Shure : SM137
Description
The Shure SM Microphones Series
SM-137 is a versatile, flat-response cardioid condenser probe microphone.
The SM 137 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, 2.5 µm 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 levelsSpecifications
| Type | Electret Condenser |
| Frequency Response | 20 to 20,000 Hz |
| Polar Pattern | Cardioid |
| Impedance | 150 O (actual) |
| Sensitivity (at 1 kHz, open circuit voltage) | -41 dBV/Pa; 1 Pascal=94 dB SPL |
| Maximum SPL (1 kHz, < 1% THD) | 1000 O load: 139 dB (154 dB, Pad on); 2500 O 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 O load: 122 dB; 2500 O load: 128 dB |
| Common Mode Rejection (20 Hz to 20 kHz) | > 50 dB |
| Clipping Level (20Hz-20 kHz at 1% THD) | 1000 O load= 3 dBV; 2500 O 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 (8.9 oz.) |
| Switch | Attenuator= -15 dB |
| Dimensions | 162 mm (6.375 in.) L x 24 mm (0.950 in.) |
| Connector | Three-pin professional audio (XLR), male |
| Power Requirements | 48 Vdc phantom, 5.2 mA polar pattern to reduce the pickup of unwanted sounds |