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Installing Paging or Music to the Audio Inputs

1. Be sure power is OFF by unplugging power cord from wall

outlet.

2. Balanced Audio Input: (most often, but not always characteristic

of paging systems.) Connect signal wires to + and - at input A or

B. Connect the shield to GND at the audio source.

3. Unbalanced Audio Input: (typical of music systems.)

a. Mono Signals: Connect signal wire to both L and R at

input A or B. Connect the ground wire to GND.

b. Stereo Signals: Connect signal wires to L and R at

input A or B. Connect the ground wire to GND.

4. If a music source is to be connected, using Input B allows

emergency music shut-off. See Contact Closures below.

Installing Contact Closures

The QtPro provides an instant shut-off capability for masking and/ or

audio Input B if connected to a contact closure interface. The contact

closure utilizes the same style connector as audio Inputs A and B (4-

pin).

To leverage this feature for masking, connect a two-conductor cable

to the two connectors, labeled M3V and MGND. To leverage this

feature for Audio Input B, connect a two-conductor cable to the two

connectors, labeled B3V and BGND.

The other end of these conductors (treated as pairs/circuits) can be

terminated on closure mechanisms of choice.

1. To shut off masking, form a connection between the two “M”

conductors.

2. To resume masking, break the connection (Don’t break the

connectors as you may want to reuse them).

The contact closure for audio Input B follows the same logic.

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CAMBRIDGE QT Guida di Installazione Pagina 12