FAQ AND TROUBLESHOOTING

LSX II LT

A. FAQ AND TROUBLESHOOTING

A1. SET-UP

A1.1. How do I set up the speakers?

A1.2. What router specifications do the speakers support?

A1.3. Can I use a mesh router?

A1.4. How far apart can I place the two speakers?

A1.5. How large a room can the speakers cover?

A1.6. Can I change the Primary Speaker as the left channel?

A1.7. Do I need to pair the two speakers?

A1.8. Can I rename the speaker?

A1.9. Can I use the speakers without a Wi-Fi network?

A1.10. Can I use my own USB-C cable for inter-speaker connection?

A2. PLAYBACK AND STREAMING

A2.1. Which is the best wireless streaming option for different apps?

A2.2. Can I stream audio output from Youtube, Netflix and other media contents to the speakers?

A2.3. Is the subwoofer output mono or stereo?

A2.4. How should I set the speakers if I prefer to adjust the volume on an external equipment (preamplifier, streamers/multi-room systems) rather than through the KEF Connect App?

A3. TROUBLESHOOTING

A3.1. What should I do to set up the speakers to another network?

A3.2. What should I do if I cannot find my speakers in the network during set-up?

A3.3. How do I report a bug or an issue?

A3.4. There is no sound from both speakers.

A3.5. There is dropout from both speakers.

A3.6. There is no sound from the Secondary Speaker.

A3.7. There is dropout from the Secondary Speaker.

A3.8. The audio is out of sync with the picture when using the speakers with a TV.

A3.9. I have connected the speakers to the TV with an HDMI cable, why is there no sound?

A3.10. I have connected the speakers to the TV with an optical cable, why is there no sound?

A3.11. I cannot find a radio station or podcast in the KEF Connect App.

A3.12. I cannot adjust the speaker volume.

A3.13. I want to use my own USB-C cable as inter-speaker connection, but there is no sound on the Secondary Speaker.

A3.14. How to reset the speakers to factory defaults?

LED INDICATORS

A. FAQ AND TROUBLESHOOTING

A1. SET UP

A1.1. How do I set up the speakers?

First of all, a home Wi-Fi network is required. This is to ensure you can enjoy the full range of features and keep the system up to date.

Then, download the KEF Connect App from the App Store or Google Play Store and install it on your mobile device. Follow the instructions in the KEF Connect App to get the speakers connected (onboarded) to your home Wi-Fi network.

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A1.2. What router specifications do the speakers support?

IEEE 802.11a/b/g/n/ac, IPv4, IPv6, Dual-band 2.4 GHz / 5 GHz

For better streaming stability, especially on hi-resolution music files, a 5 GHz Wi-Fi network with a router transmission speed of at least 1300 Mbps is recommended.

Office, hotel, guest and public networks often feature additional security or authentication methods which may prevent the speakers from connecting. You may need the help of the network administrator to configure the network to allow full functionality if using these kinds of networks.

LTE routers/mobile hotspots will work, but may also consume a significant amount of battery power and mobile data.

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A1.3. Can I use a mesh router?

Yes, we have tested the most popular mesh routers and they are working well with the speakers. However, as there is not yet an industrial standard for mesh routers, each manufacturer may have their own meshing technology. If your mesh router does not work with the speakers, make sure you have updated your router to the latest firmware or contact the manufacturer for solutions.

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A1.4. How far apart can I place the two speakers?

Wired: Cable length up to 8 meters.

Optimal listening distance between the speakers and the listener will depend on how far the Primary Speaker and Secondary Speaker are separated from each other. Try to aim for approximately the same distance between the Primary Speaker and Secondary Speaker and between the speakers and the listener.

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A1.5. How large a room can the speakers cover?

10–100 m2

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A1.6. Can I change the Primary Speaker as the left channel?

By default, the Primary Speaker is the right channel and the Secondary speaker is the left channel. After connecting the speakers to your home Wi-Fi network, you can inverse the L/R channels in the KEF Connect App.

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A1.7. Do I need to pair the two speakers?

The Primary and Secondary Speakers are paired once the supplied USB-C Interspeaker cable is connected. If you do not hear any sound from the Secondary Speaker, see chapter “Troubleshooting”.

