Manuals+

Sennheiser ACCENTUM Wireless Headphones

Model: ACAEBT

Important Safety Instructions

Read this instruction manual carefully and completely before using the product.

Always include this instruction manual when passing the product on to third parties.

Do not use the product if it is obviously defective or makes loud, unusual (whistling or beeping) noise.

Only use the product in environments where Bluetooth wireless transmission is permitted.

Preventing damage to health and accidents

Protect your hearing from high volume levels. Permanent hearing damage may occur when headphones are used at high volume levels for long periods of time. Sennheiser brand headphones sound exceptionally good even at low and medium volume levels.

The product generates stronger permanent magnetic fields that could cause interference with cardiac pacemakers, implanted defibrillators (ICDs) and other implants. Always maintain a distance of at least 3.94"/10 cm between the product component containing the magnet and the cardiac pacemaker, implanted defibrillator, or other implant.

Keep the product, accessories and packaging parts out of reach of children and pets to prevent accidents. Swallowing and choking hazard.

Do not use the product in an environment that requires your special attention (e.g. in traffic). Especially the product's active noise cancellation can make ambient sounds inaudible or drastically change the perception of acoustic warning signals.

Preventing damage to the product and malfunctions

Always keep the product dry and do not expose it to extreme temperatures (hairdryer, heater, extended exposure to sunlight, etc.) to avoid corrosion or deformation. The normal operating temperature is from 0 °C to 40 °C/32 °F to 104 °F.

Do not use if immersed into liquid.

To avoid loud, unusual (whistling or beeping) noise and to ensure proper noise cancellation, do not cover the microphone openings of the active noise cancellation circuitry located on the outside of the ear cups.

Use only attachments/accessories/spare parts supplied or recommended by Sonova Consumer Hearing.

Clean the product only with a soft, dry cloth.

Safety instructions for Lithium rechargeable batteries

⚠ WARNING: If abused or misused, rechargeable batteries may leak. In extreme cases, they may even present a risk of: explosion, heat and fire development, smoke and/or gas development, damage to health and/or the environment.

Only use rechargeable batteries and chargers recommended by Sonova Consumer Hearing.

Do not leave the product / rechargeable batteries unattended while charging.

Only charge the product / rechargeable batteries at ambient temperatures between 10 °C and 40 °C/50 °F and 104 °F and do not charge them near easily flammable objects.

Do not charge the product / rechargeable batteries in a damp environment. Make sure that the charging socket is free from moisture and contamination.

Do not heat the product / rechargeable batteries above 60 °C/140 °F. Avoid exposure to sunlight and do not throw the product / rechargeable batteries into fire.

Switch rechargeable battery-powered products off after use.

When not using the product / rechargeable batteries for extended periods of time, charge them regularly (about every three months).

Avoid prolonged skin contact with the product, rechargeable battery, charger or charging cable when connected to a power source. These components can heat up during charging and cause skin irritation.

Dispose of defective products with built-in rechargeable batteries at special collection points or return them to your specialist dealer to facilitate recycling.

Notes on data collection and processing and on firmware updates

This product stores individual settings such as the volume, the sound profiles and the Bluetooth connection data of paired devices. This data is required for the operation of the product and is not transferred to Sonova Consumer Hearing GmbH or companies commissioned by Sonova Consumer Hearing GmbH and is not processed.

Using the "Sennheiser Smart Control" app, you can update the firmware of the product for free via an Internet connection. If the device on which the app is installed is connected to the Internet, the following data is automatically transferred to and processed by Sonova Consumer Hearing servers in order to provide and transfer suitable firmware updates: hardware identifier, hardware revision number, firmware version of the product, operating system type (Android, iOS) and version, version of the app. The data will only be used as specified and will not be stored permanently.

If you do not want this data to be transferred and processed, do not connect to the Internet.

Notes on the use of headphones in damp environments

Headphones are an everyday companion. When using the headphones on the go, they may be exposed to moisture. For example, rain, air humidity or even sweat may come into contact with the headphones.

To ensure proper, safe and long-lasting performance:

If your headphones have become damp or wet:

Do not continue to use the product if it is obviously defective.

Intended use/Liability

These headphones have been designed as an accessory for Bluetooth compliant devices. They are intended for wireless audio communication such as music playback and phone calls via Bluetooth wireless technology.

It is considered improper use when the product is used for any application not named in the corresponding product documentation.

