General Description

The Shure® SM137 is a versatile, flat-response cardioid probe microphone with an ultra-thin diaphragm. Its frequency response combines smooth high-end and tight, controlled low-end. A 15 dB pad provides natural, consistent sound reproduction in both acoustic and high-volume performance applications.


Performance Characteristics

  • Extremely uniform polar response
  • Extended frequency response
  • Minimal self-noise
  • Exceptional low-frequency reproduction
  • Able to withstand high SPLs
  • High output level
  • No crossover distortion
  • Superior common-mode rejection and suppression of radio frequency interference (RFI)


  • Brass and woodwind instruments
  • Orchestras, choirs, and wind ensembles
  • Overhead miking of drums and percussion instruments
  • Close-miking of acoustic instruments such as piano, guitar, violins, drums, and percussion
  • Low-frequency instruments such as double bass and kick drum
  • Electric guitar and bass amplifiers
  • Vocals and speech
  • Room ambience
  • Note: Sound quality is strongly affected by microphone location and room acoustics. To achieve the best overall sound for a particular application, it may be necessary to experiment with microphone placement and room treatments.

Mounting the Microphone

Use the supplied microphone mount with floor or boom stands. Visit for more mounting options:

  • To reduce the pickup of unwanted low-frequency mechanical vibrations, use an isolating shock mount.
  • For stereo applications, use the optional Shure A27M Stereo Microphone Adapter.

Setting Attenuation

The attenuation switch lets you reduce the signal level without altering the frequency response. This can prevent extremely loud sounds from overloading the microphone.

0 dB For “quiet” to “normal” sound levels.
-15 dB For use with extremely loud sound sources such as drums, horns, or loud guitar cabinets.

Integral Pop Filter

The microphone grille consists of 3 separate mesh layers that act as an integral pop filter. This helps reduce wind and breath noise. Depending on the performer, an external pop-protection screen or windscreen may be necessary when close-miking vocalists.

Load Impedance

Maximum SPL capability, output clipping level, and dynamic range vary with the input load impedance of the preamplifier to which you connect the microphone. Shure recommends a minimum input load impedance of 1000 Ω. Most modern microphone preamplifiers meet this requirement. Higher impedance results in better performance for these specifications.

Power Requirements

This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc.

Most modern mixers provide phantom power. You must use a balanced microphone cable: XLR-to-XLR or XLR-to-TRS.



Electret Condenser

Frequency Response

20 to 20,000 Hz

Polar Pattern


Output Impedance

150 Ω (actual)


(at 1 kHz, open circuit voltage)

-41 dBV/Pa [1]

Maximum SPL

(1 kHz at 1% THD)

1000 Ω load 139 dB (154  dB, PAD ON)
2500 Ω load 144 dB (159  dB, PAD ON)

Signal-To-Noise Ratio

(Ref. 94 dB SPL at 1 kHz)

75 dB [2]

Dynamic Range

(at 1 kHz)

1000 Ω load 120 dB
2500 Ω load 125 dB

Common Mode Rejection

(10 Hz to 100 kHz)

>50  dB

Clipping Level

(20 Hz to 20 kHz, at 1% THD [3])

1000 Ω load 3 dBV
2500 Ω load 9 dBV

Self Noise

(typical, equivalent SPL, A-weighted)

19 dB

Attenuator Switch

-15 dB


Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3

Net Weight

195 g (6.9oz.)


Three-pin professional audio (XLR), male

Power Requirements

48 V DC phantom power, 5.2  mA

Overall Dimensions

Typical Frequency Response

Typical Polar Patterns


Storage Case


Microphone Clip

Furnished Accessories

Storage Bag 95C2313
Black Foam Windscreen for PGA81, SM94 and SM137 A3WS
Microphone Clip for SM58, SM57, SM87A, BETA87A, BETA87C, PGA57, PGA58, PGA48, PGA81 A25D

Optional Accessories

Shock Stopper® Isolation Mount A55M
Shock Stopper Isolation Mount A55HM
Popper Stopper® Pop Filter with Metal Gooseneck and Microphone Stand Clamp PS-6


This product meets the Essential Requirements of all relevant European directives and is eligible for CE marking.

The CE Declaration of Conformity can be obtained from:

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: +49-7262-92 49 0

Fax: +49-7262-92 49 11 4