CTS AV Site Surveys 4 — Questions and Answers
Question 1: During an AV site survey, you discover the ceiling is a suspended acoustic tile grid rated for 4 lbs per tile. A projector mount weighs 18 lbs. What is the correct action?
- Attach the mount directly to the grid at multiple tile intersections to distribute weight
- Span a support structure to structural elements above the drop ceiling before mounting (Correct answer)
- Use toggle bolts through the tile to anchor into the air plenum
- Replace two tiles with a custom aluminum plate and mount to that
Correct answer: Span a support structure to structural elements above the drop ceiling before mounting
Any load exceeding the tile grid's rating must be transferred to structural elements above the drop ceiling using threaded rod or similar bridging hardware.
Question 2: A site survey reveals an existing HVAC duct running directly through the planned projection path. Which document should capture this conflict for the design team?
- Punch list
- As-built drawing
- Site survey report with annotated floor plan (Correct answer)
- Request for Information (RFI) to the AV installer
Correct answer: Site survey report with annotated floor plan
Site survey reports with annotated floor plans document existing conditions and conflicts so the design team can adjust equipment placement or sightlines.
Question 3: When measuring ambient light levels during an AV site survey, which unit of measure is most commonly recorded?
- Lumens
- Candelas per square meter (nits)
- Foot-candles (fc) or lux (Correct answer)
- ANSI lumens
Correct answer: Foot-candles (fc) or lux
Ambient light at a surface is measured in foot-candles (fc) or lux using a light meter, which informs display brightness requirements.
Question 4: A surveyor finds that a conference room has floor-to-ceiling glass walls on two sides. Which AV design concern does this primarily raise?
- Insufficient structural support for display mounting
- Excessive ambient light and potential glare on displays (Correct answer)
- Inadequate conduit pathways for cabling
- Risk of RF interference with wireless microphones
Correct answer: Excessive ambient light and potential glare on displays
Glass walls allow uncontrolled daylight ingress, causing glare and dramatically raising ambient light levels that compete with display brightness.
Question 5: During a site survey for a large auditorium, you measure a reverberation time (RT60) of 3.2 seconds. What does this indicate for the audio system design?
- The room is nearly anechoic and will require artificial reverb
- Speech intelligibility will be poor and acoustic treatment or highly directional speakers are needed (Correct answer)
- The room meets standard speech intelligibility requirements without modification
- Subwoofer placement must be along the rear wall only
Correct answer: Speech intelligibility will be poor and acoustic treatment or highly directional speakers are needed
An RT60 of 3.2 seconds is far too long for speech clarity; values above ~1.0 second in conference/presentation spaces significantly degrade intelligibility.
Question 6: What is the primary reason an AV surveyor should verify the electrical panel capacity and available circuits during a site survey?
- To determine the maximum cable run lengths allowed by code
- To ensure sufficient power is available for AV equipment without tripping breakers or sharing circuits with noisy loads (Correct answer)
- To plan the location of control system touchpanels
- To calculate the HVAC load added by AV equipment heat dissipation
Correct answer: To ensure sufficient power is available for AV equipment without tripping breakers or sharing circuits with noisy loads
AV equipment requires dedicated, adequately rated circuits; sharing circuits with HVAC or lighting can cause noise, voltage drop, and reliability issues.
Question 7: A site survey reveals 9-foot ceilings in a training room planned for an 84-inch flat-panel display. Which sightline concern should be documented?
- The display may need to be recessed into the wall to meet ADA clearance
- The top of the display mounted at standard height may be too high for comfortable viewing from rear seats (Correct answer)
- Ceiling height has no impact on flat-panel display placement decisions
- The display must be ceiling-hung rather than wall-mounted at this ceiling height
Correct answer: The top of the display mounted at standard height may be too high for comfortable viewing from rear seats
With low ceilings and a large display, mounting height is constrained, and the top edge may exceed comfortable viewing angles for occupants in rear rows.
CTS AV Site Surveys 4
During an AV site survey, you discover the ceiling is a suspended acoustic tile grid rated for 4 lbs per tile.
A projector mount weighs 18 lbs.
What is the correct action?