Biamp Cambridge Qt 300, Инструкция по установке и эксплуатации

Страница: 13 / 38

13
Table 1
Zone Type Ceiling Height Vol Level Intended Result
(at listener ear level)
Open Office Areas < 9’ (2.75m) 11-14 45-48 dBA
Open Office Areas 9’-10’ (2.75-3m) 12-15 45-48 dBA
Open Office Areas 10’-11’ (3.0-3.3m) 13-16 45-48 dBA
Open Office Areas 11’-12’ (3.3-3.6m) 14-17 45-48 dBA
Open Office Areas >12’ (3.6m) 15-18 45-48 dBA
Private Office Areas ALL 4-8 38-42 dBA
Installing Paging or Music to the Audio Inputs
1 Be sure power is OFF by unplugging power cord from wall outlet.
2 To install 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 To install unbalanced audio input (typical of music systems):
• Mono Signals: Connect signal wire to both L and R at input A or B. Connect the ground wire to GND.
• 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 Installing 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 your
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.