Shure SM137 Leaflet

SM137

Type

Electret Condenser

Frequency Response

20 to 20,000 Hz

Polar Pattern

Cardioid

Impedance

150 Ω (actual)

Sensitivity

(at 1 kHz, open circuit voltage)

−41 dBV/Pa

1 Pascal=94 dB SPL

Maximum SPL

(1 kHz, < 1% THD)

1000 Ω load: 139 dB (154 dB, Pad on)

2500 Ω 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 Ω load: 122 dB

2500 Ω load: 128 dB

Common Mode Rejection

(20 Hz to 20 kHz)

> 50 dB

Clipping Level

(20Hz-20 kHz at 1% THD)

1000 Ω load: 3 dBV

2500 Ω 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

©2008 Shure Incorporated

The SM137 is a versatile, flat-response cardioid condenser probe microphone with 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

Cardioid polar pattern to reduce the pickup of unwanted sounds

•

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 har-

•

monic 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 (SPLs)

•

Polar Pattern

Frequency Response

Includes a Swivel Adapter and a Zippered Pouch

Shock Stopper™ Isolation Mount

Isolation Mount