CX Plus True Wireless
CX Plus SE True Wireless
CX 500BT True Wireless
True Wireless stereo earbuds
Model: CXPLUSTW1, CXPLUSTW1 R, CXPLUSTW1 L, CXPLUSTW1 C
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview”
“Getting started”
“Using the earbuds”
“FAQ/If a problem occurs ...”
“Specifications”
Sonova Consumer Hearing GmbH
Am Labor 1
30900 Wedemark
Germany
www.sennheiser-hearing.com
Version: 06/22 A02
Important safety instructions
2 | CX Plus True Wireless
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. Head
-
phones of the Sennheiser brand sound exceptionally good even at
low and medium volume levels.
▷ Do not insert the earphones too deep into your ears and never
insert them without ear adapters. Always remove the earphones
slowly and carefully from your ears.
▷ The product generates stronger permanent magnetic
fields that could cause interference with cardiac pace
-
makers, implanted defibrillators (ICDs) and other
implants. Always maintain a distance of at least 3.94"/10 cm
between the product component containing the magnet (earbuds
and charging case) 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 chok
-
ing hazard.
▷ Do not use the product in an environment that requires your spe-
cial attention (e.g. in traffic). Especially the product’s active noise
cancellation can make ambient noise 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 tem-
peratures (hairdryer, heater, extended exposure to sunlight, etc.)
to avoid corrosion or deformation. The normal operating tempera
-
ture is from 0 °C to 40 °C/32 °F to 104 °F.
▷ 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 earbuds.
▷ Use only attachments/accessories/spare parts supplied or rec-
ommended by Sonova Consumer Hearing.
▷ Clean the product only with a soft, dry cloth.
Important safety instructions
CX Plus True Wireless | 3
Safety instructions for lithium-ion rechargeable batteries
Notes on the ingress protection rating of the earbuds
The earbuds feature an IPX4 ingress protection rating which means
they are protected from the ingress of water (protection class
according to International Protection Marking (IP code), IEC standard
60529, tested under laboratory conditions).
The earbuds can be used in the rain, for example. However, they are
not suitable for immersion in water or for wearing in the shower. In
case of permanent moisture/wetness, the ingress protection can be
reduced and the product can be damaged.
Do not charge wet earbuds. Completely dry wet earbuds with a dry
cloth before charging them.
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 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/41 °F
and 95 °F and do not charge them near easily flammable
objects.
Do not heat the product / rechargeable batteries above
70 °C/158
°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).
This product contains coin rechargeable batteries. If you
think the product / a coin rechargeable battery has been
swallowed or is lodged in the body, seek medical
assistance immediately.
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.
Important safety instructions
4 | CX Plus True Wireless
The charging case is not splash waterproof. Always keep the
charging case dry.
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 trans
-
ferred to Sonova Consumer Hearing GmbH or companies commis-
sioned by Sonova Consumer Hearing GmbH and is not processed.
Using the “Sennheiser Smart Control” app, you can update the firm-
ware of the product for free via an Internet connection. If the device
on which the app is installed is connected to the Internet, the follow
-
ing data is automatically transferred to and processed by Sonova
Consumer Hearing GmbH 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.
Intended use/Liability
These headphones have been designed as an accessory for Blue-
tooth compliant devices. They are intended for wireless audio com-
munication such as music playback and phone calls via Bluetooth
wireless technology.
It is considered improper use when the product is used for any appli-
cation not named in the corresponding product documentation.
Sonova Consumer Hearing GmbH does not accept liability for
damage arising from misuse or improper use of the 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 bat
-
teries or exceeding the Bluetooth transmission range.
Before putting the product into operation, please observe the
respective country-specific regulations.
Package contents
CX Plus True Wireless | 5
Package contents
Online you can find:
• this detailed instruction manual and additional information
(
www.sennheiser-hearing.com/download)
• the Sennheiser Smart Control app for configuring the head-
phones and for additional functions
(www.sennheiser-hearing.com/smartcontrol)
Earbud R for right ear (model: CXPLUSTW1 R) and
earbud L for left ear (model: CXPLUSTW1 L)
Charging case (model: CXPLUSTW1 C) with built-in
rechargeable battery for the earbuds
USB charging cable with USB-C and USB-A connec-
tor, length approx. 0.25 m
Silicone ear adapters (size XS, S, M (pre-mounted to
the earbuds) and L)
Quick guide
Safety guide
A list of accessories can be found on the CX Plus True Wireless
product page at
www.sennheiser-hearing.com.
Contact your local Sonova Consumer Hearing partner:
www.sennheiser-hearing.com/service-support.
Product overview
6 | CX Plus True Wireless
Product overview
Charging case
Model: CXPLUSTW1 C
LED
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
Built-in rechargeable battery for charging the earbuds on
the go
Type plate
Charging compartment for the left earbud L
Magnetic holders
Charging compartment for the right earbud R
Charging contacts
1
6
7
5
6
6
234
8
Product overview
CX Plus True Wireless | 7
Earbuds
Model: CXPLUSTW1 R and CXPLUSTW1 L
Touch control panel
Changeable silicone ear adapters
Left earbud L
Status LED
Infra-red carrying senor
Magnetic holders
Charging contacts
Microphones for the active noise cancellation ANC, for the
perception of ambient noise (“Transparency Mode”) and
for phone calls
Right earbud R
Built-in rechargeable battery
C
C
D
A
CXPLUSTW1 RCXPLUSTW1 L
A
E
E
F
0
0
H
B
E
E
F
I I
D
G
G
Product overview
8 | CX Plus True Wireless
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:
If you open the lid of the charging case and no USB cable is con-
nected, the LED of the charging case displays the battery charge
status or the charging process of the earbuds. If you close the lid of
the charging case, the LED will go off after 5 seconds.
