Specification Sheet

SM137 Cardioid Condenser Microphone
SM137
Type Electret 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
Product Specifications
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Overview
Features
Specifications
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
• 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 har-
monic 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)
Polar pattern
Frequency response
Available Models
Optional Accessories and Replacement Parts
SM137 Includes a Swivel Adapter and a Zippered Pouch
Shock Stopper™ Isolation Mount Isolation Mount