
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.
Features:
- Cardioid polar pattern to reduce the pickup of unwanted sounds
- Ultra-thin, 2.5 micron 24 karat gold-layered, low mass Mylar® diaphragm for superior transient response
- Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion, and minimal harmonic and intermodulation distortion
- Premium electronic components, including gold-plated internal and external connectors
- Two-position switchable pad (0 dB and 15 dB) for handling extremely high sound pressure levels (SPLs)
Type | Electret Condenser |
Frequency Response | 20 to 20,000 Hz |
Polar Pattern | Cardioid |
Output Impedance | 150 ohms actual |
Sensitivity (at 1 kHz, open circuit voltage) | -41 dBV/Pa (1 Pascal=94 dB SPL) |
Maximum SPL (1 kHz at 1% THD) | 1000 ohms load: 139 dB (154 dB, Pad on) / 2500 ohms load: 144 dB (159 dB, Pad on) |
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) |
Dynamic Range (at 1 kHz) | 1000 ohms load: 122 dB / 2500 ohms load: 128 dB |
Common Mode Rejection (20 Hz to 20 kHz) | > 50 dB |
Clipping Level (20Hz-20 kHz at 1%THD) | 1000 ohms load: 3 dBV / 2500 ohms load: 9 dBV (THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL) |
Self Noise (typical, equivalent SPL, A-weighted) | 19 dB |
Polarity | Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 |
Weight | Net: 195 g (6.9 oz.) |
Switch | Attenuator: -15 dB |
Connector | Three-pin professional audio (XLR), male |
Power Requirements | 48 Vdc phantom, 5.2 mA |
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.
Features:
- Cardioid polar pattern to reduce the pickup of unwanted sounds
- Ultra-thin, 2.5 micron 24 karat gold-layered, low mass Mylar® diaphragm for superior transient response
- Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion, and minimal harmonic and intermodulation distortion
- Premium electronic components, including gold-plated internal and external connectors
- Two-position switchable pad (0 dB and 15 dB) for handling extremely high sound pressure levels (SPLs)
Type | Electret Condenser |
Frequency Response | 20 to 20,000 Hz |
Polar Pattern | Cardioid |
Output Impedance | 150 ohms actual |
Sensitivity (at 1 kHz, open circuit voltage) | -41 dBV/Pa (1 Pascal=94 dB SPL) |
Maximum SPL (1 kHz at 1% THD) | 1000 ohms load: 139 dB (154 dB, Pad on) / 2500 ohms load: 144 dB (159 dB, Pad on) |
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) |
Dynamic Range (at 1 kHz) | 1000 ohms load: 122 dB / 2500 ohms load: 128 dB |
Common Mode Rejection (20 Hz to 20 kHz) | > 50 dB |
Clipping Level (20Hz-20 kHz at 1%THD) | 1000 ohms load: 3 dBV / 2500 ohms load: 9 dBV (THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL) |
Self Noise (typical, equivalent SPL, A-weighted) | 19 dB |
Polarity | Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 |
Weight | Net: 195 g (6.9 oz.) |
Switch | Attenuator: -15 dB |
Connector | Three-pin professional audio (XLR), male |
Power Requirements | 48 Vdc phantom, 5.2 mA |
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