Shure KSM137 manual Specifications, Attenuation Switch

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;	–37 dBV/Pa
1 Pa = 94 dB SPL)
Self–noise (typical, equivalent SPL;	14 dB
A-weighted, IEC 651)
Maximum SPL at 1 kHz	145 (160, 170) dB
5000 Ω load (Attenuator on)
2500 Ω load (Attenuator on)	139 (154, 164) dB
1000 Ω load (Attenuator on)	134 (149, 159) dB
Output Clipping Level*	15 dBV
5000 Ω load
2500 Ω load	9 dBV
1000 Ω load	3 dBV
Dynamic Range	131 dB
5000 Ω load
2500 Ω load	125 dB
1000 Ω load	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.

6