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Product Specifications
SM137 Includes a Swivel Adapter and a Zippered Pouch
SM137 Cardioid Condenser Microphone
Overview
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
• Cardioid 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 (SPLs)
Available Models
Specifications
Type Electret Condenser
Frequency Response 20 to 20,000 Hz
Polar Pattern Cardioid
Impedance 150 Ω (actual)
Sensitivity
(at 1 kHz, open circuit voltage)
Maximum SPL
(1 kHz, < 1% THD)
Signal-to-Noise Ratio
(referenced at 94 dB SPL at 1 kHz)
Dynamic Range
(at 1 kHz)
Common Mode Rejection
(20 Hz to 20 kHz)
Clipping Level
(20Hz-20 kHz at 1% THD)
Self Noise
(typical, equivalent SPL, A-weighted)
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
−41 dBV/Pa
1 Pascal=94 dB SPL
1000 Ω load: 139 dB (154 dB, Pad on)
2500 Ω load: 144 dB (159 dB, Pad on)
75 dB
S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
1000 Ω load: 122 dB
2500 Ω load: 128 dB
> 50 dB
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
19 dB
SM137
Optional Accessories and Replacement Parts
Shock Stopper™ Isolation Mount Isolation Mount
Polar pattern
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Frequency response