Shure KSM9 Guide De L'utilisateur page 7

Impedance
A minimum load impedance of 800 ohms should be used for maximum signal
handling and minimum distortion. The impedance may be as low as 150 ohms,
but a reduction in output level and output clipping level will result.
SPECIFICATIONS
Cartridge Type
Frequency Response
Output Impedance
Phantom Power
Current Drain
Common Mode Rejection
Polarity
Directional Polar Patterns
Sensitivity
(typical; at 1000 Hz;
1 Pa = 94 dB SPL)
Self-noise
(typical, equivalent SPL;
A-weighted, IEC 651)
Maximum SPL @ 1000 Hz
2500 Ω load
1000 Ω load
Output Clipping Level*
2500 Ω load
1000 Ω load
Dynamic Range
2500 Ω load
1000 Ω load
Signal to Noise ratio**
Dimensions and Weight
*100 Hz to 20 kHz;THD < 1%.
**S/N ratio is difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.
Condenser (Electret Biased)
48 Vdc ± 4 Vdc (IEC-268-15/DIN 45 596), positive pins
5.2 mA typical at 48 Vdc
>60 dB, 50 Hz to 20 kHz
Positive pressure on front diaphragm produces
positive voltage on output pin 2 relative to pin 3
Cardioid
(See Figure 3)
49 mm (1 15/16 in.) maximum body diameter, 191 mm
(7.5 in.) long; 300 grams (10.6 oz). See Figure 6.
5
50 to 20,000 Hz
(See Figures 2, 4)
150 Ω (actual)
2 and 3
Supercardioid
(See Figure 5)
-51 dBV/Pa
22 dB
152 dB
152 dB
6.7 dBV
6.0 dBV
130 dB
130 dB
72 dB