Shure SM137 Microphone

The Shure 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.

Features

• 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

Recommended Uses

• Studio Ensemble
• Studio Instrument
• Orchestra/Strings
• Woodwinds
• Acoustic Guitar
• Acoustic Bass
• Guitar Amp
• Piano/Organ
• Cymbols
• Percussion
• Stage Overhead

Shure SM137 Microphone User Guide (PDF)

Cartridge Type

• Permanently Biased Condenser

Frequency Response

• 20 to 20,000 Hz

Directional Polar Pattern

• Cardioid

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

Polarity

• 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.