Sennheiser HMEC 305-C, HMEC 300, HMDC 322, HMEC 400, HMEC 322, HMEC 302 Headset Hmec 305-C, 124

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Headset HMEC 302:

￿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 headset:

￿Connect the XLR-5 plug to the aircraft’s XLR-5 socket.

Headset HMEC 305-C:

￿Connect the XLR-5 plug for the headphones and the microphone to the aircraft’s XLR-5 socket.

￿Connect the XLR-3 plug to the XLR-3 socket.

HMEC 306 headset:

￿Connect the 6-pin Redel plug to the corresponding socket in the aircraft.

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.

￿Connect the XLR-3 plug to the XLR-3 socket.

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Contents Headset 111Preparing the headsets for use 128 112Safety tips 113114 Headset featuresHmec 300 NoiseGard headset Hmec 305 NoiseGard headset Product variantsHmec 302 NoiseGard headset 115Hmec 322 NoiseGard headset Hmec 305-C NoiseGard headsetHmec 306 NoiseGard headset 116117 Hmec 400 NoiseGard headsetHmdc 322 NoiseGard headset 118 Hmec 302, Hmec 305 and Hmec 306 headsetsDelivery includes 119 Recommended accessoriesAdapter cables except for Hmec 302, Hmec 305 and Hmec Connecting the headsets Connecting cables for headsetsHmec 306 headset Hmec 322 and Hmdc 322 headsetsHmec 305-C headset 121Powering options 122Connecting the headset to the on-board system 123124 Headset HmecHeadset Hmec 305-C 125 LED operation and battery status indicationInserting / replacing the the batteries 126 Connecting the headset, turning on the battery packAttaching the battery pack to clothing Connecting the headset 127128 Preparing the headsets for useAdjusting the headband Positioning the microphone towards the corner of the mouth Positioning the microphoneRelocating the microphone boom 129130 131 Turning NoiseGard on/off Using the headsetsAdjusting the volume 132Attaching the cable clip Adjusting the microphone gainFolding up the headphones 133Replacing the ear cushions Spare partsReplacing the wind screen 134Replacing the headband padding 135Possible cause and what to do ProblemCase of difficulty 136137 138 Valuable information on NoiseGardNoiseGard principle 139 140 Connector assignment 141Microphone incl. preamplifier Technical dataHeadphones HmecHmec General data 143Hmec Hmec 305-C Hmdc 144Hmec Hmec 305-C Hmdc General data 145Certificate of Conformity 146
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HMEC 306, HMEC 305-C, HMEC 302, HMEC 305, HMEC 322 specifications

Sennheiser has long been recognized as a leader in audio technology, and its range of aviation headsets reflects this reputation. The HMEC 302, HMDC 322, HMEC 305-C, HMEC 300, and HMEC 322 models are designed for pilots and aviation professionals, combining advanced features, cutting-edge technology, and high-quality sound performance.

The HMEC 302 is renowned for its passive noise attenuation, which effectively blocks unwanted ambient noise while allowing clear communication. This model includes comfortable ear cushions and an adjustable headband, making it suitable for extended use. The lightweight design ensures minimal fatigue during long flights, and the sensitive microphone guarantees optimal voice transmission.

On the other hand, the HMDC 322 integrates active noise cancellation technology, providing an impressive level of sound isolation. This feature is especially valuable in noisy cockpit environments, where distractions can impact concentration. The headset also includes high-quality speakers that deliver crystal-clear audio whether for communication or entertainment, ensuring that pilots remain connected without compromising sound quality.

The HMEC 305-C is designed specifically for commercial pilots and features a robust, durable construction. This model is equipped with a high-performance microphone that offers excellent speech intelligibility, making it ideal for communication in loud environments. Additionally, the HMEC 305-C includes a flexible boom arm that allows precise positioning of the microphone for optimal voice clarity.

The HMEC 300 model focuses on delivering exceptional comfort and function. Its plush ear pads and lightweight materials create a snug fit that is ideal for long flights. This headset also offers a high level of sound isolation, making it perfect for pilots who regularly operate in high-noise environments.

Lastly, the HMEC 322 shares many characteristics with its counterparts. This headset is tailored for users seeking both comfort and superior sound quality. The advanced cushioning and adjustable features ensure that the headset remains comfortable during extended usage, while its robust materials are built to withstand the rigors of aviation use.

Overall, Sennheiser's HMEC series represents a blend of advanced technologies, comfort, and durability, making them essential tools for professionals in aviation. Whether through passive sound isolation, active noise cancellation, or exceptional voice clarity, these headsets cater to the demands of pilots who prioritize safety and performance in their communications.