The SM137 probe microphone is designed 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

MPN: SM137-LC

- 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
- Cartridge Type - Permanently Biased Condenser
- Frequency Response - 20­ to 20,000 Hz
- Directional Polar Pattern - Cardioid
- Output Impedance - 150 ohms (actual)
- Phantom Power - 48 Vdc +/- 4 Vdc (IEC­268­15/DIN 45 596), positive pins 2 and 3
- Positive pressure on diaphragm produces positive voltage on output pin 2 relative to pin 3