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The Shure SM137 is a versatile, flat-response cardioid condenser instrument microphone with an ultra-thin diaphragm for a frequency response that combines a smooth high-end with a tight, controlled low-end. It boasts 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
Type
Electret Condenser
Frequency Response
20–20000 Hz
Polar Pattern
Cardioid
Sensitivity (at 1 kHz , open circuit voltage)
−41 dBV/Pa
1 Pascal=94 dB SPL
Impedance
150 Ω
Dynamic Range
1000 Ω load: 122 dB
2500 Ω load: 128 dB
Common Mode Rejection 20Hz -20 KHz
>50 dB
Maximum SPL
1000 Ω load: 139 dB
2500 Ω load: 144 dB
Clipping Level
(20Hz-20 kHz at 1% THD)
1000 Ω load: 3 dBV
2500 Ω load: 9 dBV
Self Noise
19 dB
Signal-to-Noise Ratio
(referenced at 94 dB SPL at 1 kHz)
75 dB
S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
Polarity
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight
Net 195 gr
Switch
Attenuator: −15 dB
Connector
Three-pin professional audio (XLR), male
Power Requirements
48 Vdc phantom, 5.2 mA
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