Sonova Consumer Hearing GmbH does not accept liability for damage arising from misuse or improper use of this product and its attachments/accessories.

Sonova Consumer Hearing GmbH is not liable for damages to USB devices that are not consistent with the USB specifications.

Sonova Consumer Hearing GmbH is not liable for damages resulting from the loss of connection due to flat or overaged rechargeable batteries or exceeding the Bluetooth transmission range.

Before putting into operation, please observe the respective country-specific regulations.

Package Contents

The package contains:

Online resources:

Product Overview

Diagram of the Sennheiser ACCENTUM headphones showing key components:

1. Ear pads, 2. Headband (steplessly adjustable), 3. Ear cups, 4. Two speech microphones for phone calls, 5. LED display, 6. USB C socket for charging, calling, and streaming via PC/Mac, 7. Volume + button, 8. Music and voice control button, 9. Volume - button.

Main Button and Other Controls

Overview of the controls

Switch-on of the headphones: Press the main button for 3 seconds.

Diagram illustrating how to switch on the headphones: Press and hold the main button for 3 seconds.

Overview of the LED display

During operation
During phone calls
During charging

If the LED display does not light up:

You can speed up the charging process by charging the headphones when they are switched off.

Overview of sound signals and voice prompts

The headphones output voice prompts and sound signals in case of various events.

Via the Smart Control app, you can adjust settings for the voice prompts and sound signals.

Voice prompt

You hear short sound signals when the headphones:

Getting Started

1. Charging the rechargeable battery

The headphones' rechargeable battery is not fully charged upon delivery. Before using the headphones for the first time, charge the rechargeable battery for a complete charging cycle without interruption.

Diagram showing the charging process: Connect the USB C end of the cable to the headphones' USB C socket and the USB A end to a compatible USB power source.

2. Connecting the headphones to a Bluetooth device

Connect the headphones to your smartphone via Bluetooth.

Diagram illustrating Bluetooth connection: Smartphone icon, headphones icon, Bluetooth symbol, and checkmarks indicating a successful connection.

3. Smart Control app for your smartphone

The Sennheiser Smart Control app allows you to use all functions and settings of the headphones and to adjust the sound, for example, using the equalizer.

Download the app from the App Store or Google Play. QR codes are provided for direct download.

4. Putting the headphones on and adjusting the headband

For good sound quality and best possible wearing comfort, the headband can be adjusted to properly fit your head.

Diagrams showing how to put on the headphones and adjust the headband for a comfortable and secure fit.

Using the Headphones

Information on the rechargeable battery and the charging process

The headphones have a built-in rechargeable battery. A complete charging cycle takes approximately 3 hours. The charging time can vary depending on the power source used and the ambient temperature.

Before using the headphones for the first time, charge the rechargeable battery for a complete charging cycle without interruption.

When the headphones are being charged, the LED display lights up. Once the headphones are 100% charged, the LED lights up green for 5 minutes and then goes off. When the battery charge drops to a low level, the voice prompt "Recharge headset" asks you to recharge the headphones. If the headphones are not charged, the voice prompt will be repeated every 10 minutes until the headphones switch off.

Sonova Consumer Hearing recommends using the supplied USB cable and a compatible standard USB power supply for charging the headphones.

While the headphones are being charged, you can still listen to music or make phone calls. In this case, however, the charging time may be longer.

At the end of its operational lifetime, this product with its built-in rechargeable battery must be disposed of separately from normal household waste. More information can be found at reference number 33.

Charging the headphones' rechargeable battery

Diagram showing the charging process: Connect the USB C end of the cable to the headphones' USB C socket and the USB A end to a compatible USB power source.

LED status during charging:

If the LED display does not light up:

You can speed up the charging process by charging the headphones when they are switched off.

If you disconnect the USB connection during or after charging, you will hear a voice prompt informing you of the remaining battery life.

Connecting the headphones to a Bluetooth device

To be able to use the Bluetooth connection, you must register both devices (headphones and e.g. smartphone) once. This process is called pairing.

If operation differs from the steps mentioned, also refer to the instruction manual of the Bluetooth device you are using.

If you switch on the headphones for the first time (the pairing list is empty), they automatically switch to pairing mode.

Information on the Bluetooth wireless connection

The headphones are compliant with Bluetooth 5.2.

