Sennheiser HMD 25-1

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Sennheiser HMD 25-1

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The HMD 25-1 headset features dynamic, closed headphones giving excellent attenuation of background noise and an MD 414 super-cardioid close contact dynamic microphone. It has been designed specifically for use in noisy environments.

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Specs:

Headset

  • Transducer Principle: Dynamic
  • Ear coupling: supra-aural, closed
  • Frequency response: 20–16,000 Hz
  • Characteristic SPL: 102 dB ± 2 dB at 1 kHz, 1 mW
  • Nominal impedance: 600 Ω per side
  • Load rating: 200 mW
  • THD: < 1 %
  • Weight (without cable): approx. 6.7 oz

Microphone

  • Transducer principle: dynamic
  • Frequency response: 100–16,000 Hz
  • Polar pattern: super-cardioid
  • Sensitivity (free field, no load) (1 kHz): 1 mV/Pa
  • Min. terminating impedance: 1 kΩ
  • Connections: cable 1.8 m, steel cable, tin-plated open ends