LED
Charging case WITH
earbuds inserted
Charging case
WITHOUT earbuds
inserted
pulses
yellow
... earbuds and
charging case are
being charged
... charging case is
being charged
lights up
green
... earbuds and
charging case are
fully charged
... charging case is
fully charged
flashes
red
... a charging error/
battery error has
been detected in at
least one earbud (>
33)
... a charging error/
battery error has
been detected in the
charging case (>
33)
5s
Product overview
CX Plus True Wireless | 9
Overview of the LED indications of the
earbuds
LED
Charging case WITH
earbuds inserted
Charging case
WITHOUT earbuds
inserted
lights up
green
... earbuds are fully
charged and the
charging case can
still charge at least
one complete cycle
... charging case is
fully charged
pulses
yellow
... earbuds are being
charged via the
rechargeable bat
-
tery of the charging
case
–
lights up
yellow
... earbuds are fully
charged, the
charging case
cannot charge
another complete
cycle
... charging case is
charged less than
50
%
lights up
red
... rechargeable bat-
teries of the earbuds
and the charging
case are empty
... rechargeable bat-
tery of the charging
case is empty
flashes
red
... a charging error/
battery error has
been detected in at
least one earbud (>
33)
... a charging error/
battery error has
been detected in the
charging case (>
33)
If the LED does not light up:
• Clean the contacts on the earbuds and in the charging case
(>
32).
• Charge the rechargeable batteries of the earbuds and the
charging case until the LED lights up again (>
14).
Product overview
10 | CX Plus True Wireless
Notes on voice prompts
The earbuds output voice prompts for events (the table gives some
examples). Using the Smart Control app, you can change the lan
-
guage of the voice prompts, choose between voice prompts and
beep sounds, or deactivate the status messages with a few excep
-
tions (e.g. rechargeable battery is empty).
LED Meaning; the earbuds...
flashes red-blue
for approx.
1
minute
... are in Bluetooth pairing mode
flashes blue 3x
... Bluetooth pairing or earbud pair-
ing successful
flashes red 3x
... Bluetooth pairing or earbud pair-
ing failed
lights up blue
... are connected to a device via
Bluetooth
lights up red
... are not connected to a device via
Bluetooth or the connection has
been lost
flashes red
quickly
... rechargeable battery is almost
empty
flashes red
slowly
... system error – perform a reset (>
34)
flashes red-
green for
approx. 1 minute
... are in earbud pairing mode (to pair
the right and left earbud)
When you insert the earbuds into your ears, the LEDs of the
earbuds automatically go off.
3x
3x
Voice prompt Meaning/earbuds...
“Power on” ... are switched on
“Power off” ... switch off
“Connected” ... connected via Bluetooth
“No connection” ... not connected via Bluetooth
“Pairing” ... in Bluetooth pairing mode
“Pairing cancelled” ... Bluetooth pairing cancelled
“Pairing successful” ... Bluetooth pairing successful
“Pairing failed” ... Bluetooth pairing not successful
“Recharge headset” ... Rechargeable battery is almost
empty. Recharge the rechargeable
battery.
“Call rejected” ... incoming call rejected
“Call ended” ... call ended
“Volume min” ... volume set to minimum
“Volume max” ... volume set to maximum
Getting started
CX Plus True Wireless | 11
Getting started
1. Waking up the earbuds and the charging case
and charging the rechargeable batteries
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.
▷ Insert the earbuds into the charging case.
▷ Connect the USB-C cable to the charging case and to a USB
power source (>
14).
The earbuds and the charging case are woken up and the
rechargeable batteries are being charged. The earbuds are now
ready for use.
2. Selecting suitable ear adapters for optimum
fit of the earbuds
The perceived sound quality including bass performance and the
best possible noise cancellation depend to a large extent on the cor
-
rect fit of the earbuds in the ear.
▷ Test which ear adapter size gives you the best sound quality and
the best wearing comfort.
▷ You can choose between 4 different ear adapters in size XS, S, M
and L (>
20).
L
R
USB-A
USB-C
L
M
S
XS
Getting started
12 | CX Plus True Wireless
▷ Assign the right earbud to your right ear and the left earbud to
your left ear.
▷ Insert the earbuds at a slight angle into the ears and twist them
slightly into the ear canal so that they sit comfortably and snugly
in the ear canal.
3. Connecting the earbuds to a Bluetooth device
Connect the earbuds to your smartphone via Bluetooth (> 16).
4. Installing the Smart Control app on your
smartphone
The Sennheiser Smart Control app allows you to use all functions
and settings of the headphones and to e.g. adjust the sound to your
liking using the equalizer (>
19).
