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Setting Attenuation
The attenuation switch on the back of the KSM32 reduces the signal level
from the cartridge by 15 dB without altering the frequency response. This can
prevent extremely high SPL from overloading the microphone. To activate atte-
nuation, move the switch to the “–15 dB” position.
In situations where the high output capability of the KSM32 might overload
the microphone preamplifier of a console or mixer, use an attenuation switch
(pad) in the mixer or an external inline attenuator such as the Shure A15AS.
Load Impedance
A load impedance of at least 1000 Ω is recommended. When used with typi-
cal modern microphone preamplifiers (rated at about 2500 Ω), the KSM32 pro-
vides higher maximum SPL capability and output clipping level. The KSM32
can handle up to 160 dB SPL, and output +15 dBV into a 5500 Ω or greater load
with microphone attenuation.
SPECIFICATIONS
Cartridge Type
Permanently-biased condenser
Frequency Response
20 Hz to 20 kHz (see Figure 1)
Directional Pattern
Cardioid (see Figure 2)
Sensitivity (at 1000 Hz)
Open Circuit Voltage –36 dBV/Pa (16 mV) typical. . . . . . . . . . . . . . . . . . . . . . . . .
(1 Pa = 94 dB SPL)
Self Noise (equivalent SPL)
13 dB typical, A-weighted (IEC 651)
Total Harmonic Distortion (20 Hz to 20 kHz , 2500 Ω load)
< 0.08%* for a 120 dB equivalent SPL input
Maximum SPL (20 Hz to 20 kHz, THD < 1%*)
2500 Ω Load 139 dB (154 dB w/ attenuation). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1000 Ω Load 133 dB (148 dB w/ attenuation). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Clipping Level (20 Hz to 20 kHz, THD < 1%*)
2500 Ω Load +9 dBV (2.82 V rms). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1000 Ω Load +3 dBV (1.41 V rms). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dynamic Range (20 Hz to 20 kHz, 2500 Ω load)
126 dB (maximum SPL minus A-weighted noise level)
Signal-to-Noise Ratio
81 dB (IEC 651)**
Output Impedance
150 Ω (actual)
Attenuation Switch
0 or –15 dB