Congratulations on receiving your new pair of C8/A8! Use this guide to learn about pairing C8/A8 with your preferred device, charging the batteries, and restoring the earphones to their factory settings. 

What's included in the box

• C8/A8 wireless earphones and charging case
• Type-C USB-cable
• Interchangeable ear tips in four different sizes: XS, S, M & L
• Owners manual
• Warnings Manual

Before getting started

⚠️  Sudio C8/A8 is delivered with a protective film covering the charging connectors between the earbuds and charging case. The film needs to be removed in order for the earbuds to charge/turn on.

The earbuds will likely have some existing battery charge, however it is recommended to fully charge C8/A8 before using it for the first time.  

Turning C8/A8 on or off

C8/A8 powers up as soon as the earbuds are removed from the charging case, as indicated by the LED lights on the earbuds and the audio feedback 🔈 Power On.

Similarly, C8/A8 is turned off when placing the earbuds back into the case. 

You can also use the touch controls to power the earbuds on or off. Do this by holding the touch control for 7 seconds on either earbud. 

Pairing with a device

Jump to complete guide

C8/A8 enters pairing mode when the earbuds are removed from the charging case. Open the Bluetooth settings on your device and wait for C8/A8 and the device to locate each other, then select Sudio C8/A8 when it appears in the list. You will hear 🔈 Pairing Successful, confirming that the devices are paired with each other!

Charging the batteries

Jump to complete guide

There are three batteries in total on C8/A8; one in the charging case and one in each earbud.

The C8/A8 earbuds charge their batteries automatically when placed inside the charging case, this is indicated by the LED lights on the earbuds. Make sure to first remove the protective film which is covering the charging connectors.

The C8/A8 case is charged with a Type-C USB-cable. When the case is charging, you will see a light on the front of the charging case. It is recommended to use the Sudio Type-C USB-cable that's included in the package, but the charging case may be compatible with third-party Type-C USB-cables as well.

Restoring C8/A8 to factory settings

Jump to complete guide

If C8/A8 is behaving unexpectedly or you simply wish to restore it to its original settings, reset it by taking the earbuds out of the case and touching (holding) the touch points on both earbuds for 6-8 seconds until you hear Power Off. Then release and touch (hold) the touch points on both earbuds for 8 seconds again until you hear 3 clicks. Leave the earbuds close to one another until they resynchronize with each other. 

You may then proceed with pairing C8/A8 again.

C8/A8 powers up as soon as the earbuds are removed from the charging case and the audio feedback 🔈 Power On. When pairing C8/A8 for the first time, you hear 🔈 On followed by 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device.

⚠️  Sudio C8/A8 is delivered with a protective film covering the charging connectors between the earbuds and charging case. The film needs to be removed in order for the earbuds to power on.

Pairing C8/A8 with a device

1. Remove the C8/A8 earbuds from the charging case and fit them inside your ears.
2. Go into the Bluetooth settings on your device. The C8/A8 earbud LED lights are flashing white while scanning for available devices. 
   • For iOS (iPhone), go to the Settings app and select Bluetooth.
   • For Android, go to the Settings app, then select Connections followed by Bluetooth.
   • For Windows 10, click on the Start button, select Settings followed by Devices, and then Bluetooth and other devices.
   • For macOS, go to the System Preferences app and select Bluetooth.
3. Locate and select Sudio C8/A8 in the Bluetooth list on your device.
4. When paired you will hear the audio feedback 🔈 Connected.

If C8/A8 has previously been paired with your preferred device, simply remove the earbuds from the charging case and they will automatically connect, so long as Bluetooth is activated on the device and C8/A8 has not been paired with a different device more recently. 

Device compatibility

C8/A8 uses Bluetooth version 5.4 which is compatible with a wide range of Bluetooth devices. The paired device does not need to be the same version, but similar versions are more likely to maintain a strong connection. 

Signal interference

Some wireless devices may interfere with each others' signals, such as WiFi-routers, smartwatches, other Bluetooth devices, etc. If they operate within the same frequency, you may experience interference such as dropped sound and glitching. The easiest way to locate the cause of interference is by maintaining one connection between devices at the same time or take your C8/A8 and connected device outdoors to see if the interference clears.

C8/A8 can be up to a maximum of 10 meters (32 ft) from the paired device, but the connection may break if they are blocked by walls or similar objects. 