RightLeft
L
R
3s
L
R
“Pairing“
Smart Control
“Sennheiser Smart Control”
Using the earbuds
CX Plus True Wireless | 13
Using the earbuds
Information on the rechargeable battery,
the charging process and the first use
The earbuds and the charging case each have a built-in rechargeable
battery. The charging case allows you to store the earbuds safely at
all times while they are being charged.
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. Sonova Consumer Hearing
recommends charging the earbuds and the charging case for a com
-
plete charging cycle without interruption before using for the first
time.
A complete charging cycle of the charging case and the earbuds
takes about 1.5 hours. The quick charge function gives you approx.
1
hour of playback time after 10 minutes of charging.
Sonova Consumer Hearing recommends using the supplied USB
cable and a compatible standard USB power supply for charging the
headphones.
When a USB cable connected to a power source is also connected to
the charging case, the rechargeable battery of the charging case is
being charged. When the earbuds are inserted into the charging
case, their rechargeable batteries are being charged at the same
time. The LED of the charging case displays the charge status (>
8).
When the battery charge of the earbuds drops to a critical level, a
voice prompt asks you to recharge the earbuds (“Recharge head
-
set”).
The charge status of the rechargeable battery of the charging case
is displayed by the LED on the charging case (>
8).
Rechargeable
battery
Operating time with fully charged
rechargeable batteries
Earbuds
approx. 8 hrs (test conditions: iPhone within 1
m distance, Bluetooth AAC codec, playback of
mixed music, volume level 50
%, no EQ set-
tings)
Earbuds and
charging case
approx. 24 hrs (up to 2 additional charging
cycles of the earbuds via the charging case)
Using the earbuds
14 | CX Plus True Wireless
Charging the rechargeable battery of the
earbuds and the charging case
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.
2. Connect the USB-C connector of the USB cable to the USB-C
socket of the charging case.
3. Connect the USB-A connector to a corresponding socket of a USB
power source (to be ordered separately). Make sure that the USB
power source is connected to the power supply system.
The rechargeable batteries of the earbuds and the charging case
are being charged.
If no earbuds are inserted into the charging case, only the
rechargeable battery of the charging case is being charged.
The LED of the charging case displays the charge status:
LED
Charging case WITH
earbuds inserted
Charging case
WITHOUT earbuds
inserted
pulses
yellow
... earbuds and
charging case are
being charged
... charging case is
being charged
lights up
green
... earbuds and
charging case are
fully charged
... charging case is
fully charged
flashes
red
... a charging error/
battery error has
been detected in at
least one earbud (>
33)
... a charging error/
battery error has
been detected in the
charging case (>
33)
If the LED does not light up:
• Clean the contacts on the earbuds and in the charging case
(>
32).
• Charge the rechargeable batteries of the earbuds and the
charging case (at least 30 minutes) until the LED lights up
again.
1 2
3
L
R
USB-A
USB-C
Using the earbuds
CX Plus True Wireless | 15
Connecting the earbuds to a Bluetooth
device
To be able to use the Bluetooth wireless connection, you must regis-
ter both devices (earbuds 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.
Information on the Bluetooth wireless
connection
The earbuds are compatible 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®, aptX adaptive® or AAC. Otherwise the headphones
will play your music in normal audio quality (SBC).
Paired devices establish the Bluetooth wireless connection immedi-
ately after switch-on and are ready for use.
When you switch the earbuds on, they automatically try to connect
to the last connected Bluetooth device. The earbuds 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 earbuds with the seventh Bluetooth device, the saved
connection profile of the least used Bluetooth device will be over
-
written. If you want to re-establish a connection with the overwritten
Bluetooth device, you have to pair the earbuds again.
Using the Smart Control app, you can view the list of paired devices
and selectively connect and disconnect devices (“Connections”; >
17).
When you switch on the earbuds for the first time after initial
charging, they automatically switch to Bluetooth pairing mode.
1
2
3
4
5
6
Using the earbuds
16 | CX Plus True Wireless
Pairing the earbuds with a Bluetooth
device
1. Take both earbuds out of the charging case and insert them into
your ears (>
20). The distance between the earbuds and the Blue-
tooth device should not exceed 40"/1 m.
2. Simultaneously touch and hold the right and the left touch control
panel for 3 seconds until you hear the voice prompt “Pairing” and
a beep.
The LEDs of the earbuds flash blue and red. The earbuds are in
pairing mode.
3. Activate Bluetooth on your Bluetooth device.
4. Via the menu of your Bluetooth device, start the search for new
Bluetooth devices.
All active Bluetooth devices in the proximity of your smartphone
are displayed.
From the list of found Bluetooth devices, select “CX True Wire-
less”. If necessary, enter the default pin code “0000”.
If pairing was successful, you hear the voice prompt “Pairing suc-
cessful” and the LEDs of the earbuds flash blue 3x.
Paired and connected Bluetooth device
Paired Bluetooth device (currently not connected)
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 (>
34).
max. 1 m/40 inch
ON
1
3 4
2
3x
CX Plus True Wireless
************
“Pairing
successful“
3s
L
R
“Pairing“
Using the earbuds
CX Plus True Wireless | 17
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 earbuds appears.