If your audio source supports one of the following high-resolution audio encoding methods, music is automatically played in high audio quality: aptX HD or AAC. Otherwise the headphones will play your music in normal audio quality (SBC).

Paired devices establish the Bluetooth wireless connection immediately after switch-on and are ready for use.

On switch-on, the headphones automatically try to connect to the last two connected Bluetooth devices. The headphones can save the connection profiles of up to six Bluetooth devices with which they have been paired. Audio playback is only possible from one device at a time.

If you pair the headphones with the seventh Bluetooth device, the saved connection profile of the least used Bluetooth device will be overwritten. If you want to re-establish a connection with the overwritten Bluetooth device, you have to pair the headphones again.

Diagram showing various devices (phone, laptop, tablet, speaker, headphones) connected via Bluetooth. Icons indicate paired/connected and paired/not connected devices.

Pairing the headphones with a Bluetooth device

If you switch on the headphones for the first time (the pairing list is empty), they automatically switch to pairing mode.

  1. Switch the headphones off and place them close to the Bluetooth device (max. 20 cm).
  2. Press the main button for 3 seconds. The headphones are switched on and you hear a sound signal. The LED lights up white for 5 seconds.
  3. Press the main button for 5 seconds. The headphones switch to pairing mode. The LED flashes alternately white and red.
  4. Activate Bluetooth on your Bluetooth device.
  5. Via the menu of your Bluetooth device, start the search for new Bluetooth devices. All active Bluetooth devices in the proximity of your Bluetooth device are displayed. By default, the name of the headphones is "ACCENTUM". You can individually adjust the name in the Smart Control app.
  6. From the list of found Bluetooth devices, select "ACCENTUM". If necessary, enter the default pin code "0000".
  7. If pairing was successful, you hear the voice prompts "Pairing successful" and "Connected" one after the other. The LED flashes white 3x.

Diagram illustrating Bluetooth pairing steps: 1. Place headphones near the device. 2. Press main button for 3 seconds (LED white 5s). 3. Press main button for 5 seconds (LED white/red flashes). 4. Activate Bluetooth on your device. 5. Search for devices. 6. Select 'ACCENTUM'. 7. Pairing successful (LED white 3x).

If no connection is established within 2 minutes, pairing mode is terminated and the headphones switch to standby mode. If necessary, repeat the steps described above.

Switching the connection to paired Bluetooth devices/"Connections"

To selectively switch the audio connection to paired Bluetooth devices using the "Connections" function, you require the Smart Control app.

In the Smart Control app, tap "Connections". The list of Bluetooth devices paired with the headphones appears. From the list, select the paired device to which you want to connect the headphones. Make sure that the desired device is switched on and Bluetooth is activated. The Bluetooth audio connection between the desired Bluetooth device and the headphones is established.

The app connection between the device with the Smart Control app installed and the headphones remains active (only Bluetooth Low Energy for communication between app and headphones, the device name is highlighted in bold).

The "Connections” function also allows you to selectively delete pairing information of devices without resetting the headphones to the factory default settings.

Disconnecting the headphones from a Bluetooth device

Via the menu of your Bluetooth device, disconnect the connection to the headphones. The headphones are disconnected from the Bluetooth device. You hear the voice prompt "No connection". The headphones switch to standby mode.

To delete the Bluetooth pairing list of the headphones: See reference number 31.

Installing the Smart Control app

To make full use of all the settings and functions of the headphones, you need to have the free Sennheiser Smart Control app installed on your smartphone.

Download the app from the Apple App Store or Google Play and install it on your smartphone. Alternatively, you can use your smartphone to scan the following QR code or to call up the following Internet site: www.sennheiser-hearing.com/smartcontrol

Connect your smartphone to the headphones via Bluetooth. Start the Smart Control app. Follow the instructions in the app. The Smart Control app recognizes the headphones and activates all available settings and functions.

Switching the headphones on

⚠ WARNING: Danger due to high volume levels! Listening at high volume levels can lead to permanent hearing defects. Before putting the headphones on, adjust the volume to a low level. Do not continuously expose yourself to high volume levels.

Press the main button for 3 seconds. The LED lights up white for 5 seconds. You hear a sound signal. If Bluetooth is activated on the headphones and a paired device is available, the LED flashes white 3x and you hear the voice prompt "Connected".

If Bluetooth is deactivated on the headphones, you only hear a sound signal.

Diagram illustrating how to switch on the headphones: Press and hold the main button for 3 seconds. LED lights up white for 5 seconds, then flashes white 3x if connected.

