Shure KSM109

Cartridge Type Permanently Biased Condenser
Frequency Response 20-20,000 Hz (see Figure 2)
Directional Polar Pattern Cardioid (see Figure 3)
Output Impedance 150 Ω (actual)
Attenuation Switch 0 dB or 15 dB attenuation
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 ≥ 50 dB, 20 Hz to 20 kHz
Polarity Positive pressure on diaphragm produces positive voltage on output pin 2 relative to pin 3
Dimensions and Weight 24 mm diameter, 162 mm long; 195 grams
Sensitivity (typical, at 1000 Hz 1 Pa = 94 dB SPL); -41 dBV/Pa
Self-noise (typical, equivalent SPL; 19 dB
Maximum SPL (Attenuator on):

• 5000 Ω load   150 (165) dB
• 2500 Ω load   144 (159) dB
• 1000 Ω load   139 (154) dB

Output Clipping Level:

• 5000 Ω load   15 dBV
• 2500 Ω load   9 dBV
• 1000 Ω load   3 dBV

Dynamic Range (Attenuator on):

• 5000 Ω load   133 (136) dB
• 2500 Ω load   128 (130) dB
• 1000 Ω load   122 (125) dB

Signal to Noise Ratio: 75 dB