By: Shure
Microphones, Headphones & Wireless systems
Contact us for lowest price (800) 284-2288, (858) 565-1101,, or fax (858) 300-4193
Cardioid Condenser Microphone
The Shure SM Microphones Series SM-137 is a versatile, flat-response cardioid condenser probe microphone.

The SM 137 has an ultra-thin diaphragm for a frequency response that combines a smooth high-end with a tight, controlled low-end and a 15db pad for natural sound reproduction in both acoustic and high volume performance applications.
Ultra-thin, 2.5 µm 24 karat gold-layered, low mass Mylar diaphragm for superior transient response
Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion, and minimal harmonic and intermodulation distortion
Premium electronic components, including gold-plated internal and external connectors
Two-position switchable pad (0 dB and 15 dB) for handling extremely high sound pressure levels
Type Electret Condenser
Frequency Response 20 to 20,000 Hz
Polar Pattern Cardioid
Impedance 150 O (actual)
Sensitivity (at 1 kHz, open circuit voltage) -41 dBV/Pa; 1 Pascal=94 dB SPL
Maximum SPL (1 kHz, < 1% THD) 1000 O load: 139 dB (154 dB, Pad on); 2500 O load: 144 dB (159 dB, Pad on)
Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz) 75 dB; S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
Dynamic Range (at 1 kHz) 1000 O load: 122 dB; 2500 O load: 128 dB
Common Mode Rejection (20 Hz to 20 kHz) > 50 dB
Clipping Level (20Hz-20 kHz at 1% THD) 1000 O load= 3 dBV; 2500 O load= 9 dBV; THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
Self Noise (typical, equivalent SPL, A-weighted) 19 dB
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight Net= 195 g (8.9 oz.)
Switch Attenuator= -15 dB
Dimensions 162 mm (6.375 in.) L x 24 mm (0.950 in.)
Connector Three-pin professional audio (XLR), male
Power Requirements 48 Vdc phantom, 5.2 mA polar pattern to reduce the pickup of unwanted sounds

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Prices and specifications subject to change without notice.