Make sure that Bluetooth is already activated on your Bluetooth device when switching on the headphones.

If Bluetooth is activated and the headphones cannot find a paired Bluetooth device within a few minutes, you hear the voice prompt “No connection”. The LED flashes red 3x. The headphones switch to standby mode.

Switching the headphones off

1. Press the main button for 3 seconds. You hear a sound signal. The LED flashes red 3x. The headphones switch off.

Diagram illustrating how to switch off the headphones: Press and hold the main button for 3 seconds. LED flashes red 3x.

Putting the headphones on and adjusting the headband

For good sound quality, the best possible noise cancellation and the best possible wearing comfort, the headband can be adjusted to properly fit your head.

Wear the headphones so that the headband runs over the top of your head. The markings for the right side (R) and for the left side (L) can be found on the inside of the ear cups.

Move the ear cups up or down the headband slider until:

For optimal sound quality, the ear pads must completely surround your ears.

Diagrams showing how to put on the headphones and adjust the headband for a comfortable and secure fit, ensuring ear pads cover the ears.

Retrieving information on the battery charge status

When the headphones are connected to your Bluetooth device, the battery charge status can be displayed on the screen of your smartphone (depending on the device and operating system used). The Smart Control app also displays the battery charge status.

On the headphones, you can retrieve information on the battery charge level via the voice prompts (also possible while listening to music or talking on the phone, as long as you have the headphones on):

Press the music and call control button for 3 seconds. You hear a voice prompt informing you of the remaining battery life. The LED flashes/lights up depending on the battery life of the headphones.

Diagram showing the music and call control button being pressed for 3 seconds to retrieve battery status.

Adjusting the volume

⚠ WARNING: Danger due to high volume levels! Listening at high volume levels can lead to permanent hearing defects. Toggling between the audio sources may cause enormous volume jumps that can permanently damage your hearing. Before putting the headphones on and before toggling between audio sources, adjust the volume to a low level. Do not continuously expose yourself to high volume levels.

You can adjust the playback volume for music and for phone calls.

If you are playing music, are on a call or if the headphones are in idle mode (i.e. you are neither playing music nor are on a call): Press the volume + or the volume – button to increase or decrease the volume for music, voice prompts and sound signals.

When the maximum or minimum volume is reached, you hear the voice prompt "Volume max" or "Volume min".

Depending on the length of the button press, you adjust the volume in smaller increments (short button press) or larger increments (long button press).

When switching the headphones off, very high volume levels are automatically reset to a moderate level to protect your hearing when you switch the headphones on again.

Diagrams showing finger pressing volume up (+) and volume down (-) buttons on the headphones.

You can also adjust the volume using the connected Bluetooth device.

If you have activated the voice assistant and then change the volume of the headphones, the volume of the voice assistant is adjusted accordingly and saved permanently.

Information on active noise cancellation (ANC)

Due to its closed design, the headphones offer effective passive isolation from ambient noise. In addition, the headphones have an active noise cancellation (ANC) function, which allows you to reduce ambient noise to a minimum. Even with ANC, the sound quality of your headphones is always at its best.

If you want to create a quiet space in a noisy environment, you can simply use the headphones – without connected cables and without Bluetooth devices – as noise protection by using ANC.

Notes on active noise cancellation

Diagram showing headphones with arrows pointing to microphones on the outside of the ear cups.

Information on the Transparency Mode – Hearing ambient sounds or conversations

With the Transparency Mode activated, you can hear ambient sounds or communicate without having to remove the headphones (not possible when making phone calls). This allows you to hear e.g. announcements in the train or aircraft or to have short conversations.

The Transparency Mode optimally complements the active noise cancellation ANC.

If you use the Transparency Mode, disturbing sounds, e.g. low-frequency noise such as aircraft noise, are always suppressed so that you can stay relaxed and in touch with your surroundings.

Switching between the active noise cancellation ANC and the Transparency Mode

You can use the main button to switch between the active noise cancellation ANC and the Transparency Mode, e.g. if you want to transition from ambient awareness to idle mode as quickly as possible. This function is not available during an active call.

To switch between the modes, press the main button 2x.

Diagram showing double-press of the main button to switch between ANC and Transparency Mode.

Adjusting the playback pause in the Transparency Mode

You can select how the audio playback behaves in the Transparency Mode (press the main button 2x). To be able to adjust this setting, you require the Smart Control app.

