Product Overview
The SM137 is a versatile, flat-response cardioid condenser probe microphone. This professional cardioid instrument condenser microphone offers natural sound reproduction in both acoustic and high volume performance applications. Features include a thin diaphragm, a Class-A preamplifier, pad for performance consistency, and low self-noise. 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.
Includes
- SM137 Condenser Microphone
- Swivel Adapter
- Zippered Pouch
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)
Specifications
- Type: Electret Condenser
- Frequency Response: 20 to 20,000 Hz
- Polar Pattern: Cardioid
- Output Impedance: 150 Ω (actual)
- Sensitivity (at 1 kHz, open circuit voltage): -41 dBV/Pa[1]
- Maximum SPL, (1 kHz at 1% THD)
- 1000 Ω load: 139 dB (154 dB, PAD ON)
- 2500 Ω load: 144 dB (159 dB, PAD ON)
- Signal-To-Noise Ratio (Ref. 94 dB SPL at 1 kHz): 75 dB[2]
- Dynamic Range (at 1 kHz)
- 1000 Ω load 120 dB
- 2500 Ω load 125 dB
- Common Mode Rejection (10 Hz to 100 kHz): >50 dB
- Clipping Level (20 Hz to 20 kHz, at 1% THD[3])
- 1000 Ω load 3 dBV
- 2500 Ω load 9 dBV
- Self Noise (typical, equivalent SPL, A-weighted): 19 dB
- Attenuator Switch: -15 dB
- Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
- Net Weight: 195 g (6.9oz.)
- Connector: Three-pin professional audio (XLR), male
- Power Requirements: 48 V DC phantom power, 5.2 mA