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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Shure KSM9 manual Impedance, Specifications