Audio Fix / setup help

KEF LSX II: check silent HDMI television audio with PCM

KEF LSX II — check silent HDMI television audio with PCM. Follow the exact documented route and keep the actual result.

Manufacturer-documented Reviewed 2026-11-09 · Revision 1

Follow these checks in Audio Fix →

When this guide applies

Exact KEF LSX II. Already network-onboarded system and known ARC cable/TV setting; no connector swap or HDMI-reset sequence. Only normal external user controls; no mains modification, chassis opening, reset or firmware installation.

Connection scope: HDMI / ARC / eARC audio. Symptom: There is no playback sound.

This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.

If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.

Checks and possible outcomes

Start at scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.

scope

Confirm the exact setup

The installed cable already connects TV ARC/eARC to the speaker TV port, ARC/CEC is enabled under that exact TV’s instructions, network onboarding is complete and listeners/source owner accept pausing playback for a PCM change.

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

a1

Pause the TV source before changing audio format

Keep speaker listening volume low.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

a2

Set the TV’s documented digital output to stereo PCM

Use its actual menu; Auto/Bitstream/Dolby is not assumed to mean PCM.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

a3

Select TV mode in KEF Connect

Do not select Optical or a similarly named streaming service.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

a4

Compare the same quiet TV passage

Record the actual connection/input indication without resetting the TV or speakers.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

result

Check the actual result

Does the known HDMI return path play compatible PCM?

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented KEF LSX II official User Manual ↗PDF pages 39–40: HDMI television input and TV mode — LSX II uses ARC on the TV’s correctly labeled audio-return socket. The TV must output PCM, not Dolby/Bitstream/Auto. Select TV mode in KEF Connect. The system must first be onboarded to the local network.Exact KEF LSX II. No LSX/LS50 port, wireless interspeaker, HDMI or USB power mode is substituted across models. Actual app menu must match. · Source checked 2026-11-09

Possible result

Confirm the unknown detail first

Do not infer a source setting, installed cartridge, connector role, software state or partner capability. Obtain the exact documentation before continuing.

insufficient data

Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

    Possible result

    Keep the actual observation for support

    Record the exact model, source, input and last observed response. These checks do not diagnose a failed component. No reset, service work or blind update is prescribed.

    next support

    Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

      Possible result

      Checks completed — keep the observed result

      This records the observation in this particular setup, not a guaranteed cure, physical Audio Review test or measurement.

      steps completed

      Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

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