▷ From the list, select the paired device to which you want to con-
nect the earbuds. Make sure that the desired device is switched
on and Bluetooth is activated.
The Bluetooth audio connection between the desired Bluetooth
device and the earbuds is established.
The app connection between the device with the Smart Control
app installed and the earbuds remains active (only Bluetooth Low
Energy for communication between app and earbuds, the device
name is highlighted in bold).
Disconnecting the earbuds from a
Bluetooth device
▷ Via the menu of your Bluetooth device, disconnect the connection
to the earbuds.
The earbuds are disconnected from the Bluetooth device. The
earbuds then search for other paired devices. If no device is
found, you hear the voice prompt “No connection”. The head
-
phones switch to idle mode.
Pairing a spare earbud
The right and the left earbud are paired with each other upon deliv-
ery. If, however, you are using a different earbud (e.g. a spare ear-
bud), you have to pair the two earbuds with each other once. This
pairing process resets the earbuds to the factory default settings.
1. Insert both earbuds into the charging case and leave the lid of the
charging case open.
If no connection is established within 1 minute, pairing mode is
terminated and the earbuds switch to idle mode. If necessary,
repeat the steps described above.
If the earbuds are not paired with any Bluetooth device (the
pairing list is empty), pairing mode is permanently active.
Using the “Connections” function in the Smart Control app, you
can also selectively connect the earbuds to paired devices
without terminating an existing connection (>
34).
If you want to clear the Bluetooth pairing list of the earbuds,
reset the earbuds to the factory default settings (>
34).
Using the earbuds
18 | CX Plus True Wireless
2. After 20 seconds, the earbuds are paired with each other.
The LED on the charging case then lights up red and green 3x.
The earbuds are now paired with each other.
If you have closed the lid of the charging case too early, repeat
the above procedure.
After the pairing process with a spare earbud, all settings are
reset. Pair the earbuds with your smartphone again (>
16).
1 2
20s
Connected
L
R
3 x
Keep open
Using the earbuds
CX Plus True Wireless | 19
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 smart
-
phone to scan the following QR code or to call up the following Inter-
net site:
www.sennheiser-hearing.com/smartcontrol
▷ Connect your smartphone to the earbuds using Bluetooth (> 15).
▷ Start the Smart Control app.
▷ Follow the instructions in the app.
Smart Control
“Sennheiser Smart Control”
Using the earbuds
20 | CX Plus True Wireless
Selecting suitable ear adapters for
optimum fit of the earbuds
The perceived sound quality including bass performance and the
best possible noise cancellation depends to a large extent on the
correct fit of the earbuds in the ear.
▷ Pull the ear adapter away from the in-ear sound tunnel.
▷ Mount the new ear adapter to the in-ear sound tunnel. Ensure that
it locks into place.
▷ Test which ear adapter size gives you the best sound quality and
the best wearing comfort.
You can choose between 4 different ear adapters in size XS, S, M
and L. The ear adapters must fit snugly in the ear canal and com
-
pletely seal your ears.
Inserting the earbuds into the ears
▷ Assign the right earbud to your right ear and the left earbud to
your left ear.
▷ Insert the earbuds at a slight angle into the ears and twist them
slightly into the ear canal so that they sit comfortably and snugly
in the ear canal (>
20).
LMSXS
Click
The right or left earbud can be used alone. If you insert one
earbud into the charging case during use, a short interruption
of playback may occur in the other earbud.
RightLeft
L
R
Using the earbuds
CX Plus True Wireless | 21
Switching the earbuds on
▷ Take both earbuds out of the charging case and insert them into
your ears (>
20).
If a paired Bluetooth device is within the transmission range, you
hear the voice prompts “Power On” and “Connected”. The LEDs
of the earbuds light up blue.
The Smart Pause function automatically stops music playback
if you remove an earbud from your ear (>
25).
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).
▷ Do not continuously expose yourself to high volume
levels.
If you take the earbuds out of the charging case during an
incoming call, the call is automatically accepted and you can
use the earbuds directly for making calls.
This Auto Call function can also be deactivated (> 28).
The earbuds automatically switch to idle mode if no paired
Bluetooth device can be found within 15 minutes. You can also
change this setting via the Smart Control app. You can wake up
the earbuds from idle mode by touching their touch control
panels 1x or by briefly inserting them into the charging case.
“Connected“
L
R
“Power On“
Using the earbuds
22 | CX Plus True Wireless
Switching the earbuds off
The earbuds do not have to be switched off explicitly.
▷ 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).
Adjusting the volume
To increase the volume:
▷ Touch and hold the touch control panel of the right earbud until
the volume is increased.
To reduce the volume:
▷ Touch and hold the touch control panel of the left earbud until the
volume is reduced.
When the maximum or minimum volume is reached, you hear the
voice prompt “Volume max” or “Volume min”.
The earbuds automatically switch to idle mode if no paired
Bluetooth device can be found within 15 minutes. You can wake
up the earbuds from idle mode by touching their touch control
panels 1x or by briefly inserting them into the charging case.
L
R
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 and before toggling
between audio sources, adjust the volume to a low
level.
▷ Do not continuously expose yourself to high volume
levels.
