JBL CSM21 2x1 Stereo Public Address Mixer


2 Stereo Inputs and 1 Stereo Output Separate Subwoofer Output on Euroblock Standalone Operation Without a Computer Ducks Music for Microphone Announcements


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.

Line Inputs                                                                                                                          
Type2 x stereo, unbalanced RCA connectors
Nominal Sensitivity-10 dBV
Input Impedance20 kΩ
Maximum Input+12 dBu
EqualizationBass ±10 dB @ 80 Hz,
Treble ±10 dB @ 8 kHz with 6 dB/octave shelf
Type1 x balanced, 0.2" (5.08 mm) Euroblock connector
Input Impedance2 kΩ
NoiseEIN <117 dB, 150 Ω, DSP band-limited 120 to 8,0000 Hz, BW24
Maximum Input+20 dBu
EqualizationBass ±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
Type1 x stereo (left, right, sub) balanced 1/8" (3.5 mm, Euroblock connector)
Output Impedance120 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 IndicatorsSource 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 Response20 to 20,000 Hz, +/-0.1 dB
Dynamic Range104 dB, A-weighted, 20 to 20,000 Hz
ConverterMic input implements dbx Type IV conversion system
Sample Rate48 kHz
Crosstalk>75 dB
THD & Noise0.005% typical at +4 dBu, 20 to 20,000 Hz, 0 db gain
Rear Panel Connection                                                                                                      
Direct Inputs1 x Balanced, 1/4" (5.08 mm) Euroblock connector
Input impedance: 10 kΩ
Maximum input: +20 dBu
Frequency response: 20 to 20,000 Hz
Mute1 x 2-pin 1/4" (5.08 mm) Euroblock connector
Connecting the pins mutes all source inputs, does not mute mic input.
Paging1 x 2-pin 1/4" (5.08 mm) Euroblock connector
Connecting the pins will assign a page to the output zone
LinkSource: 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)
USB1 x USB Type B port for firmware updates
Power Consumption10 W
Power Requirements100 to 240 V thermal fuse in external transformer
Rack MountableYes 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)
Weight5.3 lb (2.4 kg)

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See Also : Mixer, JBL