In the Smart Control app, select the desired Transparency Mode function in the "Active Noise Cancellation" section:

*default setting

Adjusting the active noise cancellation ANC

To be able to adjust settings for the active noise cancellation ANC, you require the Smart Control app.

Select the desired setting in the “Active Noise Cancellation” section of the Smart Control app:

ANC setting Reduction of low-frequency noise and background noise
"Wind Noise Reduction" Off: Wind noise reduction off
On*: Automatically adjusted reduction to minimize disturbing wind or movement noise

*default setting

Listening to music using the headphones

You can listen to music when the headphones and your audio source are connected via Bluetooth or via USB.

Controlling music playback

The following music functions are only available when the headphones and the device are connected via Bluetooth or USB. Some smartphones or music players may not support all functions.

Use the music and call control button and the main button:

If music playback does not start:

Playing the next/previous track

Press the music and call control button several times.

Making phone calls using the headphones

The following call functions are only available when the headphones, the smartphone or the PC/Mac are connected via Bluetooth. Some smartphones or communication apps may not support all functions. During a call, the active noise cancellation ANC is always activated to ensure the best possible speech intelligibility. The Transparency Mode cannot be used.

If the headphones are switched off during an active call or if the rechargeable battery is empty, the call is put on hold and you can use your smartphone as an output device as usual.

Making a call

Dial the desired number on your smartphone. If your smartphone does not automatically transfer the call to the headphones, select "ACCENTUM” as the output device on your smartphone (see the instruction manual of your smartphone if necessary).

Accepting/rejecting/ending a call

If your headphones are connected to a smartphone and you receive a call, you hear a ring tone in the headphones. If you are playing music when you receive a call, the music pauses until you end the call.

Use the music and call control button:

Muting the microphone

To mute the headphones' microphone during a call:

Press the main button 1x. You hear the voice prompt “Mute on”. The microphone is muted.

To activate the microphone again:

Press the main button 1x. You hear the voice prompt “Mute off”. The microphone is reactivated.

Diagram showing microphone mute: Press the main button once (1x) to mute or unmute the microphone.

Using the Sidetone function

When using the headphones for phone calls, you may find it more comfortable if your own voice is audible in the headphones. With the Sidetone function activated, your own voice is played back through the headphones during a phone call.

Via the Smart Control app, you can activate the function (default setting) and adjust the intensity via a slider or deactivate the function.

Using the voice assistant/voice dialing

The voice assistant is only available when the headphones and the mobile device are connected via Bluetooth or USB. Some smartphones or music players may not support all functions.

Press the main button 1x. The available voice assistant of your mobile device is activated (depending on the system used or app installed on your mobile device: Siri, Google Assistant or others. If no voice assistant is available, voice dialing may be activated).

Speak your request.

Diagram showing voice assistant activation: Press the main button once (1x) to activate the voice assistant.

To cancel the voice assistant or voice dialing:

Press the main button 1x.

Diagram showing voice assistant cancellation: Press the main button once (1x) to cancel.

Adjusting sound effects/the equalizer

To be able to use the sound effects/the equalizer, you require the Smart Control app.

In the Smart Control app, select the desired sound effects via the equalizer. You can use predefined presets, define sound modes (e.g. bass boost) or define your own settings. The sound effects are stored in the headphones. These sound settings are active even without using the Smart Control app, i.e. when you are using a different Bluetooth device.

The Sound Check function of the Smart Control app allows you to create customized equalizer presets. Sound Check guides you step by step to the optimal results.

Setting the voice prompts/sound signals

To be able to set the voice prompts and sound signals, you require the Smart Control app.

In the app settings, you can activate voice prompts and sound signals (default setting) or deactivate them completely.

Deactivating Bluetooth/activating flight mode

Deactivate the Bluetooth wireless connection when wireless connections are not allowed, such as on an aircraft during take-off and landing. The active noise cancellation ANC can be fully used provided that the rechargeable battery is charged.

To deactivate the Bluetooth wireless connection and activate flight mode:

Press the main button 5x. You hear the voice prompt “No connection”. The Bluetooth wireless connection is deactivated.

Diagram showing flight mode activation: Press the main button five times (5x) to deactivate Bluetooth and activate flight mode.

To activate the Bluetooth wireless connection again:

Press the main button 5x. You hear the voice prompt "Connected”. The Bluetooth wireless connection is activated.

