SHURE SM137-LC Condenser Instrument Microphone
The SM137 is a versatile, flat-response cardioid condenser probe microphone with 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 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
Specs
- 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
- 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
