Shure SM137 Specification Sheet

Product Speciﬁcations

SM137 Includes a Swivel Adapter and a Zippered Pouch

SM137 Cardioid Condenser Microphone

Overview

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

Features

• 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 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 (SPLs)

Available Models

Specifications

Type Electret Condenser

Frequency Response 20 to 20,000 Hz

Polar Pattern Cardioid

Impedance 150 Ω (actual)

Sensitivity

(at 1 kHz, open circuit voltage)

Maximum SPL

(1 kHz, < 1% THD)

Signal-to-Noise Ratio

(referenced at 94 dB SPL at 1 kHz)

Dynamic Range

(at 1 kHz)

Common Mode Rejection

(20 Hz to 20 kHz)

Clipping Level

(20Hz-20 kHz at 1% THD)

Self Noise

(typical, equivalent SPL, A-weighted)

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

−41 dBV/Pa 1 Pascal=94 dB SPL

1000 Ω load: 139 dB (154 dB, Pad on) 2500 Ω load: 144 dB (159 dB, Pad on)

75 dB S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted

1000 Ω load: 122 dB 2500 Ω load: 128 dB

> 50 dB

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

19 dB

SM137

Optional Accessories and Replacement Parts

Shock Stopper™ Isolation Mount Isolation Mount

Polar pattern

Frequency response