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A1.8. Can I rename the speaker?

Yes, renaming can be done in the KEF Connect App. This will change the name for both Wi-Fi and Bluetooth connections.

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A1.9. Can I use the speakers without a Wi-Fi network?

Although it is possible to use the speakers without going through the onboarding process by enabling the non Wi-Fi mode or non wireless mode, we do not recommend doing so.

By doing so, you will miss out on important features, bug fixes and improvements that are included in the firmware updates.

We suggest to first onboard the speakers via a Wi-Fi network. This allows you to check for and apply any firmware updates which are important for you to fully enjoy all features and improvements. After the update, you can use the speakers with or without the Wi-Fi network according to your preferences and requirements.

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A1.10. Can I use my own USB-C cable for inter-speaker connection?

We do not recommend using USB-C cables from other manufacturers for LSX II LT interspeaker connection. The supplied interspeaker cable has proprietary configurations to meet the performance that we aim to achieve.

As there are numerous commercially available USB cables with different configurations, it would be hard to determine if certain cable models work with LSX II LT, ensuring no safety concerns.

If you really want to use your own cable, make sure that the cable supports USB 3.0 or above, and PD 3.0 or above

Note that KEF will not be liable for malfunctions or property damage caused by third party cables.

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A2. PLAYBACK AND STREAMING

A2.1. Which is the best wireless streaming option for different apps?

Recommendations for the best wireless streaming options with regard to music/media apps on your mobile devices.

App
Wireless streaming protocol
AirPlay 2 Chromecast Music streaming app native protocol KEF Connect App Bluetooth
Spotify Spotify Connect -
TIDAL TIDAL Connect
QQ Music QPlay -
Apple Music - -
Amazon Music -
Deezer -
Qobuz -
Internet radio -
Audio podcast -
Youtube (audio) - -
Youtube Music * - -

 

✓ = Supported
= Supported and recommended for the best audio quality and streaming stability.
*Only available with a Youtube Music Premium account.

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A2.2. Can I stream audio output from Youtube, Netflix and other media contents to the speakers?

You can stream through AirPlay, Chromecast or Bluetooth. Subject to changes according to the platforms.

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A2.3. Is the subwoofer output mono or stereo?

The output is mono.

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A2.4. How should I set the speakers if I prefer to adjust the volume on an external equipment (preamplifier, streamers/multi-room systems) rather than through the KEF Connect App?

In the KEF Connect App:

1. In Settings, go to “Volume”, change “Volume Display” to “-/+”
2. Select the relevant source input.
3. Change the volume to 71. The source selection is now set to “Unity gain”.

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A3. TROUBLESHOOTING

A3.1. What should I do to set up the speakers to another network?
  1. In the Speaker list, tap the info icon ( ⓘ ) to enter Speaker info page.
  2. Tap the arrow icon ( > ) on the Network row.
  3. Confirm to change the network.
  4. Select a new Wi-Fi network and input the password.
  5. After changing the network for the speakers, connect your mobile device to the new network in order to control the speakers.

Alternatively, perform a factory reset to clear the previous network settings and all EQ and system preferences. For this purpose, press and hold the Reset button (RE) on the back panel until the LED light above the button blinks.

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A3.2. What should I do if I cannot find my speakers in the network during set-up?

Make sure the LED light of the Primary Speaker is blinking white and amber. The speakers are ready to connect to a Wi-Fi network.

Wait for about 30–40 seconds for the speakers to be visible on the speaker list.

If you still cannot see the speakers, make sure your mobile device, the speakers and the router are within line of sight (the closer the better).

The speakers broadcast on Channel 2 (2.4 GHz band). If your router overlaps this channel, it may cause issues with discoverability and connection. Go to your router settings and configure the 2.4 GHz channel to avoid overlapping with Channel 2.

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A3.3. How do I report a bug or an issue?

In the KEF Connect App, go to “Settings” > “Support”. To let us better understand the bug or issue, please provide a descriptive report.

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A3.4. There is no sound from both speakers.

Check if the speakers are already turned on and not muted.

Make sure you are playing the correct set of speakers and have selected the correct sound source.

