A versatile, flat-response mic for acoustic and high volume performance applications.

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.

Shure SM137 Condenser Instrument Microphone 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

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Shure SM137 Condenser Instrument Microphone Specifications:

• SM137 Condenser Microphone
• Cartridge Type: Permanently Biased Condenser
• Frequency Response: 20 to 20,000Hz
• Directional Polar Pattern: Cardioid
• Output Impedance: 150Ω (actual)
• Attenuation Switch (0dB or 15dB 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: >50dB, 20Hz to 20kHz
• Polarity: Positive pressure on diaphragm produces positive voltage on output pin 2 relative to pin 3
• Dimensions: 24mm (0.950") diameter, 162mm (6.375") long
• Weight: 195g (6.9oz..)
• Sensitivity (typical, at 1000Hz; 1 Pa = 94dB SPL): -41dBV/Pa
• Self-noise (typical, equivalent SPL; A-weighted (IEC 651)): 19dB
• Maximum SPL@ 1000Hz:
• 5000Ω load (Attenuator on): 150 (165dB)
• 2500Ω load (Attenuator on): 144 (159)dB
• 1000Ω load (Attenuator on): 139 (154dB)
• Output Clipping Level*:
• 5000Ω load: 15dBV
• 2500Ω load: 9dBV>
• 1000Ω load: 3dBV
• *20Hz to 20kHz; THD < 1%. THD of the microphone preamplifier when applied input signal is equivalent to the cartridge output at specified SPL.
• Dynamic Range (Attenuator On):
• 5000Ω load: 133 (136)dB
• 2500Ω load: 128 (130dB)
• 1000Ω load: 122 (125)dB
• Signal to Noise Ratio**
• 75dB
• **S/N ratio is difference between 94dB SPL and equivalent SPL of self-noise A-weighted