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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
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
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