Problem

Clear communication but no active noise compensation

In case of difficulty

If problems occur that are not listed in the below table, please contact your Sennheiser agent.

Possible cause and what to do

The NoiseGard™ electronics are turned off.

￿Check to see if the ON/OFF switch is set to ON.

The XLR-3 plug has been pulled out of the power source.

￿Check to see if the XLR-3 plug is correctly connected to the power source.

If aircraft powered: The aircraft fuse is defective.

￿Check the aircraft fuse.

If battery powered (except HMEC 302, HMEC 305 and HMEC 306): The batteries are low.

￿Check to see if the green LED on the battery pack is lit. If the red LED is lit, replace the batteries.

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Sennheiser HD400 manual Case of difficulty, Problem, Possible cause and what to do, 136
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HD400 specifications

The Sennheiser HD400 series represents a thoughtful blend of innovation, comfort, and superior audio quality, catering to both casual listeners and audiophiles alike. Renowned for their commitment to sound excellence, Sennheiser has integrated advanced technologies into the HD400 headphones, ensuring an immersive listening experience.

One of the standout features of the HD400 series is its exceptional sound quality, achieved through high-quality transducers that deliver a balanced and detailed audio spectrum. Whether listening to classical music or modern pop, users can expect clear highs, robust mids, and deep bass. This well-rounded sound signature makes the HD400 versatile for various genres and audio applications.

Comfort is paramount in the design of the HD400. The headphones feature plush ear pads and an adjustable headband, allowing users to enjoy long listening sessions without discomfort. The lightweight design further enhances usability, making these headphones perfect for both at-home listening and on-the-go use. Additionally, the ergonomic design ensures a secure fit, reducing sound leakage and providing an immersive experience.

Equipped with advanced connectivity options, the HD400 series primarily supports wired connections, ensuring minimal audio latency and maximum sound fidelity. This wired setup is complemented by a high-quality audio cable that provides flexibility and durability, crucial for everyday wear.

Sennheiser is known for its noise isolation technology, which is prominently featured in the HD400 series. This technology effectively blocks out ambient noise, allowing listeners to delve deep into their audio without distractions. This feature is particularly useful in crowded environments or during commutes.

Durability is another characteristic of the HD400 series. Constructed with high-quality materials, these headphones are designed to withstand daily use while maintaining their aesthetic appeal. Sennheiser also offers a limited warranty, underscoring their confidence in the product's longevity.

Overall, the Sennheiser HD400 series harmonizes comfort, sound quality, and innovative technology, making it an ideal choice for anyone seeking an elevated audio experience. With their thoughtful design and performance, they appeal to a broad audience, whether for casual listening or professional audio applications. The Sennheiser HD400 stands as a testament to the brand's commitment to audio excellence.
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