NOTE: The Qt100 control module does not have contact closure capabilities.
Input
Intended Source
Muted Upon Contact Closure
Input A
Paging
No
Input B
Background Music
Yes
An Important Note on Paging Signals
It is important to pay attention to the control module’s audio input requirements when implementing paging with your
sound masking system. All Qt control modules require a dry line-level signal from the paging source. The specification
for a nominal pro audio line-level signal is +4 dBu, 1.228 (Vrms), 1.737 (Vpk). However, Qt control modules can handle
signals that range from 1/2 to 2 times pro audio line levels. “Dry” emphasizes that the module’s paging inputs are not
telephone interfaces and must never see dial tone, ring voltage, battery current, etc.. This means that a typical FXO/FXS
output is NOT directly compatible and requires the use of a third-party paging controller.
Connecting an Input
Be sure to power off the control module by unplugging the power cord from the wall outlet. Use the diagrams below to
connect the cables from your audio input to the back of the control module. For the Qt 100, you will need to remove the
plastic backing. For the Qt 300/600, you will need to flip the control module down in the housing to access the inputs.
Inputs A and B are clearly labeled on the PCB of the Qt 300/600.
Balanced Audio Inputs
Connect the corresponding signal wires to the “+” and “-” ports on the control module’s input.
Unbalanced Audio Inputs
Mono Signals
Connect the signal wire to both the “L” and “R” ports on the module’s input.
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