aviation headset, perfect passive noise attenuation, dynamic headphones
General Description
The headset HME 26 is lightweight and features a very high wearing comfort. The dynamic and closed headphones provides a perfect passive noise attenuation and ensures superior audio quality. The noise-compensating microphone performs extraordinary speech intelligibility. HME 26 is the successor of the well-known HME 25-KA and is the perfect choice for airline cockpit or business aviation cockpit. It is also suitable for General Aviation.
Features
- Lightweight
- Extremely comforable to wear, even for extended listening, due to the two-piece automatic headband and soft ear pads
- Peak Level-Protection (switchable) - safeguards you from volume peaks above 110 dB
- "Flip-away" headphone allows single-sided listening
- Flexible microphone boom, can be worn on either left of right-hand side
- Noise-compensating condenser microphone ensures excellent speech intelligibility
- single-sided cable routing
- Volume control for each channel (only with HME 26-V-K)
- ETSO-approval C57a & C58a
- Made in Germany
- 5 year warranty
aviation headset, perfect passive noise attenuation, dynamic headphones
Technical Data
| Transducer principle |
dynamic, closed |
| Ear coupling |
supra-aural |
| Frequency range |
20 Hz - 14,000 Hz |
| Impedance |
600Ω mono / 1,200Ω stereo |
| Characteristic SPL (1 kHz, 1 mW) |
92 dB SPL at 1 kHz, 1 mW, mono |
| Characteristic SPL |
97 dB SPL at 1 kHz, 1V |
| Max. sound pressure level (active) |
>125 dB SPL at 1 kHz (Peak-Level-Protection = off) |
| Total harmonic distortion (THD) |
<1% at 110 dB SPL (350 - 3,000 Hz) |
| Contact pressure |
approx. 3.6 N |
| Transducer principle (microphone) |
MKE 46 pre-polarized condenser microphone, noise-compensating |
| Frequency range |
100 - 6,000 Hz |
| Output voltage |
17 - 100 mV/Pa adjustable, 80mV/Pa -2 dB (factory pre-set) = 800mV -2 dB at 114 dB SPL |
| Impedance |
150 - 2,200Ω (terminating) |
| Operating voltage (stand alone) |
8 - 16 VDC |
| Operating temperature |
-15 °C - +55 °C |
| Storage temperature |
-55 °C - +70 °C |
| Weight w/o cable |
approx. 7 oz (200 g) |
aviation headset, perfect passive noise attenuation, dynamic headphones
Recommended Accessories
| Part/Accessory |
Article No. |
| BAG-180x220x85 |
077408 |
Carrying case for 46 and 26 series
|
| Cable-C |
500840 |
Connection cable with XLR-5 connector
|
| Cable-K |
500841 |
Connection cable with jack plugs
|
| Cable-N |
500834 |
Connection cable with 8-pin Neutricon connector
|
| Cable-V-K |
500847 |
Connection cable with jack plugs and volume control
|
| Carrying bag |
517619 |
Carrying bag for HME 43-x
|
| Ear pads |
538258 |
Leatherette, 1 pair
|
| Ear pads |
538259 |
Leatherette, 100 pair (bulk)
|
| Ear pads |
532724 |
Velour - 1 pair
|
| Headband cushion |
515629 |
Headband padding (1 pair) 46 and 26 series
|
| HZC 08 |
525787 |
Cable Clip
|
| HZH 26 Black |
504062 |
Hygiene pads - 200 pair per master carton
|
| HZH 26 White |
502595 |
Hygiene pads - 200 pair per master carton
|
| Windscreen |
514127 |
Windscreen for 46 and 26 series (bulk pack)
|
aviation headset, perfect passive noise attenuation, dynamic headphones
Variants
| HME 26 |
Article #502395 |
| Boomset without cable |
| HME 26-V-K |
Article #502935+500847 |
| Boomset wired for stereo/mono operation, has left/right volume control |
Glossary
| Contact pressure |
| The wearing comfort of a set of headphones is determined not only by its weight but also by the force with which the earpieces are pressed onto the ears. This force is given in newtons (N), whereby 1 N corresponds to the compressive force which a mass of about 100 g exerts on a solid surface. The DIN Standard 45500 Part 10 limits the maximum permissible contact force to 5 N. Values of between 1.3 and 4 N are common, although lower values apply for open headphones. Higher values can be found in the case of closed headphones. Here, a higher contact pressure is required in order to achieve sufficient sealing, which is important for the reproduction of low frequencies. |
| Ear coupling |
| A distinction is made between headphones which are worn on the external ear (supra-aural) and those which surround the ear (circumaural). Open headphones have foam ear pads that rest on the ears or ring pads that surround the ears. Closed headphones, on the other hand, nearly always have circumaural ear pads. |
| Impedance |
| Impedance expresses the AC resistance of a microphone or a set of headphones. It is dependent on frequency and is given at 1 kHz as the so-called nominal impedance. Impedance is measured in ohms. In recent years, an industrial standard has developed, setting the impedance of headphones at 50 or 600 ohms. Sennheiser headphones are manufactured according to this standard, thus practically ruling out connection problems. With microphones, the input impedance of the following microphone amplifier should have at least three times the value of the nominal impedance, in order to prevent it from unnecessarily attenuating the microphone signal. |
| Max. sound pressure level (active) |
| The maximum sound pressure a unit can reproduce before a given THD is reached. |
| Operating temperature |
| Gives the range of temperatures at which a unit can be operated without damage. |
| Operating voltage (stand alone) |
| Voltage type and level required for powering a unit. |
| Output voltage |
| The (signal) voltage which a unit supplies at its output. |
| Storage temperature |
| Gives the range of temperatures at which a unit can be stored without damage. |
| Total harmonic distortion (THD) |
| Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %. Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%. |
| Transducer principle |
| Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way. |
| Transducer principle (microphone) |
| Operating principle of a microphone. The transducer may be dynamic, piezoelectric or condenser. |