R
L
Hold Hold
Using the earbuds
CX Plus True Wireless | 23
Information on active noise cancellation
ANC
Due to the wearing style in the ear canal, the earbuds provide effec-
tive passive isolation from ambient noise.
In addition, the earbuds have an active noise cancellation (ANC)
function, which allows you to reduce ambient noise to a minimum.
This feed forward system with one microphone per earbud is espe
-
cially effective at reducing low-frequency noise. A possible feeling of
pressure on the ears and the slight ANC noise (in very quiet environ
-
ments) is avoided with this system.
Even when ANC is activated, your headphones’ sound quality is
always at its best.
If you want to create a quiet space in a noisy environment, you can
simply use the earbuds as noise protection by using ANC.
Notes on active noise cancellation
• Continuous low-frequency noise, such as motor or fan noise, is
particularly well suppressed.
• Speech or high-frequency noise is significantly reduced, but can
remain perceptible.
• If unusual (whistling or beeping) noise occurs, take the head-
phones off and put them on again. Make sure that the earbuds
properly fit in your ears and make a good seal with the ear canal.
• 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.
• With active noise cancellation ANC activated, the battery life of
the earbuds is reduced.
Activating/deactivating the active noise
cancellation ANC
▷ Tap the touch control panel of the left earbud 3x.
The active noise cancellation ANC is activated or deactivated.
You can also adjust the volume using the connected Bluetooth
device.
ON/OFF
3 x L
Using the earbuds
24 | CX Plus True Wireless
Listening to ambient sounds or
conversations - activating/deactivating
the Transparency Mode function
With Transparency Mode activated, you can hear ambient sounds or
communicate without having to remove the earbuds from your ears.
This allows you to hear e.g. announcements in the train or aircraft or
to have short conversations.
▷ Tap the touch control panel of the left earbud 1x.
The Transparency Mode set in the Smart Control app is activated.
You can hear ambient sounds without having to remove the ear
-
buds from your ears.
To deactivate the Transparency Mode function:
▷ Tap the touch control panel of the left earbud 1x.
Adjusting the Transparency Mode
function
To be able to fully use Transparency Mode, you require the Smart
Control app (>
19).
▷ Select the desired Transparency Mode function in the Smart Con-
trol app:
*: default setting
You can also activate or deactivate the active noise cancella-
tion ANC via the Smart Control app.
ON/OFF
1 x L
Transparency Mode Description
“Keep music playing and
mix with ambient sound”
Audio playback (e.g. music) continues
and is mixed with ambient sounds.
“No music playback, only
ambient sound”*
Audio playback (e.g. music) is muted
and you hear only ambient sounds.
Using the earbuds
CX Plus True Wireless | 25
Using the voice assistant/voice dialing
▷ Tap the touch control panel of the right earbud 3x.
The available voice assistant of your smartphone is activated
(*depending on the system or app on your smartphone: Siri, Goo
-
gle Assistant, ...).
▷ Ask the voice assistant your question or make a request.
To cancel the voice assistant/voice dialing:
▷ Tap the touch control panel of the right earbud 3x.
Using the Smart Pause function
The earbuds automatically detect whether they are worn in the ear
or removed from the ear.
Music playback pauses when you remove an earbud from your ear
and resumes when you insert it again (if you interrupt for more than
2 minutes, playback will not start automatically).
You can activate (default setting) or deactivate the function via the
Smart Control app.
Controlling music playback
The music playback functions are only available when the earbuds
and the device are connected via Bluetooth. Some smartphones or
music players may not support all functions.
Right touch control panel Function
Tap 3x
Activates the voice assistant
ON/OFF
3 x
1 x
Using the earbuds
26 | CX Plus True Wireless
Playing/pausing music
▷ Tap the touch control panel of the right earbud 1x.
Playing the previous track
▷ Tap the touch control panel of the left earbud 2x.
Playing the next track
▷ Tap the touch control panel of the right earbud 2x.
Right touch control panel Function
Tap 1x Plays or pauses music
Left touch control panel Function
Tap 2x Plays the previous track in the playlist
Right touch control panel Function
Tap 2x Plays the next track in the playlist
L
2 x
R
2 x
Using the earbuds
CX Plus True Wireless | 27
Making calls using the earbuds
The call functions are only available when the earbuds and the
smartphone are connected via Bluetooth.
Some smartphones and telephony apps (e.g. WhatsApp, Skype,
WeChat) may not support all call control functions.
During a call, you can use the right and/or left earbud to control the
call functions.
Making a call
▷ Dial the desired number on your smartphone.
If your smartphone does not automatically transfer the call to the
headphones, select “CX Plus True Wireless” as the audio source
on your smartphone (see the instruction manual of your smart
-
phone 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.
Right or left touch control
panel
Function
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-
ues the active call
Using the earbuds
28 | CX Plus True Wireless
Using the Auto Call function
If you take the paired earbuds out of the charging case during an
incoming call, the call is automatically accepted and you can use the
earbuds directly for making calls.
You can activate (default setting) or deactivate the function via the
Smart Control app. Note that both earbuds must be switched on to
adjust the settings for both earbuds (right and left).
