Connecting the headset, turning on the battery pack

￿Connect the XLR-3 plug of the headset connecting cable to the XLR-3 socket on the connecting cable of the battery pack.

￿HMEC 300 and HMEC 400 headsets: Connect the 1/4” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the corresponding jack sockets of your intercom.

HMEC 305-C headset: Connect the XLR-5 plug for the headphones and the microphone to the aircraft’s XLR-5 socket.

HMEC 322 and HMDC 322 headsets: Connect the U-174/U jack plug for the headphones and the microphone to the U-174/U socket of your intercom.

￿Turn on the battery pack by setting the ON/OFF switch to ON. The green LED power indicator lights up.

Note:

When using the battery pack, the ON/OFF switch integrated into the headset connecting cable is out of operation.

Attaching the battery pack to clothing

The battery pack can be attached to clothing by means of the supplied attachment clip, Velcro tape is also supplied.

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Sennheiser HD400 manual Connecting the headset, turning on the battery pack, Attaching the battery pack to clothing, 126
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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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