CAT Problem Solving and Troubleshooting 4

Question 1

A console channel with a condenser microphone produces no signal even though phantom power is enabled. Swapping to a known-good mic on the same channel works. The most likely fault is:

Accepted Answer

Damaged microphone or its internal electronics

Answer

Failed phantom power supply on the console

Answer

Incorrect gain staging on the channel

Answer

A broken monitor send

Question 2

You are troubleshooting a system where the left and right channels are reversed at the main speakers. The console output is correct. Where is the most likely wiring error?

Accepted Answer

In the speaker cable runs or amplifier input patch

Answer

Inside the microphone capsule

Answer

In the digital snake's AES routing

Answer

At the console insert points

Question 3

During an outdoor event, the sound system performs well until temperature drops significantly, after which audio becomes intermittent. The most likely cause is:

Accepted Answer

Cold-induced connector contact failure or cracked solder joints

Answer

Increased air density improving acoustics

Answer

Lower ambient humidity affecting speaker cones

Answer

Reduced amplifier power at cold temperatures

Question 4

A room's reverb time is causing intelligibility problems. The system DSP has already been optimized. What is the most effective remaining solution?

Accepted Answer

Add acoustic treatment to reduce room reflections

Answer

Increase loudspeaker SPL output

Answer

Switch to a higher-impedance speaker cable

Answer

Lower the crossover frequency

Question 5

An amplifier repeatedly shuts down after several minutes of operation. The fan is running but the heatsink is extremely hot. What is the cause?

Accepted Answer

Thermal protection activating due to inadequate cooling airflow

Answer

Clipping protection due to excessive input signal

Answer

DC offset protection triggered by output fault

Answer

Incorrect speaker impedance causing over-current

Question 6

You suspect a pin 2 vs pin 3 polarity reversal in an XLR cable. Which test most efficiently confirms this?

Accepted Answer

Use a polarity tester or cable tester that checks pin continuity and mapping

Answer

Measure AC voltage across pins 2 and 3 with a multimeter

Answer

Listen for phase cancellation when combining two mics

Answer

Check the cable jacket color code

Question 7

A digital audio network experiences random dropout events logged as 'priority errors' by the system. The most likely cause is:

Accepted Answer

Network switch not configured for audio quality of service (QoS) prioritization

Answer

Incorrect speaker impedance on one zone

Answer

Excessive phantom power draw

Answer

Wrong crossover slope setting in DSP