AVIXA CTS - Certified Technology Specialist

The frequency identified by the numbers above each slider of a graphic equalizer is the center frequency. The center frequency is the specific frequency that each slider controls, allowing the user to boost or cut the amplitude of that frequency and those in its immediate vicinity. This helps in fine-tuning the audio signal to achieve the desired sound quality.

Quality of Service (QoS) in networking refers to the ability to manage and prioritize network traffic to ensure that the most important data receives the highest priority. This is particularly important for ensuring the performance of critical applications and services, such as video streaming, VoIP, and other latency-sensitive services. QoS mechanisms can allocate bandwidth, control jitter, and minimize latency, thereby improving the overall performance and reliability of the network.

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.

When estimating how long a task will take, it’s not enough to know what needs to be done (scope)—you must also factor in resource availability (e.g., technicians, equipment, or tools). If resources are limited, even simple tasks can take longer.

“Task duration depends on the work required and the availability of human and material resources.”

— CTS Exam Guide, Project Scheduling and Time Estimation

Changing the default passwords is the most important step to secure AV equipment before connecting it to the network. Default passwords are widely known and can easily be exploited by hackers. By changing these passwords to strong, unique ones, the risk of unauthorized access is significantly reduced. This is a fundamental security practice to protect networked equipment. Ensuring strong passwords helps prevent potential breaches, safeguarding the AV equipment and the broader network it is connected to.

In the provided Gantt chart, Activity C is scheduled to start after the completion of Milestone X. This is evident as the milestone symbol (diamond) for Milestone X appears right before the beginning of Activity C, indicating that Activity C is dependent on the completion of Milestone X.

Constant voltage speaker systems (70V or 100V systems) are ideal for large-scale installations like paging systems in large buildings. These systems allow easy distribution over long distances with minimal signal loss and support multiple speakers connected to the same amplifier. Near field (Option A) is for close-proximity applications. Line arrays (Option B) are used in concert settings, and direct-coupled systems (Option C) are not as efficient for large-scale distributed audio.

CTS References: AVIXA CTS Exam Guide, Chapter on Audio Distribution; CTS Handbook, Section on Constant Voltage Systems.

=========================

The most important factor during the development of an AV project scope is understanding stakeholders' requirements. This ensures the project aligns with the needs and expectations of those who will be using or impacted by the system, making it central to project success.

CTS Technology Specialist Reference

CTS training underscores the importance of gathering detailed stakeholder requirements to define a project scope that meets the client’s objectives and use cases.

During an initial site survey, understanding the overall scope of the AV solution provides the foundational insight needed for designing a system that meets client requirements. This ensures alignment with objectives and informs subsequent phases of the project.

CTS Technology Specialist Reference

The CTS curriculum advises focusing on the AV solution scope to guide design and implementation processes effectively, ensuring client needs are addressed.

In a 70 V distributed audio system, the total power requirement is the sum of the power taps of all speakers. With 12 speakers each tapped at 30 W:

12 speakers × 30 W = 360 W

It's standard practice to add a 20% headroom to accommodate potential future expansions and to ensure the amplifier isn't operating at full capacity continuously:

360 W × 1.2 = 432 W

Therefore, an amplifier that can deliver at least 432 W at 70 V is appropriate. Option A provides 500 W at 70 V, which meets this requirement with additional headroom, making it the best choice.