Shure SM137 Cardioid Condenser Microphone

→ 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
→ 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 levels