Sennheiser CX 400BT Series Instruction Manual
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Sennheiser CX 400BT Series Instruction Manual

True wireless stereo earphones
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CX 400BT True Wireless
True wireless stereo earphones
Model: CX400TW1, CX400TW1 R, CX400TW1 L, CX400TW1 C
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
"Product overview"
"Getting started"
"Using the earphones"
"FAQ/If a problem occurs ..."
"Specifications"
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 09/20 A01

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Summary of Contents for Sennheiser CX 400BT Series

  • Page 1 Use the search function, the navigation (left) or the following links: Start “Product overview” “Getting started” “Using the earphones” “FAQ/If a problem occurs ...” “Specifications” Sennheiser electronic GmbH & Co. KG Am Labor 1 30900 Wedemark Germany www.sennheiser.com Version: 09/20 A01...

  • Page 2: Important Safety Instructions

    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 headphones sound exceptionally good at low and medium volume levels. ▷...
  • Page 3 Sennheiser does not accept liability for damage arising from misuse or improper use of this product and its attachments/accessories. Sennheiser is not liable for damages to USB devices that are not con- sistent with the USB specifications. Sennheiser is not liable for dam-...

  • Page 4: Package Contents

    Online you can find: • this detailed instruction manual and additional information (www.sennheiser.com/download) • the Sennheiser Smart Control app for configuring the head- phones and for additional functions (www.sennheiser.com/smartcontrol) A list of accessories can be found on the CX 400BT True Wire- less product page at www.sennheiser.com .

  • Page 5: Product Overview

    Product overview Product overview Charging case CX400TW1 C 1 2 3 4 5 displays the charging process/charge status of the rechargeable battery of the charging case or of the earbuds (when inserted into the charging case) Input for USB-C connector for charging the rechargeable batteries LED button activates the LED display for 5 seconds...
  • Page 6 Product overview Earphones CX400TW1 R and CX400TW1 L Touch control panel Changeable silicone ear adapters Left earbud L (slave earbud, receives signals from the right earbud) Status LED Magnetic holders Charging contacts Microphones for phone calls Right earbud R (master earbud, controls the Bluetooth con- nection to the smartphone and to the left earbud) Openings for acoustic optimization Built-in rechargeable battery...

  • Page 7: Overview Of The Led Indications Of The Charging Case

    Product overview Overview of the LED indications of the charging case When a USB cable is connected, the LED of the charging case per- manently displays the charging process: Charging case Charging case WITH WITHOUT earbuds earbuds inserted inserted ... earbuds and pulses ...

  • Page 8: Overview Of The Led Indications Of The Earbuds

    Product overview Charging case Charging case WITH WITHOUT earbuds earbuds inserted inserted ... earbuds are fully charged and the lights up ... charging case is charging case can green fully charged still charge at least one complete cycle ... earbuds are being charged via the pulses rechargeable bat-...

  • Page 9: Notes On Voice Prompts

    Product overview Meaning; the earbuds... flashes red-blue for approx. 1 ... are in Bluetooth pairing mode minute ... Bluetooth pairing or earbud pair- flashes blue 3x ing successful ... Bluetooth pairing or earbud pair- flashes red 3x ing failed ... are connected to a device via Bluetooth lights up blue (master earbud (R) is connected to...
  • Page 10 Product overview Voice prompt Meaning/earbuds... “Call rejected” ... incoming call rejected “Call ended” ... call ended “Volume min” ... volume set to minimum “Volume max” ... volume set to maximum 10 | CX 400BT True Wireless...

  • Page 11: Getting Started

    Getting started Getting started 1. Waking up the earbuds and the charging case and charging the rechargeable batteries USB-C USB-A Upon delivery, the rechargeable batteries of the earbuds and the charging case are in sleep mode and have to be woken up by con- necting them to a power source once.
  • Page 12 4. Installing the Smart Control app on your smartphone “Sennheiser Smart Control” The Sennheiser Smart Control app allows you to use all functions and settings of the earphones and to e.g. adjust the sound to your liking using the equalizer (> 19).

  • Page 13: Using The Earphones

    1.5 hours. The quick charge function gives you approx. 1 hour of playback time after 15 minutes of charging. Sennheiser recommends using the supplied USB cable and a com- patible standard USB power supply for charging the headphones.

  • Page 14: Charging The Rechargeable Battery Of The Earbuds And The Charging Case

    Using the earphones Charging the rechargeable battery of the earbuds and the charging case USB-C USB-A 1. Open the charging case by overcoming a slight magnetic resis- tance and insert the left earbud into the left charging compart- ment and the right earbud into the right charging compartment. The earbuds are magnetically pulled into the charging compart- ments.

  • Page 15: Connecting The Earphones To A Bluetooth Device

    Using the earphones Connecting the earphones to a Bluetooth device To be able to use the Bluetooth wireless connection, you must regis- ter both devices (earphones and e.g. smartphone) via the device set- tings of your smartphone. 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.

