HMEC25-KA:

Technische Daten

Wandlerprinzip

Übertragungsbereich Impedanz aktiv/passive

Klirrfaktor

Lärmdämpfung aktiv Frequenzbereich der aktiven Lärmdämpfung

Wandlerprinzip

Übertragungsbereich bei einem Abstand von 2 cm zum Mundwinkel

max. Schalldruckpegel Ausgangsspannung

Abschlußwiderstand Versorgungsspannung

Kopfhörer-Andruckkraft Gewicht ohne Kabel Kabel

Stecker

HMEC25-CA:

Stromversorgung

Betriebszeit

Anzeige:

NoiseGardHMEC 25-KA / -CA

Kopfhörer

dynamisch, geschlossen, ohraufliegend 16 Hz - 22 kHz

200 Ohm (mono) 400 Ohm pro Seite (stereo) Lautstärke aktiv und passiv gleich

< 1 %

15 dB + 3 dB im Bereich von 100 Hz - 2 kHz

50 - 600 Hz

Mikrofon incl. Vorverstärker

Back-Elektret-Kondensatorkapsel, geräuschkompensiert

300 Hz - 5 kHz entsprechend DO-214

120 dB (Klirrfaktor 1 %)

400 mV ± 3 dB bei 114 dB aus 6 mm Abstand (entsprechend DO-214)

150 Ohm

8 - 16 V DC, ca 8 - 25 mA, Beschaltung nach RTCA/DO 214

Allgemeine Daten

ca 2,5 N 170 g

einseitig, Länge gesamt: 1,8 m

Stereo-Klinke 6,3 mm, mono beschaltet PJ-068, 5,25 mm Mikrofon

XLR-5

2 x 1,5 V Mignon (AA) Alkali-Mangan Batterien (2700 mAh)

ca. 20 h

Zweifarben-LED zur Batteriekontrolle

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-CA, HMEC 25-KA manual Loud, Quiet

HMEC 25-KA, HMEC 25-CA specifications

The Sennheiser HMEC 25-CA is a professional-grade closed-back headset designed to deliver exceptional audio quality and comfort for users in various demanding environments, including aviation, broadcasting, and military applications. Renowned for its robust construction and advanced technology, this headset has become a trusted choice among professionals who require reliable communication and accurate audio reproduction.

One of the standout features of the HMEC 25-CA is its closed-back design, which provides excellent passive noise isolation. This characteristic is crucial for users in noisy environments, as it helps to minimize external sounds and allows for clear communication and focus on the task at hand. The comfortable ear cushions contribute to prolonged wearability, ensuring that users can remain engaged for extended periods without experiencing discomfort.

The headset is equipped with noise-canceling technology, allowing it to effectively suppress background noise while enhancing voice clarity. This feature is particularly beneficial in aviation and military scenarios where clear communication is critical. Whether communicating with a co-pilot or coordinating with team members, users can rely on the HMEC 25-CA to deliver crystal-clear audio.

Another important aspect of the HMEC 25-CA is its versatility. The headset is compatible with various communication systems, making it suitable for a wide range of applications. Additionally, its dual plug configuration ensures easy connectivity to different devices, enhancing its functionality across platforms.

The adjustable headband and rotating ear cups further improve the user experience, allowing for a personalized fit and optimal comfort. The durable construction of the headset also means it can withstand the rigors of professional use, ensuring longevity and reliability even in challenging environments.

In summary, the Sennheiser HMEC 25-CA is a top-tier headset that combines comfort, advanced noise-canceling capabilities, and versatile connectivity. Its robust design and high-quality audio performance make it a favorite among professionals who require dependable communication equipment. Whether used in aviation, broadcasting, or other critical fields, the HMEC 25-CA stands out as a reliable companion, ensuring that users can communicate effectively without compromise.