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Symptom
Intelligibility of sound
from microphone is poor
Microphone connected,
input LEDs are off
Alarm/priority signal is
not clear
Cannot achieve required
frequency response at
100 Hz
Cannot achieve required
frequency response at
5 kHz
Possible cause
Low frequency masking
Poor microphone user
techniques
Phantom power not turned on
Input level too low
Microphone needs higher
phantom voltage
Microphone/lead/connectors
faulty
Override DIL switch not set to
allow this function
Speech enhancement filter
turned on
Parametric MLC not set correctly
Frequency dependent losses too
high for parametric compensation
Solution
Turn speech enhancement filter on
Instruct user/reduce speaking distance
Turn phantom power on
Increase input level/reduce speaking
distance
Use valid microphone or connect a
microphone mixer (amplifier)
Exchange faulty part
Set DIL switch to correct position
Turn speech enhancement filter off
Set Parametric MLC to correct level
Use smaller/multiple loops
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