From Shure
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
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.
Free 3-Year Warranty
In addition to the standard included manufacturer warranty, virtually all new products carry our exclusive, industry-leading, absolutely free Sound Pure 3-Year Warranty, which includes parts and labor. It's our way of adding real value to the personal touch our small, dedicated team brings to every purchase.
Coverage exclusions live in Terms & Conditions, Section 27. Read the warranty →
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