Check the volume level, you may need to turn up the volume.

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A3.5. There is dropout from both speakers.

A congested network environment reduces bandwidth for music streaming, you need to set up the speakers to a less crowded router channel.

Check if there is a network problem. Perform the speaker connection test in the KEF Connect App.

Change the audio streaming quality in the KEF Connect App to a lower resolution.

A congested network or multiple wireless devices lead to high interference. Try to minimize the interference around the speakers. If the problem persists, connect the internet port of the speakers to the router.

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A3.6. There is no sound from the Secondary Speaker.

Check if the supplied interspeaker cable is well plugged in between the Primary and Secondary Speakers.

Make sure the appropriate USB-C Interspeaker cable is used.

Check if the interspeaker cable is inserted in the correct connection ports.

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A3.7. There is dropout from the Secondary Speaker.

Check if the supplied interspeaker cable is well plugged in between the Primary and Secondary Speakers.

Make sure the appropriate USB-C Interspeaker cable is used.

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A3.8. The audio is out of sync with the picture when using the speakers with a TV.

If available, try the video delay/lip sync function of your TV.

Use HDMI/optical input, and try to avoid Bluetooth connection. There is an inherent delay in the Bluetooth codec.

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A3.9. I have connected the speakers to the TV with an HDMI cable, why is there no sound?

Make sure the source is switched to TV for the speakers.

If the LED indicator light of the Primary Speaker is blinking light blue, the HDMI connection is not found. In this case, make sure that the HDMI cable is connected to the ARC port of the TV.

If the LED indicator light of the Primary Speaker is pulsing light blue, only CEC (not ARC) connection is established (TV may respond without sound). In this case, do the following:

  • The HDMI CEC connection needs to be enabled on the TV. As manufacturers may name this connection differently (e.g. Anynet+ for Samsung, Simplink for LG), please check the user manual of your TV on how to turn on HDMI connection for your TV. Once the HDMI CEC connection is enabled, the LED indicator light of the Primary Speaker illuminates light blue briefly and then fades out (both CEC and ARC connections are now established).

If there is only no sound but everything else is working, please make sure that the audio output of HDMI is set to PCM (this is often set to Dolby Digital by default). As the settings menu of each TV manufacturer is different, please refer to the user manual of your TV. Also check the settings within the application in use (e.g. Netflix and Disney+) and make sure PCM is selected. The Primary Speaker is detecting non-PCM signals if the LED indicator light is blinking light blue and purple.

Change the HDMI cable (our internal tests found that HDMI cables of lower quality may not be able to establish the connection) and make sure the HDMI cable is properly connected.

As a last resort, power cycle the TV (unplug the power cable from the TV and wait about 10-15 seconds before plugging it back in) and try again. Smart TVs are like phones and sometimes require a reboot.

If the problem persists, please report the issue in the Support section of the KEF Connect App for investigation. In the meantime, use the Optical connection as a fall-back solution.

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A3.10. I have connected the speakers to the TV with an optical cable, why is there no sound?

Make sure your TV is set to output digital audio in PCM format.

If the problem persists, try a different optical cable or connection option (e.g. HDMI).

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A3.11. I cannot find a radio station or podcast in the KEF Connect App.

We are constantly updating and expanding our database for radio stations and podcasts. Please use the Support function in the KEF Connect App and send us the RSS link of the website. After verification, we will add it to our database.

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A3.12. I cannot adjust the speaker volume.

Check if you have set a maximum level for volume adjustment.

Check if you are connecting and controlling the correct set of speakers in the network.

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A3.13. I want to use my own USB-C cable as inter-speaker connection, but there is no sound on the Secondary Speaker.

Check if the USB-C cable is well plugged in between the Primary and Secondary Speakers.

Make sure your own cable* supports USB 3.0 or above, and PD 3.0 or above.

*We do not recommend using USB-C cables from other manufacturers for LSX II LT interspeaker connection. The supplied interspeaker cable has proprietary configurations to meet the performance that we aim to achieve (for more info).

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A3.14. How to reset the speakers to factory defaults?

