The rugged and durable SM31FH is a cardioid condenser microphone constructed with
hydrophobic materials that make it ideal for true performance in fitness instruction applications.
The moisture-repellent cartridge housing ensures a long product life by protecting the microphone
from the corrosion damage that causes typical fitness instruction headsets to fail.
Type: Electret Condenser
Frequency Response: 45 Hz to 20,000 Hz
Polar Pattern: Unidirectional (Cardioid)
Output Impedance @ 1 kHz: 600 Ω
Audio Output Level: -50.0 dBV/Pa
Signal-To-Noise Ratio @ 1 kHz: 66 dB
Maximum SPL (1000 Ω load, 1 kHz@ 3%THD): 145.0 dB
Dynamic Range @ 1 kHz, 1000 Ω load: 117.0 dB
Equivalent Output Noise (typical, A-Weighted): 28 dB
Power Requirements: +5 V DC (nominal), 10 V maximum (DC bias)
Polarity: Positive pressure on diaphragm produces positive voltage on pin 3 with respect to pin 1
Cable: 1.1 m (45 in.)
Net Weight: 60 g (2.11 oz.)
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