Connecting the headphones using the USB cable

When you connect the headphones to a Mac/PC/mobile device using the supplied USB cable, you can play audio content from your Mac/PC/mobile device directly through the headphones.

The headphones are automatically charged when you connect them to a Mac/PC/mobile device using the USB cable.

Setting up the headphones as the default audio output and audio input device for your Mac/PC/mobile device

Make sure that possible Bluetooth connections are disconnected.

Connect the headphones and the Mac/PC or mobile device via the USB cable. The headphones are charged via the USB connection.

From the Systems Preferences or Control Panel of your Mac/PC/mobile device, select "ACCENTUM" as the default audio playback device and/or default audio recording device.

Start music playback from the Mac/PC/mobile device. The music is played through the headphones and the microphone is used for recording.

Diagram showing USB connection: USB C to headphones, USB A to computer.

Storing and transporting the headphones

⚠ CAUTION: Pointed objects can damage the product! If pointed objects pierce the ear pads of the product, the ear pad and the function of the product may be damaged.

Do not transport the product in your bag together with pointed objects.

Handle the headphones with care when you are not using or transporting them. Store the headphones in a clean, dust-free place out of reach of sharp objects.

Care and Maintenance

⚠ CAUTION: Liquids can damage the electronics of the product! Liquids entering the housing of the product can cause a short-circuit and damage the electronics.

Clean the parts of the product only with a soft, dry cloth.

To clean the charging socket:

Replacing the ear pads

For reasons of hygiene, you should replace your ear pads from time to time. Spare ear pads are available at www.sennheiser-hearing.com/accentum-wireless (to purchase online or contact your local Sonova Consumer Hearing partner: www.sennheiser-hearing.com/service-support).

Diagrams showing how to remove and attach ear pads.

Information on the built-in rechargeable battery

Sonova Consumer Hearing GmbH ensures and guarantees that the rechargeable batteries perform at their optimum upon purchase of the product. If, upon purchase or within the warranty period, you suspect that a rechargeable battery is obviously defective or if a charging error/battery error is displayed, stop using the product, disconnect it from the power supply system and contact your Sonova Consumer Hearing partner. Your Sonova Consumer Hearing partner will coordinate the repair/replacement with you.

Do not return a product with a defective battery to your dealer or Sonova Consumer Hearing partner unless requested to do so. To find a partner in your country, search at www.sennheiser-hearing.com/service-support.

At the end of its operational lifetime, this product with its built-in rechargeable battery must be disposed of separately from normal household waste. You can find more information here: reference number 33.

Installing firmware updates

Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app. Sonova Consumer Hearing recommends to always install the latest firmware version to ensure the best performance of your product.

FAQ / If a Problem Occurs

If a problem has occurred, proceed in the following order until the problem is solved and you can use the headphones again:

  1. Press the main button for 15 seconds (reset).
  2. Connect the headphones to the Smart Control app to install the latest firmware.
  3. Reset the headphones to the factory default settings.
  4. Check the list of frequently asked questions to see if there is a solution to the problem.
  5. Contact your Sonova Consumer Hearing partner to solve the problem.

Current list of frequently asked questions (FAQ)

Visit the ACCENTUM product page at www.sennheiser-hearing.com/download. There you will find a current list of frequently asked questions (FAQ) and suggested solutions.

Your question has not been answered or the problem persists?

If a problem occurs that is not listed in the FAQ section or if the problem cannot be solved with the proposed solutions, please contact your Sonova Consumer Hearing partner for assistance. To find a partner in your country, search at www.sennheiser-hearing.com/service-support.

Leaving the Bluetooth transmission range

Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone. The transmission range largely depends on environmental conditions such as wall thickness, wall composition etc. With a free line of sight, the transmission range of most smartphones and Bluetooth devices is up to 10 meters.

If you, and therefore the headphones, leave the Bluetooth transmission range of the smartphone, the sound quality deteriorates increasingly until you hear the voice prompt “Lost connection” and the connection breaks down completely. If you immediately re-enter the Bluetooth transmission range, the connection is automatically re-established.

Resetting the headphones

If the function of the headphones is disturbed, perform a reset. Individual settings such as the pairing settings are not deleted.

Press the main button for 20 seconds. You hear a short confirmation sound.

Diagram showing reset: Press the main button for 20 seconds.