Pairing with multiple devices

C8/A8 can remember up to 10 paired devices, which means that you don't have to follow the pairing step every time you switch between devices. When C8/A8 is turned on, it will automatically connect to the device most recently connected.

If you want to reconnect to one of your previously paired devices, please disconnect Sudio C8/A8 first from the device you are currently using, and click "Sudio C8/A8" in the list of the next device you want to connect.

C8/A8 has a touch control button on each earbud that allows you to control certain features on your paired device.

Music/video playback

• Touch once on either earbud (left or right) to play or pause
• Touch twice on the left earbud to rewind
• Touch twice on the right earbud to go forward
• Touch three times on the left earbud to decrease volume
• Touch three times on the right earbud to increase volume
• Touch (hold) for two seconds on the left earbud to turn on the voice assistant
• Touch (hold) for two seconds on the right earbud to turn ANC on/off

Incoming phone calls

• Touch once on either earbud (left or right) to accept a phone call
• Touch (hold) for two seconds on either earbud (left or right) to reject or end a phone call*

*It's not possible to end a call using the touch controls while using third-party conference software due to different software protocols. 

Power

C8/A8 powers on and off automatically when the earbuds are taken out or put back inside the case. However, you can also control this without using the charging case.  

• Press (hold) for six seconds on either earbud to power off both earbuds (🔈 Power Off).
• Press (hold) for six seconds on either earbud to power on the single earbud(🔈 Power On).

If C8/A8 starts behaving unexpectedly, or if you wish to remove the connection between D1 and the connected device, you can perform a factory reset to restore your Sudio D1 to its original settings. This will reset the connection between your paired devices, as well as the connection between the two earbuds.

1. Take the earbuds out of the charging case.
2. Wait until the earbuds have gone through the voice feedback saying: 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device. Then proceed with pressing and holding both touch points on the earbuds for 6-8 seconds until you hear Power Off.
3. Release the touch button, and once again hold both touch points of the earbuds for 6-8 seconds until you hear 3 clicking sounds.
4. Leave the earbuds out of the case and close to one another for 20 seconds so they can resynchronize. 
5. Place the earbuds back in the case and close the lid and allow 3 minutes before using the earphones again.

When you hear 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device, proceed to pair them with your Bluetooth device.

C8/A8 has three built-in batteries; one inside the charging case and one in each earbud. The battery inside the case is used to charge the earbuds, while the included Type-C USB-cable is used to charge the case.

Charging and play times

The earbuds can be used for approximately 6.5 hours on one charge, with up to 30 hours in total before the case needs to be recharged.

Each battery takes approximately 90 minutes to fully charge. 

Charging methods

The C8/A8 case can be charged with a Type-C USB-cable, wireless charging is not supported. We recommend using the Sudio cable included in the package, however, other third-party Type-C USB-cables may be compatible too.

Charging case (no cable inserted)

• White: 26-99% battery remaining
• Red: 0-25% battery remaining

Charging case (with cable inserted and charging)

• White (fixed): 100% battery charged
• Red/White blinking: 0-99% battery charged

Cleaning your earphones on a regular basis will ensure the best possible sound performance and prevent them from wearing out sooner than expected. 

Use only a slightly damp cloth when cleaning the earbuds and/or case. You can also use a fine brush or cotton swab to gently clean inside the case, avoiding damage to the charging connectors (copper pins). While the C8/A8 earbuds and case are sweat- and splash-proof, subjecting them to high moisture levels could lead to permanent water damage.  

Keep in mind that with time, some discoloration may eventually appear. This is most common if the earbuds or charging case continue to come in contact with dirty surfaces or materials over extended periods of time.

Click here to download the C8/A8 user guide (PDF)

Yes, you can use one C8/A8 earbud on its own for both playback and calls. Both earbuds have the same components (speakers and microphones), which means that you can use either the left or right earbud at your leisure.

To ensure a stable connection, always keep the unused earbud inside the charging case. 

It’s always a good idea to charge both earbuds until full after having used them separately to maintain the same battery levels.

No, C8/A8 does not support wireless charging through Q1-technology or similar. Charge your C8/A8 case by inserting a Type-C USB-cable and connecting it to either a USB-port or to a wall socket via an adapter.

We recommend using the Sudio cable included in the product packaging, however other third-party Type-C USB-cables may be compatible too.