Williams AV HED 040 – Hearing-Protector Dual Ear Muff Headphones

Product Overview

The Williams AV HED 040 is a hearing-protector dual ear muff headphone designed for use with FM and IR assistive listening receivers in high-noise environments. With a 24 dB Noise Reduction Rating (NRR) and a frequency response of 200 Hz to 6 kHz, the HED 040 provides both hearing protection and audio delivery for listeners in industrial, manufacturing, or high-ambient-noise venue settings. It is compatible with receivers that have stereo 3.5mm jacks and is recommended for use with PPA R37, PPA R38, and WIR RX 22-4 receivers.

Product Description

The HED 040 addresses a specific deployment requirement: delivering assistive listening audio to users who simultaneously need hearing protection from ambient noise. Standard headphones and earphones do not provide noise isolation adequate for environments such as manufacturing floors, outdoor event stages, shooting ranges, or loud industrial spaces. The dual ear muff design of the HED 040 provides 24 dB of noise reduction while maintaining audio fidelity across a 200 Hz to 6 kHz response range—sufficient for speech intelligibility applications. The 3.5mm stereo plug and 39" cord connect to compatible stereo-jack receivers including the Williams AV PPA R37 and PPA R38 FM receivers and the WIR RX 22-4 IR receiver. The 32Ω impedance is matched to these receiver outputs. At 0.85 lbs, the adult-size over-ear design is field-deployable. Note: the HED 040 is not compatible with the PPA R35-8 receiver. Replacement gel earpads (EAR 088) are available separately for hygiene management in shared-use deployments.

Key Features

• 24 dB Noise Reduction Rating — Provides certified hearing protection in high-noise environments while delivering assistive listening audio.
• Dual Ear Muff Design — Over-ear cup construction creates passive noise isolation for speech intelligibility in loud settings.
• 3.5mm Stereo Plug — Compatible with stereo-jack Williams AV FM and IR receivers including PPA R37, PPA R38, and WIR RX 22-4.
• 32Ω Impedance — Matched impedance for direct connection to compatible Williams AV receiver outputs.
• 200 Hz – 6 kHz Frequency Response — Optimized for speech-range audio reproduction in assistive listening applications.
• Adult Size — Adjustable over-ear design for adult users in field deployments.
• Replaceable Gel Earpads — EAR 088 replacement gel earpads sold separately for shared-use hygiene management.
• 39" Cord Length — Sufficient reach for typical body-worn receiver placement.

Typical Applications

• Manufacturing facility assistive listening with hearing protection
• Outdoor event or construction site ALS deployment
• Industrial environment FM assistive listening system
• High-ambient-noise venue hearing accommodation
• Shooting range or firearms training facility listening system
• Military or government facility ALS deployment in noisy spaces

Technical Specifications

Frequently Asked Questions

Which Williams AV receivers is the HED 040 compatible with?

The HED 040 is recommended for use with the PPA R37 and PPA R38 FM receivers and the WIR RX 22-4 IR receiver. It is compatible with any Williams AV receiver that has a stereo 3.5mm jack. It is not compatible with the PPA R35-8.

What is the Noise Reduction Rating of the HED 040?

The HED 040 has a Noise Reduction Rating (NRR) of 24 dB, providing meaningful hearing protection in moderate-to-high noise environments.

Can the earpads be replaced for hygiene purposes in shared deployments?

Yes — the EAR 088 replacement gel earpads are available separately and are recommended for shared-use hearing accommodation programs.

Does the HED 040 work with mono receivers?

No — the HED 040 uses a 3.5mm stereo plug and is compatible with receivers that have stereo jacks only.

What is the warranty on the HED 040?

Williams AV provides a 90-day warranty on the HED 040.

Is this suitable for ADA hearing accommodation programs?

Yes — the HED 040 is appropriate for ADA hearing accommodation deployments where ambient noise levels require passive hearing protection alongside audio delivery.