HME 46-3S
ATC headset with electret microphone. Single-sided, open headphone design for Air Traffic controllers and C3 operations that need to have one ear free. Superb wearing comfort due to patended two-piece automatic headband and soft ear pads.
Article No. 502592
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The HME 46-3S is a very lightweight single-sided and comfortable open boomset. It is ideal for air traffic control. The headset is equipped with ActiveGard©, which protects controllers from the effects of an acoustic burst.

  • Very light weight

  • Superb wearing comfort due to patended two-piece automatic headband and soft ear pads

  • Flip-away headphone allows single-sided listening

  • Flexible microphone boom, can be worn on either left or right-hand side

  • Noise-compensated condensor microphone ensures excellent speech transmission

  • Also available with PTT

  • ActiveGard safeguards the user from the effects of an acoustic burst

  • Delivery content w/o cable. Different cable configurations due to accessory list are available

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What's in the Box
  • 1 Headset HME 46-3S
  • 1 Cable clip
  • 1 Wind and pop screen
  • 1 user manual

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  • What are NRR (Noise Reduction Ratings) for a headset?

    NRR (Noise Reduction Ratings) is a rating of the passive reduction of a headset and this is by a set standard (ANSI).

    However there are no present standards for measuring ANR (Active Noise Reduction). Each Manufacturer uses their own standards. Sennheiser uses the standards and results of an independent laboratory that is accredited by the National Institute of Standards and Technology. One should be very careful in assuming that all manufacturers use these results in a fair and unbiased way.

  • Which accessories come with my ATC/C3 headset purchase?

    Your purchase of a Sennheiser ATC/C3 headset will include a windscreen, clip, bag, and manufacturer certificates.

  • Why is it a good idea to have a mic gain adjustment on your microphone?

    The microphone gain adjustment on a microphone gives the technician the ability to make adjustments for minor anomalies that may occur. While the microphone may work fine often a small adjustment may make a big difference in the total performance of the microphone.

  • Active Noise Cancellation

    Active noise cancellation is the reduction of noise, particular in the low frequency range, by using active noise compensation electronic circuitry. Active noise cancellation is measured in decibels (dB).

  • Caliper Pressure (Contact Pressure)

    Caliper Pressure (sometimes referred to as Contact Pressure) is the amount of force applied to the sides of the head while wearing headphones. Caliper pressure is measured in Newton’s (N) and could range from 1.6 N (loose fit) to 10 N (snug fit).

    A tight coupling between the headphone and the ear is necessary in order to maximize passive attenuation however too much pressure can make the headphone uncomfortable to wear for long periods of time. 

  • Condenser Microphone (Electret Microphone)

    A CONDENSER or ELECTRET microphone is one that is based on an electrically charged diaphragm (or back plate) assembly which forms a sound-sensitive capacitor.

    On a condenser or electret microphone a very thin metal or metal coated-plastic diaphragm is mounted just in front of a ridged metal or metal-coated-ceramic back plate. This assembly is known as a capacitor (condenser) which has the ability to store a charge or voltage. When the element is charged an electrical field is created between the diaphragm and the back plate proportional to the spacing between them. Sound waves vibrate the diaphragm and it is the vibration of this spacing due to the motion of the diaphragm relative to the back plate that produces the electrical signal corresponding to the sound picked up by a condenser microphone. 

    The construction of a condenser microphone must include some provision for maintaining the electrical charge or polarizing voltage.

    NOTE: An Electret condenser microphone has a permanent charge maintained by a special material (Electret) deposited on the back plate or on the diaphragm.

  • Diaphragm

    The diaphragm is a  thin membrane in a microphone which moves in response to sound waves.

  • Gain

    Gain is the amount of increase in audio signal strength. Gain is often expressed in decibels (dB).

  • Microphone Gain Control

    Microphone Gain Control is a  level control on a microphone preamplifier that sets gain and is used to prevent overload of a preamplifier.

  • Output Voltage

    Output Voltage is similar to sensitivity except it takes into account additional electronics used to amplify the signal. This is typically measured over a range of frequencies and will include the term + or - 3 dB. Rather than using 1 Pascal this specification may also include the input level used such as 114 dB at a distance of 6 mm.

  • Passive Attenuation

    Passive attenuation is the ability of the headset to reduce the ambient noise level by merely wearing the headset without the aid of any electronic assistance (ie: active noise compensation circuitry). Passive attenuation is measured in decibels (dB).

  • Pre-Amp

    A Pre-Amp is a low-noise amplifier designed to take a low-level signal (such as that from a microphone) and bring it up to normal line level.

  • Sensitivity

    Sensitivity  is a measurement of how much voltage is produced by a microphone for a specific measured input (1 Pascal). Sensitivity is measured in micro volts (uV) or millivolts (mV).

    A typical rating for a dynamic microphone would be 1 mV. A typical rating for an Electret microphone would be 3.5 to 10 mV A typical rating for an Electret with amplifier would be 170 mV. 

    The higher the number the stronger the signal produced by the microphone.

  • XLR-3 Connector

    The XLR-3 Connector is a single connector that can be used in place of the PJ055 headphone and the PJ068 microphone plugs on some Sennheiser headsets.

    Pin 5 of this plug can also be used to provide aircraft power for the NoiseGard power supply on some Sennheiser headsets.

  • XLR-5 Connector

    The XLR-5 connector is a single connector that can be used in place of the PJ055 headphone and the PJ068 microphone plugs on some Sennheiser headsets.

    Pin 5 of this plug can also be used to provide aircraft power for the NoiseGard power supply on some Sennheiser headsets.


  • Instruction Manual
    • Instruction manual - HMD 46 / HME 46 (1.5 MB) Download

  • Digital Brochures
  • EU Declaration of Conformity
    • EU Declaration of Conformity HME_46_series (210 KB) Download

WARNING (for California residents only): This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects and other reproductive harm. For more information go to:

Most users do not need a license to operate a wireless microphone system. Nevertheless, operating a microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC’s wireless microphone website at