David Clark H9941 Wireless Neckband, Behind-the-Head Single Ear Headset - 40991G-02

The David Clark H9941 (40991G-02) Wireless Headset Microphone is a single ear, behind the head communication headset designed for the Series 9900 Wireless Intercom System and David Clark wireless belt stations. Built with marine grade corrosion resistant hardware and a durable noise cancelling dynamic microphone, it supports reliable wireless intercom communications in high noise work zones. This configuration includes a slotted dome on the non earphone side to help users maintain awareness of ambient sounds, making it useful for aviation ground support teams, ramp supervisors, and maintenance crews that need mobility and situational awareness while staying connected. It is also widely used in marine and fire rescue operations where rugged wireless communications are required.

• Wireless headset designed to interface with Series 9900 wireless belt station systems.
• Single ear design supports awareness of ambient sound while maintaining intercom communications.
• Designed for high noise environments up to 125 dB with a noise cancelling dynamic microphone.
• Marine grade construction supports harsh weather and corrosion prone environments.

Key Features

• M2 dynamic microphone with water resistant protection and strong noise cancellation.
• Hybrid hinged wire and flex microphone boom for precise placement.
• One titanium nitride driver earphone with stainless steel retainer, plus one slotted dome with no earphone to allow hearing ambient sounds.
• Water tight volume control for variable gain setting.
• 6 ft extended coiled cord with military grade 7 pin belt station connector (MAP-57-50).
• Comfort gel ear seal on the earphone side and an overhead support assembly with adjustable fit.
• Reversible hardware and a rotational boom provide left or right microphone positioning options.

H9941 (40991G-02) Specifications

• Weight: 14.7 oz (417 g)
• Communication Cord: 6 ft coil with MAP-57-50 connector
• Certified NRR: N/A (single ear headset)
• Ear Impedance: 35 ohm plus or minus 10 percent at 1 kHz
• Ear Frequency Response: 20 Hz to 20 kHz
• Microphone Principle: Dynamic
• Microphone Impedance: 5 ohm nominal
• Microphone Frequency Response: 150 Hz to 8 kHz

For wireless ramp and ground support communications where mobility and awareness matter, the David Clark H9941 (40991G-02) offers a rugged single ear headset solution built to perform in demanding aviation and industrial environments.