CAT Problem Solving and Troubleshooting 3

Question 1

A passive loudspeaker measures 0 ohms across its terminals with an ohmmeter. This indicates:

Accepted Answer

A shorted voice coil or wiring

Answer

The driver is operating normally

Answer

An open crossover inductor

Answer

Correct impedance for an 8-ohm speaker

Question 2

You plug a ¼-inch TRS balanced output into an unbalanced ¼-inch TS input and notice increased noise. The most appropriate fix is:

Accepted Answer

Use a direct box or balanced-to-unbalanced interface

Answer

Use a TRS-to-XLR adapter

Answer

Increase the output gain to overcome the noise

Answer

Replace the cable with a longer one

Question 3

During sound check, the subwoofers produce output but the tops do not. Both are connected to a stereo amplifier. What should you verify first?

Accepted Answer

The amplifier's channel bridging switch or mode setting

Answer

The DSP high-pass filter cutoff

Answer

The console fader levels

Answer

The AC voltage at the rack

Question 4

A wireless microphone receiver shows full RF signal strength but the audio output is silent. The most likely cause is:

Accepted Answer

Mismatched RF frequency between transmitter and receiver

Answer

Transmitter squelch set too high

Answer

Incorrect audio output level on the receiver

Answer

Low battery in the receiver

Question 5

An in-ear monitor system produces a high-pitched whine only when the beltpack is within 3 feet of the transmitter antenna. This is caused by:

Accepted Answer

RF overload or desensitization at the beltpack receiver

Answer

Insufficient battery power in the transmitter

Answer

Incorrect EQ preset on the IEM system

Answer

Open circuit in the earphone cable

Question 6

After connecting a new digital snake, you notice a consistent 20ms of latency added to the signal path. What is the most likely explanation?

Accepted Answer

The snake's internal A/D and D/A conversion processing time

Answer

Incorrect clock source causing sample-rate conversion

Answer

A ground loop in the analog returns

Answer

An incorrect EQ curve in the DSP

Question 7

A line array cluster produces comb filtering artifacts in the coverage zone. The first corrective action should be:

Accepted Answer

Verify cabinet splay angles and inter-element delay alignment

Answer

Replace the high-frequency drivers

Answer

Increase the subwoofer level

Answer

Switch from stereo to mono