CTS Conducting AV Site Surveys 3 — Questions and Answers
Question 1: According to AVIXA standards, what is the maximum distance a viewer should sit from a display, expressed as a multiple of screen height?
- 3 times the screen height
- 4 times the screen height
- 6 times the screen height (Correct answer)
- 9 times the screen height
Correct answer: 6 times the screen height
AVIXA's DISCAS standard recommends a maximum viewing distance of 6 times the screen height for HD content to preserve image detail.
Question 2: What does measuring RT60 during an AV site survey tell you about a space?
- The room's power consumption for planned AV systems
- How long it takes for sound to decay by 60 dB, indicating the room's reverberation characteristics (Correct answer)
- The maximum distance sound travels before reflecting off a surface
- The maximum SPL the room can sustain without structural resonance
Correct answer: How long it takes for sound to decay by 60 dB, indicating the room's reverberation characteristics
RT60 measures sound decay time, directly affecting speech intelligibility and determining whether acoustic treatment is needed.
Question 3: What is the maximum horizontal off-axis viewing angle from a display's centerline that AVIXA recommends for acceptable image quality?
- 20 degrees
- 30 degrees
- 35 degrees
- 45 degrees (Correct answer)
Correct answer: 45 degrees
AVIXA standards set a maximum horizontal off-axis viewing angle of 45° from the display centerline before image quality degrades unacceptably.
Question 4: When surveying a room with a coffered ceiling for speaker placement, what is the primary acoustic concern?
- Uneven acoustic coverage due to recessed cavities creating dead spots and additional reflections (Correct answer)
- Difficulty mounting speakers to the coffered surface in an aesthetically acceptable way
- Fire code restrictions specifically prohibiting speaker placement in coffered ceilings
- Coffered ceilings prevent the use of distributed audio systems entirely
Correct answer: Uneven acoustic coverage due to recessed cavities creating dead spots and additional reflections
Coffered ceiling recesses create uneven sound distribution and additional reflections that complicate speaker coverage planning.
Question 5: What is throw ratio, and why is it measured during an AV site survey?
- The ratio of screen brightness to ambient light, used to select projector lumens
- The ratio of audio delay to speaker distance, used to time-align distributed speakers
- The ratio of projector distance to image width, used to determine projector placement (Correct answer)
- The ratio of room length to room width, used to assess acoustic suitability
Correct answer: The ratio of projector distance to image width, used to determine projector placement
Throw ratio (distance ÷ image width) determines how far a projector must be placed from the screen to achieve the desired image size.
Question 6: A conference room has east-facing windows that admit direct sunlight during 9 AM meetings. What is the best solution to document in the survey?
- Recommend scheduling all meetings after noon to avoid sunlight interference
- Specify motorized blackout shades and orient the primary display to minimize glare paths (Correct answer)
- Install a significantly brighter projector to overcome the direct sunlight
- Permanently seal the windows with opaque wall panels
Correct answer: Specify motorized blackout shades and orient the primary display to minimize glare paths
Motorized blackout shades control light at its source while preserving window function, and display orientation adjustment minimizes glare on participants.
Question 7: When surveying a tiered auditorium for a front-projection system, what dimension most critically constrains screen size selection?
- The width of the main entry doors
- The height of the back row seats above the floor
- The total depth of the stage area
- The floor-to-ceiling height at the projection screen wall (Correct answer)
Correct answer: The floor-to-ceiling height at the projection screen wall
The ceiling height at the projection wall establishes the maximum screen height, which in turn determines usable screen size and projector requirements.
CTS Conducting AV Site Surveys 3
According to AVIXA standards, what is the maximum distance a viewer should sit from a display, expressed as a multiple of screen height?