Sennheiser HDI 406

HDI 406

The HDI 406 (also written HDI406) is an infrared wireless headphone manufactured by the Sennheiser Corporation. This headphone operates in conjunction with the SI 406 transmitter, and has an integrated volume control and rechargeable battery. Here are some of its specifications and features.

  • Stethoset-type headphone
  • Frequency Response: 100 Hz to 10 kHz
  • Max SPL: 105 dB
  • Carrier frequency: 95 kHz
  • Mass: 65 g