LG UltraGear GP9 Owner's Manual page 14

d Press the Function button repeatedly until the function LED turns red.
Note
• Prepare an optical cable. If you do not have an optical cable, you should purchase it separately.
• This speaker supports only PCM and Dolby sources in the Optical mode. Other types of sources may not sound
at all or sound distorted. If there is no sound, change the sources to PCM or Dolby from the game console.
• When an extra device connection is not working well via a Optical cable, contact your device manufacturer
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