Deleting the Bluetooth pairing list of the headphones

You can delete the Bluetooth pairing list using the Smart Control app. Follow the instructions in the app.

Resetting the headphones to the factory default settings

To be able to reset the headphones to the factory default settings, you require the Smart Control app.

Switch on the headphones and connect them to a Bluetooth device on which the Smart Control app is available. Select the "Factory default settings” function in the app settings. Follow the instructions in the app.

Specifications

Model: ACAEBT

Attribute Specification
Wearing style Bluetooth® around-ear, closed-back
Ear coupling circum-aural
Transducer principle dynamic
Transducer 37 mm
Frequency response 10 Hz to 22,000 Hz (-10 dB)
Sound pressure level (SPL) 106 dB (1 kHz/0 dBFS)
THD (1 kHz, 100 dB SPL) < 0.3 % (1 kHz, 100 dB SPL)
Microphone principle MEMS
Microphone frequency response 50 Hz to 8,000 Hz (-3 dB)
Microphone pick-up pattern (speech audio) 2 omni-directional microphones (beamforming)
Power supply Built-in rechargeable lithium-ion battery: 3.7 V, 800 mAh, 2.96 Wh
USB charging: 5 V, 700 mA max.
Charging time of rechargeable battery approx. 3 hrs
Operating time up to 50 hrs (music playback via Bluetooth with ANC activated)
Temperature range Operation: 0 °C to +40 °C
Charging: +10 °C to +40 °C
Storage: -20 °C to +60 °C
Relative humidity (non-condensing) Operation: 10 to 80%
Storage: 10 to 90%
Weight (headphones) approx. 222 g
Magnetic field strength 3.00 mT
Bluetooth
Version Bluetooth 5.2 compliant, class 1
Transmission frequency 2,402 MHz to 2,480 MHz
Modulation GFSK, π/4 DQPSK, 8DPSK
Profiles A2DP, AVRCP, HFP, HSP, GATT
Output power 10 mW (max)
Codec aptX HD, AAC, SBC
Device name ACCENTUM (individually adjustable)
Number of active connections 2

Manufacturer Declarations

Warranty

Sonova Consumer Hearing GmbH gives a warranty of 12 months on this product. For the current warranty conditions, please visit our website at www.sennheiser-hearing.com/warranty or contact your Sonova Consumer Hearing partner.

LIMITED AVAILABILITY OF REPLACEMENT PARTS AND REPAIR SERVICES

Most Products are covered by a 2-year Limited Warranty. Please see our full warranty terms and conditions here, which also include a list of the Products the warranty applies to: www.sennheiser-hearing.com/warranty-conditions.

Beyond the terms of the Limited Warranty, Sonova Consumer Hearing GmbH does not warrant or guarantee the availability of, and hereby disclaims any implied, statutory or other warranty or guarantee of availability of, any spare or replacement parts, repair services or information necessary for the maintenance or repair of the Products offered for sale at www.sennheiser-hearing.com by Sonova Consumer Hearing GmbH.

In compliance with the following requirements

EU declaration of conformity

CE: Battery Regulation (EU) 2023/1542, RoHS Directive (2011/65/EU).

Hereby, Sonova Consumer Hearing GmbH declares that the radio equipment type ACAEBT is in compliance with the Directive 2014/53/EU. The full text of the EU declaration of conformity is available in English language at the following Internet address: www.sennheiser-hearing.com/download.

UK declaration of conformity

Notes on disposal

The symbol of the crossed-out wheeled bin on the product, the battery/rechargeable battery (if applicable) and/or the packaging indicates that these products must not be disposed of with normal household waste, but must be disposed of separately at the end of their operational lifetime. For packaging disposal, observe the legal regulations on waste segregation applicable in your country. Improper disposal of packaging materials can harm your health and the environment.

Trademarks

Apple, the Apple logo and Siri are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc.

Android and Google Play are registered trademarks of Google Inc.

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Sonova Consumer Hearing GmbH is under license.

Qualcomm aptX™ is a product of Qualcomm Technologies International, Ltd. Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries, used with permission.

aptX™ is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries, used with permission.

Other product and company names mentioned in the user documentation may be the trademarks or registered trademarks of their respective holders.

Models: ACAEBT Wireless Around Ear Headphones, ACAEBT, Wireless Around Ear Headphones, Around Ear Headphones, Ear Headphones, Headphones

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ACAEBT Manual EN

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