AVIXA CTS Dumps

To determine the Sound Pressure Level (SPL) at 2 meters from the loudspeaker, we use the inverse square law of sound. The inverse square law states that for each doubling of the distance from the sound source, the SPL decreases by 6 dB.

Given:

Sensitivity: 90 dB SPL at 1 meter with 1 watt.

Distance: 2 meters.

When the distance is doubled from 1 meter to 2 meters, the SPL will decrease by 6 dB. Therefore: 90 dB SPL - 6 dB = 84 dB SPL at 2 meters. However, since the answer choices are given and no mistake has been indicated in the answer choices themselves, the correct answer based on typical question logic should be:

90 dB SPL−6 dB=84 dB SPL90 \text{ dB SPL} - 6 \text{ dB} = 84 \text{ dB SPL} 90 dB SPL−6 dB=84 dB SPL

Therefore, the SPL at the listener 2 meters away is 84 dB SPL.

The light output of a projection system is typically measured in lumens, which quantify the total amount of visible light emitted by the projector. Lumens measure the projector's brightness, making it a standard metric for comparing different projectors' output capacities.

Lux is used to measure illuminance or the amount of light falling on a surface.

Footcandles is another unit of illuminance, similar to lux but based on the imperial system.

Contrast ratio describes the difference in luminance between the brightest white and the darkest black a projector can produce, not the brightness itself.

CTS Technology Specialist ReferenceAccording to CTS training materials, projector brightness should be specified in lumens, which provides a clear indication of the projector's suitability for different environments and screen sizes.

Subwoofers are generally not required for a PA system focused solely on speech reinforcement because they reproduce low-frequency sounds that are not necessary for intelligibility of spoken word. Speech reinforcement systems typically prioritize clarity in the mid and high frequencies.

CTS Technology Specialist ReferenceThe CTS curriculum states that speech reinforcement systems should prioritize mid and high frequencies, which are critical for voice clarity, while subwoofers are typically used in music reinforcement for low-frequency response.