz, Main Output)
≤ 0.05% THD (Line Output)
Crosstalk
-70 dB (1 kHz)
Signal Processing
DSP
Yes
Audio Delay
No
EQ & Filters
2-Band EQ
Dynamics
Compressor, Limiter
Connectivity
Analog Audio I/O
1x Block 3-Pin Aux/Line Output
3x Block 3-Pin Line/Mic Input
3x Stereo 2RCA Unbalanced Input
1x Block 5-Pin Priority Input
1x Block 5-Pin Speaker Output
Digital Audio I/O
No
Network I/O
No
Other I/O
1x RJ45 Remote/Volume
USB I/O
No
Phantom Power
+27 V
Wireless
No
Power
Input Power
100 to 240 VAC, 50 / 60 Hz
AC Power Connector
1x IEC
Physical
Display
Single-LED Indicators Only
Operating Conditions
32 to 95°F / 0 to 35°C up to 95% Humidity
Dimensions
11.9 x 8.6 x 1.7" / 30.3 x 21.9 x 4.3 cm
Weight
7.1 lb / 3.2 kg
Packaging Info
Package Weight
10.4 lb
Box Dimensions (LxWxH)
16 x 12 x 5"

JBL CSMA 1120 Reviews

Great sound output, mic issues

By Rany
Rated 3 out of 5
Date: 2023-07-15

I really struggled with this mixer amp. I wanted to love it being a long time JBL fan, but I went through multiple mics including two Tonor TW-820s (thinking maybe the first one was a lemon) and the Phenyx Pro PTU-71-2H (both Ultra High Frequency wireless mics) but only was able to get the VocoPro UHF-18-9 wireless mic to work without buzzing. I tried using both TRS quarter inch and balanced XLR cables and neither worked well for me. I got massive buzzing before I even hit quarter volume, which wasn't enough to hear the voice on the mic. I looked up the impedance on the mic input and saw it was only 400 ohms, which seemed low, but was also told by a B&H rep that it couldn't have been that. So I'm honestly at a loss and had to finish the job I was doing so just used the VocoPro mic. Very frustrating experience for me. I'd still love to know why this mixer/amp gave me such struggles with the other mics. If a B&H rep would be willing to help me understand what went wrong here, I'd really appreciate it.

See any errors on this page?

question

Does this include the rack brackets with purchase?
Asked by: Clayton W.
Yes. The rack mounting kit is included.
Answered by: Andrea O.
Date published: 2018-08-25
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