AVIXA Updated CTS Exam Questions and Answers by reyan

When upgrading or modernizing a facility, it is essential to check that wireless microphones are operating on acceptable radio frequencies. This ensures compliance with local regulations and avoids interference with other wireless devices. The radio frequency spectrum can change over time, and certain frequencies may be reallocated or restricted, making it necessary to verify that existing equipment is still compliant and operational within the allowable frequency bands.

Listener 2

In sound propagation, every doubling of distance from a sound source generally results in a decrease of approximately 6 dB in sound level due to the inverse square law. Conversely, when moving closer to the sound source, the sound level increases by approximately 6 dB each time the distance is halved.

Given Listener 4 is at 20 feet from the speaker:

Listener 3 is at 15 feet, which is closer but not a direct halving of Listener 4's distance, so the change is less than 6 dB.

Listener 2 is at 10 feet, which is half the distance of Listener 4 (20 feet). This halving of distance results in a sound level increase of approximately 6 dB.

Listener 1 is at 5 feet, which is closer than Listener 2 and results in a higher increase in dB compared to Listener 4.

CTS Technology Specialist Reference

Understanding sound level changes over distance is essential in AV system design to ensure balanced audio coverage. The CTS materials cover the inverse square law extensively, explaining how sound pressure levels change as the distance from the sound source varies. Listener 2, at half the distance from Listener 4, receives sound at +6 dB compared to Listener 4, aligning with this principle.

The question relates to viewer distance based on image height, which is part of image size and viewing distance calculations under AVIXA design principles.

This screen is 65" diagonal with a 16:9 aspect ratio. The image height is given as 31.6" (80.2 cm).

According to the AVIXA CTS Exam Guide, the formula for minimum (nearest) viewing distance for a basic decision-making (BDM) environment is:

Minimum viewing distance = 1.5 × Image Height

— AVIXA CTS Exam Guide, 5th Edition – Chapter 7: Display Design, p. 155

So in this case:

Image Height = 31.6 inches (80.2 cm)

Nearest Viewing Distance = 1.5 × 31.6 inches = 47.4 inches ≈ 4'8" (1.4 m)

Thus, the correct and closest viewing distance to ensure readability and visual comfort is Option C: 4'8" (1.4 m).

Note: For analytical decision-making (ADM), a shorter distance might be used (up to 4× height), and for passive viewing (PV), longer distances are acceptable. But this question implies nearest (minimum) viewer positioning, hence the 1.5x rule applies.

???? References:

AVIXA CTS Exam Guide, 5th Edition – Chapter 7: Display Design, p. 150–160

AVIXA Design Reference: Image Size for 2D Content in Audiovisual Systems (ANSI/AVIXA V202.01:2016)

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