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Setting Attenuation
The attenuation switch on the back of the KSM27 reduces the signal level from the
cartridge by 15 dB without altering the frequency response. This can prevent
extremely high SPLs (ie. close miked drums and guitar cabinets) from overloading
the microphone. To activate attenuation, move the switch to the “-15 dB” position.
0 dB – Use this switch for “quiet” to “normal” sound levels.
-15 dB – Use this switch position when in close proximity with extremely loud
sound sources such as kick drum, snare drum, or loud guitar cabinets.
Integral Pop Filter
The KSM27 grille consists of 3 separate mesh layers that act as an integral pop filter
which helps reduce wind and breath noise. Depending on the performer, an external
pop-protection screen or windscreen (See Figure 3) may be necessary when
close-miking vocalists.
FIGURE 3. PS–6 POPPER STOPPER
T
POP FILTER
Load Impedance
Shure recommends a load impedance of at least 1000 Ω. When used with modern
microphone preamplifiers (rated at 2500 Ω), the KSM27 provides higher maximum
SPL capability and output clipping level. When the attenuation switch is set to the
–15 dB position, the KSM27 can handle sound pressure levels of up to 152 dB and
output +15 dBV into a load of 2500 Ω or greater.