lightweight closed aviation headset, Active Noise Reduction, dynamic headphones
General Description
The HMEC 26 is a lightweight closed and supraaural aviation headset with Active Noise Reduction NoiseGard™. The variant HMEC 26-T features in addition the Talk-Through-Function. By pressing the button on the headset a direct communication with the flight crew is possible while wearing the headset. Speech will be conveyed through the earphones by the Talk-Through microphones. NoiseGard™ will still protect from ambient noise while the feature Talk-Through is active.
Features
- Lightweight
- Extremely comforable to wear, even for extended listening, due to the two-piece automatic headband and soft ear pads
- Active Noise Reduction NoiseGard™
- Talk-Through-Function with HMEC 26-T
- 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
- ETSO-approval C57a & C58a / TSO approval C139
- Made in Germany
- 5 year warranty
lightweight closed aviation headset, Active Noise Reduction, dynamic headphones
Technical Data
| Transducer principle |
dynamic, closed |
| Ear coupling |
supra-aural |
| Frequency range |
20 - 14,000 Hz; 100 - 6,000 Hz |
| Impedance |
150 - 2,200Ω (terminating impedance) |
| Characteristic SPL (1 kHz, 1 mW) |
92 dB SPL at 1 kHz, 1V |
| Characteristic SPL |
95 dB SPL at 1 kHz, 1V |
| Max. sound pressure level (active) |
120 dB at 1 kHz |
| Total harmonic distortion (THD) |
< 1% at 1kHz, 95 dB SPL |
| Contact pressure |
approx. 3.6 N |
| Output voltage |
17-100 mV/ Pa adjustable, 80mV/Pa -2dB (default setting) 800 mV -2 dB to 114 dB SPL |
| Operating voltage (stand alone) |
8 - 16 VDC |
| Operating temperature |
-15 °C - +55 °C |
| Storage temperature |
-55 °C - +70 °C |
| Weight w/o cable |
approx 7.4 oz (210 g) |
lightweight closed aviation headset, Active Noise Reduction, dynamic headphones
Recommended Accessories
| Part/Accessory |
Article No. |
| Audio cable |
520316 |
Audio cable, 3.5 mm jack
|
| BAG-180x220x85 |
077408 |
Carrying case for 46 and 26 series
|
| Cable-B-CP |
500837 |
Cable with XLR-5 Stecker, NoiseGard™ - power supply from batteries or aircraft cockpit DC
|
| Cable-B-K |
502183 |
Cable B-K to go with HMEC26-T
|
| Cable-B-KP |
504047 |
Cable with jack plugs, NoiseGard™ - power supply from batteries or aircraft cockpit DC (available only on request)
|
| Cable-BV-CP |
500838 |
Cable with XLR-5 Stecker and volume control, NoiseGard™ - power supply from batteries or aircraft cockpit DC
|
| Cable-BV-K |
500839 |
Cable-BV-K to go with HMEC 26-T
|
| Cable-BV-KP |
504030 |
Cable with jack plugs and volume control, NoiseGard™ - power supply from batteries or aircraft cockpit DC, sockets for audio-in and cell-phone-in (available only on request)
|
| Cable-CP |
500852 |
Cable with XLR-5 connector, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cable-KP |
500842 |
Cable with jack plugs, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cable-NP |
500855 |
Cable with Neutricon connector, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cable-V-CP |
500846 |
Cable with XLR-5 connector and volume control, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cable-V-KP |
500848 |
Cable with jack plugs and vollume control, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cable-V-KX |
502437 |
Cable with jack plugs and volume control, NoiseGard™ - power supply from aircraft cockpit DC by XLR-3 connector
|
| Cable-V-RP |
500853 |
Cable with 6-Pin Redel connector and volume control, NoiseGard™ - power supply from aircraft cockpit DC
|
| Cell phone cable |
520317 |
Cell phone cable, 2.5 mm jack
|
| Ear pads |
538258 |
Leatherette, 1 pair
|
| Ear pads |
538259 |
Leatherette, 100 pair (bulk)
|
| Headband cushion |
515629 |
Headband padding (1 pair) 46 and 26 series
|
| HZC 08 |
525787 |
Cable Clip
|
| HZH 26 White |
502595 |
Hygiene pads - 200 pair per master carton
|
| Windscreen |
514127 |
Windscreen for 46 and 26 series (bulk pack)
|
| Windscreen |
515297 |
Windscreen for 46 and 26 series (1 pair)
|
lightweight closed aviation headset, Active Noise Reduction, dynamic headphones
Variants
| HMEC 26 P/N 026-35 |
Article #502397 |
| Headset without cable |
| HMEC 26-T P/N 026-C5 |
Article #502404 |
| with the Talk Through function for easy communication in the cockpit. Headset does not include cables, see below (Cable-B-K or Cable-BV-K from accessories). |
| HMEC 26-BV-K P/N 026-35-999-1171 |
Article #502401 |
| with jack plugs and volume control, NoiseGard™ - power supply from batteries, sockets for audio-in and cell-phone-in |
| HMEC 26-B-CP P/N 026-35-999-2291 |
Article #502398 |
| with XLR-5 Stecker, NoiseGard™ - power supply from batteries or aircraft cockpit DC |
| HMEC 26-BV-CP P/N 026-35-999-2281 |
Article #502400 |
| with XLR-5 Stecker and volume control, NoiseGard™ - power supply from batteries or aircraft cockpit DC |
| HMEC 26-KP P/N 026-35-999-3111 |
Article #502403 |
| with jack plugs, NoiseGard™ - power supply from aircraft cockpit DC |
| HMEC 26-V-KP P/N 026-35-999-3161 |
Article #502406 |
| with jack plugs and vollume control, NoiseGard™ - power supply from aircraft cockpit DC |
| HMEC 26-CP P/N 026-35-999-3211 |
Article #502402 |
| with XLR-5 connector, NoiseGard™ - power supply from aircraft cockpit DC |
| HMEC 26-V-CP P/N 26-35-999-3251 |
Article #502405 |
| with XLR-5 connector and volume control, NoiseGard™ - power supply from aircraft cockpit DC |
| HMEC 26-V-RP |
Article #502397+500853 |
| HMEC 26-B-K variant with 6-pin Redel connector and volume control (US market only) |
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. |
