Click play buttons to hear and identify common noise and interference issues. Includes support links to relevant troubleshooting articles and bulletins.

60 Cycle Hum

Replicated by exposing unshielded condenser element to AC to DC transformer.

Support Links:

• Hum Caused by Ground Loops - Definition and Cures
• Hum pickup on SM87
• Microphone Hum Problem

Comb Filtering

Sibilant sound of “SH” between two active microphones.

Support Links:

• Theater Audio - Comb Filter Distortion From Close Proximity Of Lavalier Mics
• Two MX mics on one lectern / podium

GSM Noise

Cell Phone, Mobile PDA, and Wireless Devices near computer speakers.

Support Links:

• Cell Phone, GSM, and PDA Interference - affecting other devices?
• How to identify MX microphones with improved resistance to GSM interference
• Cell Phone Frequencies / Wireless Communications Devices

Interference from Motion Detector

Ticking noise injected into wireless system by a nearby motion detector.

Support Links:

• Selection and Operation: Wireless Microphone Systems (PDF)

Music with Automixer

Sustained guitar chords through SCM810 being gated.

Support Links:

• Feedback in a church
• Disabling Automatic Mixing Function By Channel
• Submixing into an automatic mixer

PSM Dropout

Musical passage experiencing multipath dropout.

Support Links:

• PSM700 Dropouts at close range
• Causes of wireless system dropouts
• Sound dropping out of PSM400

RF Dropout

Testing wireless microphone while experiencing loss of line of sight.

Support Links:

• Causes of wireless system dropouts
• Choosing a wireless microphone
• Wireless for Health Clubs

TV Audio Interference

Dropouts resulting from operating a wireless system on the audio carrier of an active analog TV station.

Support Links:

• What television stations should I avoid for my wireless microphone?
• RF spectrum analyzer
• Causes of wireless system dropouts