Shure KSM137 - Manual (Page 7)

6
SPECIFICATIONS
Cartridge Type Permanently Biased Condenser
Frequency Response 20–20,000 Hz (see Figure 3)
Directional Polar Pattern Cardioid (see Figure 4)
Output Impedance 150 Ω (actual)
Attenuation Switch 0 dB,15 dB, or 25 dB attenuation
Low Frequency Response Switch Flat; –6 db/octave below 115 Hz;
–18 dB/octave below 80 Hz
Phantom Power 48 Vdc ± 4 Vdc (IEC–268–15/DIN 45 596),
positive pins 2 and 3
Current Drain 4.65 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 20 mm (0.8 in.) diameter, 122 mm (4.8 in.) long;
100 grams (3.5 oz.) (see Figure 5)
Sensitivity (typical, at 1000 Hz;
1 Pa = 94 dB SPL)
–37 dBV/Pa
Self–noise (typical, equivalent SPL;
A-weighted, IEC 651)
14 dB
Maximum SPL at 1 kHz
5000
Ω
load (Attenuator on)
2500 Ω load (Attenuator on)
1000 Ω load (Attenuator on)
145 (160, 170) dB
139 (154, 164) dB
134 (149, 159) dB
Output Clipping Level*
5000 Ω load
2500 Ω load
1000 Ω load
15 dBV
9 dBV
3 dBV
Dynamic Range
5000 Ω load
2500 Ω load
1000 Ω load
131 dB
125 dB
120 dB
Signal to Noise Ratio** 80 dB
*20 Hz to 20 kHz; THD < 1%. THD of the microphone preamplifier when applied input signal is equivalent to the cartridge
output at specified SPL
**S/N ratio is difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.