Technical data

NoiseGardHMEC 25-KA / -CA

 

 

Headphone

Transducer principle

dynamic, open, supra-aural

Frequency response

16 Hz - 22 kHz

Impedance

active/passive

200 Ω (mono) 400 Ω per side (stereo)

 

 

same volume for active and passive

Le bruit - il est partout !

Que ce soit sur le lieu de travail, à la maison, dans les transport publics, en avion, en train ou en car - il y a toujours du bruit.

De nombreuses études ont démontré les effets négatifs de cette pollution par le bruit - et tout le monde les connaît:

￿

nervosité

￿

manque de concentration

THD

Compensation active and passive

Frequency response of the active compensation

Transducer principle

Frequency response

(2 cm distance between mic and corner of mouth)

Max. sound pressure level Output voltage

Terminating impedance Operating voltage

Contact pressure Weight without cable Cable

Connectors HMEC 25-KA

< 1 %

15 dB + 3 dB in the range of 100 Hz - 2 kHz

50 - 600 Hz

Microphone incl. preamplifier

Noise-cancelling back-electret condenser microphone capsule

300Hz - 5 kHz (as per DO-214)

120dB (THD=1 %)

400 mV ± 3 dB at 114 dB

and a distance of 6 mm (as per DO-214)

150

8- 16 V DC, approx. 8-25 mA, connections as per RTCA/DO 214

General Data

approx. 2.5 N 170 g

single-sided, total length 1.8 m

headphone: 3-pole 1/4" (6,35mm) jack plug wired mono

microphone: PJ-068, 5.25 mm

￿ irritabilité...

-et ce sont seulement les effets les plus évidents. Le bruit attaque aussi le système neurovégétatif et peut entraîner une détérioration définitive de l´ouïe.

Les sources du bruit sont multiples, et la plupart du temps on n´est pas maître de le faire cesser. La seule solution dans un environnement bruyant est donc de se protéger individuellement. C´est surtout vrai pour les pilotes. Dans les cockpits, le bruit est un très grand problème, et souvent, le pilote doit ajuster l´ensemble casque/micro si fort qu´il risque d´endommager son ouïe de façon permanente.

Avec le système NoiseGard, Sennheiser a créé une solution très efficace. Son principe de fonctionnement et son emploi sont décrits dans ce guide.

Quelques niveaux sonores

 

140 dB

Moteur à réaction (à 25 m)

haut

130 dB

Moteur d´avion

120 dB

Perceuse pneumatique

 

110 dB

Marteau de forge, usine de béton

 

100 dB

Machine à mouler sous pression

 

 

 

 

90 dB

Usinage des métaux

 

80 dB

Tracteur

 

 

 

 

70 dB

Bureau

 

60 dB

Conversation

 

 

 

 

50 dB

Bruit ambiant

 

40 dB

Salle de séjour

HMEC 25-CA

XLR-5

Power supply

2 x 1.5 V AA sizealkaline-manganese batteries

 

(2700 mAh)

Operating time

approx. 20 hrs

Display

two-colour LED for indicating battery status

bas

30 dB

Bibliothèque

20 dB

Chambre à coucher

 

10 dB

Forêt, calme

L´unité de mesure du niveau sonore est le décibel (dB). Une atténuation sonore de 10 dB est en général perçue comme une réduction du bruit de 50 % ; si l´on atténue encore ce volume de 10 dB, la réduction sonore perçue du bruit est 75 %, et ainsi de suite.

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Sennheiser HMEC 25-CA, HMEC 25-KA manual Haut, Bas

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.