Topic 15, Distributed Paging Systems Flashcards
What is the recommended distance between ceiling mounted speakers in a hallway with heavy traffic?
A. 2.4 m (8 ft)
B. 3.7 m (12 ft)
C. 4.9 m (16 ft)
D. 6 m (20 ft)
A. 2.4 m (8 ft)
A space has all hard surfaces including architecture and furnishings. The audio programming produced from the distributed sound system has become unintelligible.
Which of the following will NOT mitigate the problem?
A. Add tapestries to the walls.
B. Provide additional speakers at lower output.
C. Increase the volume to the existing speakers.
D. Reduce the distance of the existing speakers to the listener.
C. Increase the volume to the existing speakers.
What are the three typical voltages used in centrally amplified paging systems?
A. 24, 48, and 90
B. 25, 70, and 100
C. 25, 90, and 120
D. 48, 90, and 120
B. 25, 70, and 100
Using the sound pressure level (SPL) method of approximating distance and power, calculate the power required to produce 89 dB at 4 m (13.1 ft) with a loud speaker that is rated at a SPL of 95 dB. What input power level (in watts) is required to appropriately power the speaker?
A. 1 watt
B. 2 watts
C. 4 watts
D. 8 watts
C. 4 watts
You are designing a paging system for a 588 sq m (6325 sq ft) open office space. Due to architectural features of the ceiling, wall mounted speakers must be used. Following the general rule about wall mounted speaker placement, how many speakers should be installed?
A. Eight
B. Ten
C. Twelve
D. Fourteen
C. Twelve
What is the highest typical ambient noise level where audio paging becomes unintelligible?
A. 75 dB
B. 85 dB
C. 95 dB
D. 105 dB
C. 95 db
What element is typically NOT part of a paging system?
A. Strobe
B. Distribution
C. Amplification
D. Loudspeakers
A. Strobe
You are designing a four story retail mall and multiple sound systems within it. Which system should you design to support general music programming within common retail areas?
A. Distributed paging
B. Life safety
C. Sound masking
D. Sound reinforcement and playback
D. Sound reinforcement and playback
A properly designed distributed paging system will provide a sound pressure level (SPL) for audio paging that is between ________ above ambient noise level.
A. 3 dB and 6 dB
B. 6 dB and 10 dB
C. 10 dB and 20 dB
D. 20 dB and 55 dB
C. 10 dB and 20 dB
In a hallway with normal traffic, ceiling mounted speakers should be placed ________ times the corridor height, minus the ________.
A. Two; average height of listener’s ear
B. Two; width of corridor
C. Three; average height of listener’s ear
D. Three width of corridor
A. Two; average height of listener’s ear
You are designing a restaurant located within a retail mall. The ambient noise level of the restaurant is 70 dB. The ambient noise level of the mall common space is 75 dB. What is the MINIMUM sound pressure level (SPL) that should be used when designing the paging system within the restaurant?
A. 70 dB
B. 75 dB
C. 80 dB
D. 85 dB
C. 80 db
For design purposes, loudspeakers are rated for a measured sound pressure level (SPL) at:
A. 1 m (3.3 ft) from the loudspeaker with 1 watt of power input
B. 1 m (3.3 ft) from the loudspeaker with 2 watts of power input
C. 3 m (10 ft) from the loudspeaker with 1 watt of power input
D. 3 m (10 ft) from the loudspeaker with 2 watts of power input
A. 1 m (3.3 ft) from the loudspeaker with 1 watt of power input
