The Problem of Noise

The negative effects of noise pollution have been proven by studies, and everybody will have experienced them at some time or another:

￿Nervousness

￿Lack of concentration

￿Irritability

And these are only the most obvious effects on the human body. Noise also affects the autonomic nervous system and can lead to permanent hearing damage.

There are a multitude of noise sources, and the individual very often has no influence over them. The only solution when being in a noisy place is protecting oneself against ambient noise. These noise problems are particularly prevalent in an aircraft cockpit where a pilot often has to have the communications headset so loud as to risk permanent hearing damage.

With the NoiseGardsystem, Sennheiser has come up with an effective solution. These operating instructions explain the NoiseGardprinciple and show you how to use the NoiseGardheadset.

Noise levels

 

140 dB

Jet engine (at a distance of 25 m)

loud

130 dB

Aircraft engine (This is the treshold of pain)

120 dB

Pneumatic drill

 

110 dB

Blacksmith's hammer, concrete works

 

100 dB

Die-cast machine

 

 

 

 

90 dB

Metal workshop

 

80 dB

Tractor

 

70 dB

Office

 

60 dB

Conversation

 

 

 

 

50 dB

Ambient noise

 

40 dB

Living room

quiet

30 dB

Library

20 dB

Bedroom

 

10 dB

Forest, no wind

The unit of sound levels is the decibel (dB). A noise reduction of 10 dB is generally perceived as a halving of the loudness, another 10 dB decrease halves the loudness yet again whitch corres- ponds to a loudness reduction of 75 %, and so on.

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Sennheiser HMEC 25-6A manual Loud, Quiet, Problem of Noise, Noise levels

HMEC 25-6A specifications

The Sennheiser HMEC 25-6A is a high-quality aviation headset designed specifically for pilots and air traffic controllers who demand superior performance and comfort. This headset is part of Sennheiser's long-standing tradition of excellence in audio equipment, combining advanced technology with rugged durability.

One of the standout features of the HMEC 25-6A is its noise-canceling capability. The headset uses high-quality dynamic microphones that provide excellent voice clarity while effectively eliminating background noise. This is especially critical in noisy environments such as cockpits or control towers, where clear communication is essential for safety and efficiency. The noise reduction technology ensures that pilots and controllers can communicate clearly, even in the loudest of conditions.

Comfort is another key aspect of the HMEC 25-6A. The headset is designed for extended wear, making it ideal for long flights or shifts. It features a lightweight design and plush ear cushions that provide a snug fit without causing discomfort over time. The adjustable headband ensures that users can find the perfect fit, which contributes to both comfort and effective sound isolation.

In terms of sound quality, the HMEC 25-6A excels with its high-fidelity audio reproduction. This feature enables precise sound monitoring, which is crucial for pilots when making critical flight decisions. The headset also comes equipped with a flexible boom microphone that can be adjusted for optimal positioning, ensuring clear transmission of instructions and communications.

The durability of the Sennheiser HMEC 25-6A is noteworthy as well. Constructed with high-quality materials, the headset is designed to withstand the rigors of aviation use. From its robust cables to its weather-resistant design, the HMEC 25-6A showcases Sennheiser's commitment to producing reliable products that last.

In addition to its impressive technical specifications, the HMEC 25-6A is also compatible with various aviation communication systems. This versatility allows it to be used in different aircraft types, providing flexibility for both professional and recreational pilots.

Overall, the Sennheiser HMEC 25-6A is a top-tier aviation headset that delivers exceptional sound quality, comfort, and durability. Its advanced noise-canceling technology, high-fidelity audio, and user-friendly design make it an excellent choice for those requiring a reliable communication tool in the aviation field. Whether for commercial pilots, flight schools, or aviation enthusiasts, the HMEC 25-6A is engineered to meet and exceed expectations in demanding environments.