Using the Sidetone function
When using the earbuds for phone calls, you may find it more com-
fortable if your own voice is audible in the earbuds. With the
Sidetone function activated, your own voice is played back through
the earbuds during a phone call.
You can activate the function (default setting) and adjust settings or
deactivate the function via the Smart Control app. Note that both
earbuds must be switched on to adjust the settings for both earbuds
(right and left).
Displaying the battery charge status
When the earbuds are connected to your Bluetooth device, the bat-
tery charge status can be displayed on the screen of your smart-
phone or device (depending on the device and operating system
used).
The Smart Control app also displays the charge status of the ear-
buds’ rechargeable batteries.
Displaying the battery charge status using the charging case
If no USB cable is connected to the charging case:
▷ Open the lid of the charging case.
The LED of the charging case displays the battery charge status.
If you close the lid of the charging case, the LED will go off after
5 seconds.
The right or left earbud can be used alone. If you insert one
earbud into the charging case during use, a short interruption
of playback may occur in the other earbud.
5s
Using the earbuds
CX Plus True Wireless | 29
LED
Charging case WITH
earbuds inserted
Charging case
WITHOUT earbuds
inserted
lights up
green
... earbuds are fully
charged and the
charging case can
still charge at least
one complete cycle
... charging case is
fully charged
pulses
yellow
... earbuds are being
charged via the
rechargeable bat
-
tery of the charging
case
–
lights up
yellow
... earbuds are fully
charged, the
charging case
cannot charge
another complete
cycle
... charging case is
charged less than
90
%
lights up
red
... rechargeable bat-
teries of the earbuds
and the charging
case are empty
... rechargeable bat-
tery of the charging
case is empty
flashes
red
... a charging error/
battery error has
been detected in at
least one earbud (>
33)
... a charging error/
battery error has
been detected in the
charging case (>
33)
Using the earbuds
30 | CX Plus True Wireless
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.
The sound effects are stored in the earbuds. These sound set-
tings are active even without using the Smart Control app, i.e.
when you are using a different Bluetooth device. Note that both
earbuds must be switched on to adjust the settings for both ear
-
buds (right and left).
Setting the voice prompts/beep sounds
To be able to set the voice prompts and beep sounds, you require the
Smart Control app (>
19).
You can change the language of the voice prompts, choose between
voice prompts and beep sounds, or deactivate the status messages
with a few exceptions (e.g. rechargeable battery is empty). Note that
both earbuds must be switched on to adjust the settings for both
earbuds (right and left).
Customizing the control functions
To be able to customize the control functions for music playback, you
require the Smart Control app (>
19).
The app allows you to customize the control functions and other
commands or to select preset control functions. Some basic func
-
tions cannot be changed (e.g. call control).
Using the earbuds
CX Plus True Wireless | 31
Storing or transporting the earbuds in the
charging case
Store the earbuds in the charging case to prevent damage to the ear-
buds when you are not using them or transporting them. The earbuds
are automatically charged in the charging case so you always have
the full battery life to work with.
▷ Open the lid of the charging case by overcoming a slight magnetic
resistance and insert the left earbud into the left charging com
-
partment and the right earbud into the right charging compart-
ment.
The earbuds are magnetically pulled into the charging compart-
ments.
▷ Close the lid of the charging case.
L
R
Care and maintenance of the earbuds/charging case
32 | CX Plus True Wireless
Care and maintenance of the
earbuds/charging case
▷ Only clean the charging case with a soft, dry cloth.
▷ Clean the earbuds with a slightly damp cloth.
▷ You can clean the silicone ear adapters under lukewarm running
water. Let the ear adapters air dry at room temperature for at
least 12 hours before re-attaching them to the earbuds.
▷ Clean the charging contacts on the earbuds and in the charging
case from time to time using e.g. a cotton swab.
If the earbuds have gotten wet:
▷ Remove the ear adapters and dry the earbuds and ear adapters
with a dry cloth. If necessary, leave the earbuds and ear adapters
dry at room temperature for approx. 12 hours.
Replacing the ear adapters
For reasons of hygiene, you should replace your ear adapters from
time to time. Spare ear pads are available from your Sonova Con
-
sumer Hearing partner.
1. Pull the ear adapter away from the in-ear sound tunnel.
2. Mount the new ear adapter to the in-ear sound tunnel. Ensure that
it locks into place.
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.
▷ Keep all liquids far away from the product.
▷ Do not use any solvents or cleansing agents.
Care and maintenance of the earbuds/charging case
CX Plus True Wireless | 33
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 sus
-
pect that a rechargeable battery is obviously defective or if a
charging error/battery error is displayed (>
8), stop using the prod-
uct, 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
Installing firmware updates
Firmware updates can be downloaded free of charge from the Inter-
net using the Sennheiser Smart Control app.
▷ Before updating, the earbuds must be removed from the charging
case and must not be placed back into the charging case during
the update.
▷ Connect your earbuds to your smartphone and start the Smart
Control app (>
19).
▷ The app provides information on available firmware updates and
guides you through the installation process.
▷ Make sure that the batteries are fully charged before updating (>
14). Avoid connecting or disconnecting the USB power supply
during the update process.
Click
LMSXS
FAQ/If a problem occurs ...
