Shure KSM9 manual Impedance, Specifications

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	Condenser (Electret Biased)
Frequency Response	50 to 20,000 Hz
	(See Figures 2, 4)
Output Impedance	150 Ω (actual)
Phantom Power	48 Vdc ± 4 Vdc (IEC-268-15/DIN 45 596), positive pins
		2 and 3
Current Drain	5.2 mA typical at 48 Vdc
Common Mode Rejection	>60 dB, 50 Hz to 20 kHz
Polarity	Positive pressure on front diaphragm produces
	positive voltage on output pin 2 relative to pin 3
Directional Polar Patterns	Cardioid		Supercardioid
	(See Figure 3)		(See Figure 5)
Sensitivity		-51 dBV/Pa
(typical; at 1000 Hz;
1 Pa = 94 dB SPL)
Self-noise		22 dB
(typical, equivalent SPL;
A-weighted, IEC 651)
Maximum SPL @ 1000 Hz		152 dB
2500 Ω load
1000 Ω load		152 dB
Output Clipping Level*		6.7 dBV
2500 Ω load
1000 Ω load		6.0 dBV
Dynamic Range		130 dB
2500 Ω load
1000 Ω load		130 dB
Signal to Noise ratio**		72 dB
Dimensions and Weight	49 mm (1 15/16 in.) maximum body diameter, 191 mm
	(7.5 in.) long; 300 grams (10.6 oz). See Figure 6.
*100 Hz to 20 kHz;THD < 1%.

**S/N ratio is difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.

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