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USING THE KSM109
Mounting the Microphone
To secure the KSM109 to a floor stand or boom, thread the mount onto the
microphone stand and insert the microphone into the mount.
Power Requirements
The KSM109 requires phantom power and performs best with a 48 Vdc supply
(IEC-268-15/DIN 45 596). It can operate on voltages as low as 11 Vdc, but headroom
and sensitivity will be decreased slightly.
Note: Most modern mixers provide phantom power.
Cable Connections
Use a cable with XLR connectors at each end.
Load Impedance
Shure recommends a load impedance of at least 1000 Ω. When used with modern
microphone preamplifiers rated at about 2500 Ω, the KSM109 provides higher
maximum SPL capability and output clipping level. When the attenuation switch is
set to the –15 dB position, the KSM109 can handle up to 165 dB SPL, and can
output +15 dBV into a load of 5000 Ω or greater.
Setting Attenuation
The attenuation switch on the KSM109 lets you reduce the signal level by up to 15
dB without altering frequency response. This can prevent extremely loud sounds
from overloading the microphone. Set the switch to the desired attenuation levels
as follows:
0 dB – Move the switch to this position for “quiet” to “normal” sound levels.
-15 dB – Move the switch to this position when the microphone is approximately
0.75 meters (2 feet) from sound sources such as a snare drum, or electric guitar
cabinet.