To do so:

  1. Press and hold the reset button on the back of the Primary Speaker for approximately 5 seconds until the LED light above the button flashes orange.
    The LED indicator of the Primary Speaker should flash white and amber.
  2. Launch the KEF Connect App and follow the instructions to set up the speakers.

Alternatively, factory reset can also be done through the KEF Connect App:

  1. In the Speaker list, tap the info icon ( ⓘ ) to enter the Speaker info page.
  2. Tap “Factory Reset” at the bottom of the screen.

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LED INDICATORS

The connection and operation status can be easily checked through the colours and patterns of the LED indicator lights on the Primary and Secondary Speakers. Refer to the table below.

Speaker Pattern Status
Primary Blinking white and amber LSX II LT is ready to connect to a Wi-Fi network. Launch the KEF Connect app to set up the speakers.
Primary Pulsing amber The speakers are in Standby Mode and trying to connect to a Wi-Fi network.
Primary Solid amber* The speakers are in Standby Mode and connected to the Wi-Fi network.
Primary Blinking amber The speakers are unable to connect to a Wi-Fi network.

  • Make sure your router is turned on.
  • Move the Primary Speaker closer to the router. If the problem persists, connect the Primary Speaker to your router by a LAN cable.
  • If this happens right after the network connection, it is likely that the Wi-Fi password is incorrect. Perform factory reset (Press and hold the Reset button (R) on the Primary Speaker until the LED light above the button blinks) and try the connection process again.
Primary Solid white* The speakers are operating in Wi-Fi mode.
Primary Solid green* The speakers are operating in Spotify Connect Mode.
Primary Solid blue* The speakers are operating in Bluetooth Mode and a device is already paired with the speakers.
Primary Pulsing blue The speakers are in the Bluetooth discovery mode and are ready to pair with a Bluetooth device.
Primary Solid light blue* The speakers are operating in TV Mode.
Primary Pulsing light blue* The speakers are connecting to a TV.
Primary Blinking light blue The speakers are not connected to a TV.
Primary Solid purple* The speakers are operating in Optical Mode.
Primary Solid pink* The speakers are operating in USB Mode.
Primary Blinking white slowly The speakers are muted in Wi-Fi Mode.
Primary Blinking blue slowly The speakers are muted in Bluetooth mode.
Primary Blinking light blue slowly The speakers are muted in TV Mode.
Primary Blinking purple slowly The speakers are muted in Optical Mode.
Primary Blinking pink slowly The speakers are muted in USB Mode.
Primary Blinking light blue and yellow The connection between the speakers is interrupted.

  • Make sure the inter-speaker cable is connected between the Primary Speaker and Secondary Speaker.
  • Make sure the inter-speaker cable is inserted in the correct connection ports: “(T) To P/S” on the Primary Speaker and Secondary Speaker.
Secondary No LED light The Secondary Speaker is operating normally.
Primary and Secondary Blinking red quickly

System error.

  • Pull the power cable from speaker.
  • Wait approximately 60 seconds.
  • Plug the power cable back to speaker.
  • The LED indicator of the Primary Speaker should be pulsing amber, indicating that the speakers are attempting to connect to the network.

If the problem persists, please contact your KEF dealer.

Primary and Secondary Blinking red and amber slowly Overheat protection is activated.
Primary and Secondary Blinking white, blue, light blue, purple and pink alternately The firmware is being updated. Do not unplug the power cable until the firmware update is completed. If you encounter any issues during the firmware update, do not interrupt the process and contact your local representative or contact your local KEF dealer.
Primary and Secondary Blinking red slowly

The firmware update process failed.

  • Unplug the power cable from speaker.
  • Wait approximately 60 seconds.
  • Plug the power cable back to speaker.
  • Perform the firmware update again on the KEF Connect App.

If the problem persists, please send a log from the KEF Connect App (Settings > Support > Report issue).

Primary Blinking red and light blue slowly The Secondary Speaker is missing during firmware update.
Primary Blinking light blue and purple slowly Non-PCM signals are detected in TV mode (HDMI).
Primary Blinking blue and amber Non Wi-Fi mode is activated.
Primary Blinking light blue and amber Non wireless mode is activated.
*The LED indicator light illuminates briefly and fades out when there are no active interactions with the speakers (e.g. controlling playback or volume).


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