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
- 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
Specifications
- Type Electric Condenser
- Frequency Response 20 to 20,000 Hz
- Polar Pattern Cardioid
- Impedance 150 Ω (actual)
- Sensitivity
(at 1 kHz, open circuit voltage) - −41 dBV/Pa
1 Pascal=94 dB SPL - Maximum SPL
(1 kHz, < 1% THD) - 1000 Ω load: 139 dB (154 dB, Pad on)
- 2500 Ω 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 Ω load: 122 dB
- 2500 Ω load: 128 dB
- Common Mode Rejection (20 Hz to 20 kHz): > 50 dB
- Clipping Level
(20Hz-20 kHz at 1% THD) - 1000 Ω load: 3 dBV
- 2500 Ω 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