34 | CX Plus True Wireless
FAQ/If a problem occurs ...
Current list of frequently asked questions (FAQ)
Visit the CX Plus True Wireless product page at
www.sennheiser-hearing.com
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 prob-
lem 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 earbuds, leave the Bluetooth transmission
range of the smartphone, the sound quality deteriorates increasingly
until you hear the voice prompt “No connection” and the connection
breaks down completely. If you immediately re-enter the Bluetooth
transmission range, the connection is automatically re-established
and you hear the voice prompt “Connected”. If this is not the case,
tap the touch control panel of the earbud 1x.
Resetting the earbuds
If the function of the earbuds is disturbed, perform a reset. Individual
settings such as the pairing settings are not deleted.
Insert both earbuds into the charging case, close the lid of the
charging case and wait at least 10 seconds before taking the earbuds
out of the charging case and switching them on again.
Resetting the earbuds to the factory default settings
If the function of the earbuds is disturbed and a reset (> 34) does not
improve, reset the earbuds to the factory default settings. This
deletes, among other things, all pairing settings (>
17).
The easiest way to reset the earbuds to the factory default settings
is using the Smart Control app.
Alternatively, you can manually proceed as follows:
1. Deactivate Bluetooth on your smartphone.
The connection between your smartphone and the CX Plus True
Wireless is disconnected.
2. Take one earbud out of the charging case, leave the other earbud
in the charging case.
FAQ/If a problem occurs ...
CX Plus True Wireless | 35
3. Touch and hold the touch control panel of the earbud that is not
in the charging case for 10 seconds.
The LED on this earbud alternately lights up green and red.
4. Now stop touching the touch control panel.
5. Place the earbud back into the charging case. Be sure to leave the
lid of the charging case open when doing so.
After 20 seconds, the earbuds are reset to the factory default set-
tings and automatically reconnect to each other.
After the earbuds have been successfully reset and paired with each
other, the LED of the charging case lights up red and green 3x.
▷ To reconnect your earbuds to your smartphone, reactivate Blue-
tooth on your smartphone.
Pairing a spare earbud with another earbud
The right and the left earbud are paired with each other upon deliv-
ery. If, however, you are using a different earbud (e.g. a spare ear-
bud), you have to pair the two earbuds with each other once. This
pairing process resets the earbuds to the factory default settings.
1. Insert both earbuds into the charging case and leave the lid of the
charging case open.
2. After 20 seconds, the earbuds are paired with each other.
The LED on the charging case then lights up red and green 3x.
The earbuds are now paired with each other.
If you have closed the lid of the charging case too early, repeat
the above procedure.
After the pairing process with a spare earbud, all settings are
reset. Pair the earbuds with your smartphone again (>
16).
OFF
1
3
2
10s
20s
Connected
4 5
Keep open
FAQ/If a problem occurs ...
36 | CX Plus True Wireless
1 2
20s
Connected
L
R
3 x
Keep open
Specifications
CX Plus True Wireless | 37
Specifications
CX Plus True Wireless
CX Plus SE True Wireless
CX 500BT True Wireless
Model: CXPLUSTW1, CXPLUSTW1 C, CXPLUSTW1 L, CXPLUSTW1 R
Wearing style True Wireless stereo earbuds
Ear coupling ear-canal
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) ≤ 0.08 % (1 kHz, 94 dB)
Noise cancellation ANC technology with one pick-up
microphone
Microphone principle MEMS
Microphone frequency
response
100 Hz to 10 kHz
Microphone pick-up pattern
(speech and ANC)
2-microphone beamforming array for
active noise cancellation per earbud
Power supply built-in lithium rechargeable
batteries,
3.7 V
earbuds: 55 mAh
charging case: 400 - 420 mAh
USB charging via USB-C socket of the
charging case: 5 V
, 600 mA
Operating time 8 hrs with rechargeable battery of the
earbud
24 hrs with rechargeable battery of
the charging case
(test conditions: iPhone within 1 m
distance, Bluetooth AAC codec,
volume level 50 %, Transparency
Mode off, ANC off, no EQ settings)
Charging time of
rechargeable batteries
approx. 1.5 hours for full charge
approx. 10 minutes for 1 hour of music
playback
Temperature range operation: 0 to +40 °C
storage: –20 to +60 °C
Relative humidity operation: 10 to 80 %, non condensing
storage: 10 to 90 %
Magnetic field strength earbuds: 0,7 mT
charging case: 39 mT
Ingress protection of the
earbuds
splash proof (IPX4)
Weight earbuds: approx. 6 g each
charging case: approx. 35 g
both earbuds and charging case: 47 g
Specifications
38 | CX Plus True Wireless
Bluetooth
Version Bluetooth 5.2 compatible, class 1
Transmission frequency 2,402 MHz to 2,480 MHz
Modulation GFSK, π/4 DQPSK, 8DPSK
Profiles HFP, AVRCP, A2DP
Output power 10 mW (max)
Codec aptX®, aptX adaptive®, AAC, SBC
Device name CX Plus True Wireless
Manufacturer Declarations
CX Plus True Wireless | 39
Manufacturer Declarations
Warranty
Sonova Consumer Hearing GmbH gives a warranty of 24 months on
this product.
