Shure SM137 Small Diaphragm Cardioid Condenser Microphone

Shure SM137 Small Diaphragm Cardioid Condenser Microphone

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Product Description

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

The SM137 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 diaphragm for smooth high end and tight, controlled low end

  • 15dB pad for performance consistency across a wider range of high SPL sources

  • Low self-noise and transformerless preamplifier circuitry

Cartridge Type

Permanently Biased Condenser

Frequency Response

20 to 20,000 Hz

Directional Polar Pattern


Output Impedance

150 ohms (actual)

Attenuation Switch
0 dB or 15 dB attenuation
Phantom Power

48 Vdc +/- 4 Vdc

(IEC-268-15/DIN 45 596), positive pins 2 and 3

Current Drain

5.2 mA typical at 48 Vdc

Common Mode Rejection

>50 dB, 20 Hz to 20 kHz


Positive pressure on diaphragm produces positive voltage on output pin 2 relative to pin 3

Dimensions and Weight

24 mm (0.950 in.) diameter

162 mm (6.375 in.) long

195 grams (6.9 oz.)

Sensitivity (typical, at 1000 Hz; 1 Pa = 94 dB SPL)

-41 dBV/Pa

Self-noise (typical, equivalent SPL; A-weighted (IEC 651))

19 dB

Maximum SPL@ 1000 Hz

5000 ohms load (Attenuator on): 150 (165 dB)

2500 ohms load (Attenuator on): 144 (159) dB

1000 ohms load (Attenuator on): 139 (154 dB)

Output Clipping Level*

5000 ohms load: 15 dBV

2500 ohms load: 9 dBV>

1000 ohms load: 3 dBV

*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.

Dynamic Range (Attenuator On)

5000 ohms load: 133 (136) dB

2500 ohms load: 128 (130 dB)

1000 ohms load: 122 (125) dB

Signal to Noise Ratio**

75 dB

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

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