Mixed Deck — All CAT Topics Flashcards

Two wireless microphone systems on nearby frequencies cause intermodulation products that land on a third system's frequency. This is best resolved by:

Answer: Recalculating and assigning intermod-free frequencies using coordination software

Intermodulation is solved by using frequency coordination software to calculate and assign frequencies that avoid IM products on active channels.

What is the most important foundational concept in Audio Signal Flow?

Answer: Understanding core principles and their practical application in Audio Signal Flow

Core principles provide the foundation for all decision-making and practice in Audio Signal Flow.

What standard sample rate and bit depth is used by the AES67 networked audio interoperability standard?

Answer: 48 kHz / 24-bit (primary reference, with others supported)

AES67 specifies 48 kHz as the primary reference sample rate and supports 16- and 24-bit linear PCM, though 96 kHz is also supported as an option.

What is jitter in a digital audio system?

Answer: Timing variations in the digital clock that cause audible noise or distortion

Jitter is the variation in timing of the digital sampling clock; even small inconsistencies can cause phase noise and distortion in the reconstructed audio signal.

A client requests a complex sound system but has a limited budget. What is a professional way to address this?

Answer: Propose a scaled-down version that meets key needs within budget

When a client's request exceeds their budget, a professional technician should act as a consultant. Proposing a scaled-down system demonstrates an understanding of their financial constraints while still aiming to meet their most critical audio needs. This approach offers a practical solution, builds trust, and keeps the project viable.

What does the acronym AES/EBU stand for in professional audio?

Answer: Audio Engineering Society / European Broadcasting Union

AES/EBU (Audio Engineering Society / European Broadcasting Union) is a standard digital audio interface that carries two channels of digital audio over a balanced 110 Ω XLR cable.

Which wire gauge is most commonly specified for low-impedance loudspeaker runs in commercial audio installations?

Answer: 14 AWG

14 AWG wire is commonly specified for commercial loudspeaker runs as it provides adequate current capacity while keeping cable resistance losses acceptably low.

How should risk be managed in Sound System Design?

Answer: Through identification, assessment, mitigation strategies, and ongoing monitoring of potential risks

Effective risk management involves a systematic process of identifying, evaluating, and addressing potential threats.

What quality metrics are most important in Mixing and Processing?

Answer: Measurable outcomes, process compliance, and stakeholder satisfaction

Quality in Mixing and Processing is measured through multiple dimensions including outcomes, processes, and satisfaction.

How does technology impact modern practices in Sound System Design?

Answer: Technology improves efficiency, accuracy, and access to information while requiring new skills

Technology enhances capabilities while also requiring practitioners to develop new competencies.

What is the Nyquist theorem's requirement for the sample rate relative to the highest audio frequency to be captured?

Answer: The sample rate must be at least twice the highest frequency

The Nyquist theorem states that to accurately reconstruct a signal, the sample rate must be at least twice the highest frequency present in the signal.

After a firmware update to a DSP, all preset scenes fail to load. The most appropriate first step is:

Answer: Check the firmware release notes for preset compatibility changes and re-import scenes

Firmware updates sometimes change preset file formats; checking release notes and re-importing or converting scenes is the correct first response.

What is the primary function of an audio mixer in a commercial sound system?

Answer: Combining and adjusting multiple audio inputs

The primary function of an audio mixer in a commercial sound system is to combine, balance, and adjust the levels of multiple audio input signals. It allows a technician to blend sounds from various sources, such as microphones, instruments, and playback devices, into a cohesive output mix. Mixers also often provide equalization and effects processing for further sound shaping.

What role does continuing education play in Microphone Techniques?

Answer: Keeping practitioners current with evolving best practices and new developments

Continuing education ensures practitioners stay current with advances in their field.

Which loudspeaker enclosure type uses a tuned port to extend low-frequency response?

Answer: Bass reflex (ported)

A bass reflex enclosure uses a tuned port or slot that resonates to reinforce bass frequencies and extend the low-frequency response.

When working with a team on a large project, what is a critical practice for ensuring clear communication?

Answer: Holding regular project updates and documentation sharing

On large projects, clear and consistent communication is paramount for team success. Regular project updates ensure everyone is aware of progress, challenges, and changes, while shared documentation provides a single source of truth for technical details and decisions. This prevents misunderstandings, reduces errors, and keeps the project on track.

A hospitality client requests that AV installation work be limited to overnight hours to avoid guest disruption. This constraint should FIRST be addressed in:

Answer: The project contract or scope of work before work begins

Work-hour restrictions affect labor costs, scheduling, and crew availability and must be contractually defined before the project starts to avoid disputes.

What is the purpose of a delay line in a distributed audio system with multiple speaker zones?

Answer: Synchronize audio with distant speakers to avoid echo

Delay lines time-align audio signals so that sound from distant speakers arrives at listeners simultaneously with nearby speakers, preventing echo or comb filtering.

Which financial metric BEST measures whether a commercial AV project is on budget at a given point in time?

Answer: Cost-to-complete vs. remaining budget

Comparing cost-to-complete against remaining budget shows whether the project will finish within the approved budget based on current spending trends.

What is the recommended dB level for nominal line-level signals in professional (+4 dBu) audio equipment?

Answer: +4 dBu

+4 dBu (approximately 1.23V RMS) is the standard nominal operating level for professional balanced audio equipment.