  • Page 16: Pairing The Earphones With A Bluetooth Device

    Using the earphones The right and the left earbud also use a Bluetooth wireless con- nection. Both earbuds are paired with each other upon delivery. If you are using a different earbud (e.g. a spare earbud), the two earbuds must also be paired with each other (> 31). Pairing the earphones with a Bluetooth device “Pairing“...
  • Page 17 Using the earphones 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 (> 19). ▷ In the Smart Control app, tap “Connections”. The list of Bluetooth devices paired with the earphones appears.
  • Page 18 Using the earphones 4. Simultaneously touch and hold the right and the left touch control panel for 10 seconds until you hear the voice prompt “Pairing” and a beep. The LEDs of the earbuds flash green and red. The earbuds are in earbud pairing mode.

  • Page 19: Installing The Smart Control App

    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 App Store or Google Play and install it on your smartphone.

  • Page 20: Selecting Suitable Ear Adapters For Optimum Fit Of The Earbuds

    Using the earphones Selecting suitable ear adapters for optimum fit of the earbuds Click The perceived sound quality including bass performance and the best possible noise cancellation of the earphones depends to a large extent on the correct fit of the earbuds in the ear. ▷...

  • Page 21: Switching The Earphones On

    Using the earphones Switching the earphones on WARNING Danger of hearing damage 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 (> 22). ▷...

  • Page 22: Adjusting The Volume

    Using the earphones ▷ Insert the earbuds into the charging case to switch them off. As soon as the earbuds are inserted into the charging case, they switch off and are being charged (> 14). You can also switch off the earbuds manually (idle mode) via the Smart Control app.

  • Page 23: Using The Voice Assistant/Voice Dialing

    Using the earphones Using the voice assistant/voice dialing ▷ Tap the touch control panel of the right earbud 1x. The available voice assistant of your smartphone is activated (*depending on the system or app on your smartphone: Siri, Goo- gle Assistant, ...). ▷...

  • Page 24: Making Calls Using The Earphones

    Using the earphones Left touch control panel Function Tap 2x Plays the previous track in the playlist Playing the next track ▷ Tap the touch control panel of the right earbud 2x. Right touch control panel Function Tap 2x Plays the next track in the playlist Making calls using the earphones The call functions are only available when the earphones and the smartphone are connected via Bluetooth.
  • Page 25 Using the earphones Right or left touch control Function panel Tap 1x Accepts a call Tap 1x Ends a call Voice prompt “Call ended” Tap 2x Rejects a call Voice prompt “Call rejected” Tap 1x Accepts an incoming call and ends the active call Tap 2x Rejects an incoming call and contin-...
  • Page 26 Using the earphones Charging case Charging case WITH WITHOUT earbuds earbuds inserted inserted ... earbuds are fully charged and the lights up ... charging case is charging case can green fully charged still charge at least one complete cycle ... earbuds are being charged via the pulses rechargeable bat-...
  • Page 27 Using the earphones Adjusting sound effects/the equalizer To be able to use the sound effects/equalizer, you require the Smart Control app (> 19). ▷ In the Smart Control app, select the desired sound effects via the equalizer. You can use predefined presets or define your own set- tings.

  • Page 28: Storing Or Transporting The Earphones In The Charging Case

    Using the earphones Storing or transporting the earphones in the charging case Store the earphones in the charging case to prevent damage to the earphones when you are not using or transporting them. The ear- phones are automatically charged in the charging case so you always have the full battery life to work with.
  • Page 29 Replacing the ear adapters For reasons of hygiene, you should replace your ear adapters from time to time. Spare ear adapters are available from your Sennheiser partner. 1. Pull the ear adapter away from the in-ear sound tunnel.

  • Page 30: Information On The Built-In Rechargeable Battery

    (> 7), stop using the product, disconnect it from the power supply system and immediately return the product to any Sennheiser service partner. Installing firmware updates Firmware updates can be downloaded free of charge from the Inter- net using the Sennheiser Smart Control app.
  • Page 31 If a problem occurs that is not listed in the FAQ section or if the prob- lem cannot be solved with the proposed solutions, please contact your Sennheiser partner for assistance. To find a Sennheiser partner in your country, search at www.sennheiser.com > “Service & Support”. Leaving the Bluetooth transmission range Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone.
  • Page 32 FAQ/If a problem occurs ... You can also reset the earphones to the factory default settings using the Smart Control app. 32 | CX 400BT True Wireless...

  • Page 33: Specifications

    Specifications Specifications CX 400BT True Wireless Model: CX400TW1, CX400TW1 C, CX400TW1 L, CX400TW1 R Wearing style true wireless stereo earphones Ear coupling ear-canal, closed-back Frequency response 5 Hz to 21 kHz Transducer principle dynamic Transducer size 7 mm Sound pressure level (SPL) 114 dB (1 kHz/0 dBFS) THD (1 kHz, 94 dB SPL) <...
  • Page 34 Specifications Device name CX 400BT TW LE-CX 400BT TW (Bluetooth Low Energy only) Number of active connections 34 | CX 400BT True Wireless...

  • Page 35: Manufacturer Declarations

    Manufacturer Declarations Manufacturer Declarations Warranty Sennheiser electronic GmbH & Co. KG gives a warranty of 24 months on this product. For the current warranty conditions, please visit our website at www.sennheiser.com or contact your Sennheiser partner. In compliance with the following requirements •...
  • Page 36 Manufacturer Declarations aptX is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries, used with per- mission. Other product and company names mentioned in the user documen- tation may be the trademarks or registered trademarks of their respective holders.

This manual is also suitable for:

Cx400tw1Cx400tw1 rCx400tw1 lCx400tw1 c

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