Ch. 15 (Paging) Flashcards
0
Q
Jet airplane takeoff
A
Exceeds 100 dB
1
Q
Types of paging systems
A
Centrally amplified
Distributed amplified
2
Q
Levels above 95 dB
A
Unsuitable for paging
except in extreme situations
3
Q
Ceiling loudspeaker distribution patterns:
A
Hexagonal
Square
4
Q
General rule: one loudspeaker for every ___
A
600 sq’
5
Q
Hallway speaker placement
A
On center @ 8’ intervals
6
Q
If ceiling speakers aren’t possible in hallways, use ___
A
Bi-directional wall mounts on alternating sides
7
Q
Wall-mounted speakers
A
8’-12’ AFF
8
Q
Separation between speakers
A
Twice the ceiling height
9
Q
A properly designed system should be ___ DB above ambient noise
A
10 dB
10
Q
Ambient noise level of a doctors office
A
55 dB
11
Q
Two most commonly used voltages
A
25 V & 70 V
12
Q
Speakers are rated at 3.3’ using ___ of power input
A
1 watt
