JBL CSM -21 2 x 1 Stereo Public Address Mixer

JBL CSM -21 2 x 1 Stereo Public Address Mixer

JBL CSM -21 2 x 1 Stereo Public Address Mixer

B&H # JBCSM21 MFR # CSM-21
JBL CSM -21 2 x 1 Stereo Public Address Mixer


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Important Notice: This item is non-cancelable and non-returnable
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Expected availability: 3-7 business days 
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Product Highlights

  • 2 Stereo Inputs and 1 Stereo Output
  • Separate Subwoofer Output on Euroblock
  • Standalone Operation Without a Computer
  • Ducks Music for Microphone Announcements
  • LevelGaurd Compression Optimizes Levels
  • AutoWarmth Optimizes Tonal Balance
  • Built-In Limiter to Prevent Clipping
  • Lock Front Panel to Prevent Changes
  • Link to other CSM Mixers via Cat5 Cable
  • Works with CSR Zone Remote Controllers
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  • 1Description

The JBL CSM-21 2 x 1 Stereo Public Address Mixer is a digital commercial mixer for conferencing, retail, and hospitality applications. The mixer features two stereo music inputs with bass and treble equalizers and one line input for connecting the mixer to a building's alarm system. It also features one microphone input with phantom power, gain control, and a ducker that can lower the volume of the music when making announcements.

The mixer also features one stereo output with a zone equalizer, an active crossover, and a separate subwoofer out. The unit does not require a computer to operate. Designed with a simple analog style control panel, you can switch between source 1, source 2, and remote control with the turn of a knob. An included security plate can be installed over the front panel to prevent changes to the unit's controls once configured.

The mixer works with optional CSM remote wall controllers, allowing you to remotely adjust the input source and volume level. Additional output zones may be added to the system by connecting multiple CSM mixers together using a Cat5 cable plugged into the unit's RJ-45 link ports. With the above features, the mixer provides flexible options for different sound applications such as in restaurants, retail stores, yoga studios, and other commercial establishments.

LevelGuard optimizes the compression of incoming source signals to keep the overall output signal under control. The threshold of the LevelGuard is adjustable by turning the threshold pot on the front of the mixer
AutoWarmth optimizes the tonal balance and musical character of incoming source signals
Mic Minimum
The mic minimum trim pot sets the minimum output volume level for the microphone. The main mic volume control knob will not go below this level, ensuring the microphone can be heard during announcements
Source 1 Priority and Priority Hold
The source 1 priority on/off button determines whether audio from source 1 will override audio from source 2. The priority hold pot adjusts the time it takes for the other input sources to take over after the priority source is finished, such as when the music resumes after a page is complete
A built-in limiter prevents the signal from clipping
Mono and Stereo Operation
A push button switches the output of the mixer between mono and stereo
Music Volume Ducking for Microphone Announcements
The mixer allows you to adjust the ducking depth for lowering the music volume while using the microphone input for paging or to make announcements. The ducking depth can be set between cutting the music out completely to no ducking at all during announcements
Remote Controls
The mixer can be controlled by the optional JBL CSM remote controls CSM-V, CSR-2SV, and CSR-3SV which connect to the mixer's RJ-45 remote port
In the Box
JBL CSM -21 2 x 1 Stereo Public Address Mixer
  • Power Supply
  • Security Plate
  • 2 x Rack Mounting Brackets
  • Limited 5-Year Warranty
  • Table of Contents
    • 1Description
    Line Inputs
    Type 2 x stereo, unbalanced RCA connectors
    Nominal Sensitivity -10 dBV
    Input Impedance 20 kΩ
    Maximum Input +12 dBu
    Equalization Bass ±10 dB @ 80 Hz,
    Treble ±10 dB @ 8 kHz with 6 dB/octave shelf
    Type 1 x balanced, 0.2" (5.08 mm) Euroblock connector
    Input Impedance 2 kΩ
    Noise EIN <117 dB, 150 Ω, DSP band-limited 120 to 8,0000 Hz, BW24
    Maximum Input +20 dBu
    Equalization Bass ±6 dB @ 250 Hz
    Treble ±6 dB @ 2 kHz with 6 dB/octave shelf
    CMRR >40 dB, typically >55 dB @ 1 kHz
    Preamp Overall Gain +30 dB to +60 dB adjustable
    Phantom Power +48 VDC at 10 mA
    Type 1 x stereo (left, right, sub) balanced 1/8" (3.5 mm, Euroblock connector)
    Output Impedance 120 Ω balanced
    Maximum Output Level +20 dBu
    Crossover Frequencies
    Left and right in: 125 Hz high-pass (BW24)
    Sub in: 125 Hz low-pass (BW24)
    Left and right out: 20 to 20,000 Hz
    Sub out: 20 to 20,000 Hz (mono summed)
    LED Indicators Source inputs:
    Signal present LED (turns on at -20 dBu)
    Signal clip LED (turns on at +10 dBu)
    Mic input:
    Signal present LED (turns on at -20 dBu)
    Signal clip LED (turns on at +18 dBu)
    System Performance
    Frequency Response 20 to 20,000 Hz, +/-0.1 dB
    Dynamic Range 104 dB, A-weighted, 20 to 20,000 Hz
    Converter Mic input implements dbx Type IV conversion system
    Sample Rate 48 kHz
    Crosstalk >75 dB
    THD & Noise 0.005% typical at +4 dBu, 20 to 20,000 Hz, 0 db gain
    Rear Panel Connections
    Direct Inputs 1 x Balanced, 1/4" (5.08 mm) Euroblock connector
    Input impedance: 10 kΩ
    Maximum input: +20 dBu
    Frequency response: 20 to 20,000 Hz
    Mute 1 x 2-pin 1/4" (5.08 mm) Euroblock connector
    Connecting the pins mutes all source inputs, does not mute mic input.
    Paging 1 x 2-pin 1/4" (5.08 mm) Euroblock connector
    Connecting the pins will assign a page to the output zone
    Link Source: 1 x RJ45 port requires CAT3 cable or higher with maximum length 7.9' (2.4 m)
    Main:1 x RJ45 port requires CAT3 cable or higher with maximum length 7.9' (2.4 m)
    USB 1 x USB Type B port for firmware updates
    Power Consumption 10 W
    Power Requirements 100 to 240 V thermal fuse in external transformer
    Rack Mountable Yes with included brackets
    Dimensions (H x W x D) 19.0 x 1.8 x 7.0" (48.3 x 4.6 x 17.8 cm)
    Weight 5.3 lb (2.4 kg)

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