For the current warranty conditions, please visit our website at
www.sennheiser-hearing.com or contact your Sonova Consumer
Hearing partner.
For AUSTRALIA and NEW ZEALAND ONLY
Sonova Hearing Australia Pty Ltd provides a warranty of 24 months
on these products. For the current warranty conditions, visit the
Sonova Consumer Hearing website: www.sennheiser-hearing.com/
warranty.
Sonova Consumer Hearing goods come with guarantees that cannot
be excluded under Australian and New Zealand Consumer law. You
are entitled to a replacement or refund for a major failure and com
-
pensation for any other reasonably foreseeable loss or damage. You
are also entitled to have the goods repaired or replaced if the goods
fail to be of acceptable quality and the failure does not amount to a
major failure. This warranty is in addition to other rights or remedies
under law. Nothing in this warranty excludes, limits or modifies any
remedy available to the consumer which is granted by law.
To make a claim under this contract, raise a case via the Sonova
Consumer Hearing website: www.sennheiser-hearing.com/service-
support.
All expenses of claiming the warranty will be borne by the person
making the claim.
Sonova Consumer Hearing international warranty is provided by:
Sonova Hearing Australia Pty Ltd (ABN 82651492929) The Zenith,
Level 14, Tower A, 821 Pacific Highway, Chatswood New South Wales
2067, Australia.
In compliance with the following requirements
• General Product Safety Directive (2001/95/EC)
•Compliant to Sound Pressure Limits according to country spe-
cific requirements
EU declaration of conformity
• RoHS Directive (2011/65/EU)
Hereby, Sonova Consumer Hearing GmbH declares that the radio
equipment type CXPLUSTW1 (CXPLUSTW1 R, CXPLUSTW1 L,
CXPLUSTW1 C) is in compliance with the Radio Equipment Directive
(2014/53/EU).
The full text of the EU declaration of conformity is available at the fol-
lowing Internet address: www.sennheiser-hearing.com/download.
UK declaration of conformity
• RoHS Regulations (2012)
•Radio Equipment Regulations (2017)
Manufacturer Declarations
40 | CX Plus True Wireless
Notes on disposal
• EU: Battery Directive (2006/66/EC & 2013/56/EU)
• EU: WEEE Directive (2012/19/EU)
• UK: WEEE Regulations (2013)
The symbol of the crossed-out wheeled bin on the product, the bat-
tery/rechargeable battery (if applicable) and/or the packaging indi-
cates 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.
The separate collection of waste electrical and electronic equip-
ment, batteries/rechargeable batteries (if applicable) and packag-
ings is used to promote the reuse and recycling and to prevent neg-
ative effects on your health and the environment, e.g. caused by
potentially hazardous substances contained in these products.
Recycle electrical and electronic equipment and batteries/recharge
-
able batteries at the end of their operational lifetime in order to make
contained recyclable materials usable and to avoid littering the envi
-
ronment.
If batteries/rechargeable batteries can be removed without damag-
ing them, you are obliged to dispose of them separately (for the safe
removal of batteries/rechargeable batteries, see the instruction
manual of the product). Handle lithium-containing batteries/
rechargeable batteries with special care, as they pose particular
risks, such as the risk of fire and/or the risk of ingestion in the case
of coin batteries. Reduce the generation of battery waste as much as
possible by using longer-life batteries or rechargeable batteries.
Further information on the recycling of theses products can be
obtained from your municipal administration, from the municipal col
-
lection points, or from your Sonova Consumer Hearing partner. You
can also return electrical or electronic equipment to distributors who
have a take-back obligation. Herewith you make an important contri
-
bution to the protection of the environment and public health.
Trademarks
Apple, iPhone, 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. The trademark “iPhone” is used in Japan with a
license from Aiphone K.K.
Google Play and the Google Play logo are trademarks of Google LLC.
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 Interna-
tional, Ltd. Qualcomm is a trademark of Qualcomm Incorporated,
registered in the United States and other countries, used with per
-
mission.
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.
Manufacturer Declarations
CX Plus True Wireless | 41
Statements regarding FCC and ISED
This device complies with Part 15 of the FCC rules, RSS-247 of Inno-
vation, Science and Economic Development Canada (ISED). Opera-
tion is subject to the following two conditions: 1) This device may not
cause harmful interference, and 2) This device must accept any
interference received, including interference that may cause unde
-
sired operation.
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or televi
-
sion reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for
help.
Changes or modifications made to this equipment not expressly
approved by the manufacturer may void FCC authorization to oper
-
ate this equipment.
SENNHEISER
Model No:
FCC Supplier's Declaration of Conformity (SDoC)
We,
Sonova Consumer Hearing USA, LLC
One Enterprise Drive • Old Lyme •
CT 06371 • USA
Tel: +1 (860) 598-7800
declare the above device comply with the requirements of Federal Communications Commission.
This device complies with Part 15 of the FCC rules. Operation is subjected to the following two conditions:
1) This device may not cause harmful interference, and
2) This device must accept any interference received, including interference that may cause
undesired operation.
Responsible Party: Lou deLaforcade
CXPLUSTW1
CXPLUSTW1 R
CXPLUSTW1 L
CXPLUSTW1 C
