My soundbar used to be connected to my tv but I've got a Roku now and I want to connect the soundbar to the Roku. Thanks, a clear step-by-step instructions would really help.
If you have non-tv roku it can't be done. Hook the roku to your tv and then the tv to the soundbar via either hdmi-arc or optical.
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I've been looking around some weeks ago because my brother has been having the same problem. Not sure if you have the same issue as him but here are the steps I forwarded:
Determine the compatible connection and connect the cable
Turn on both devices
Turn on “settings” on your TV, click on “control other devices”
Enable the connection you chose
Pull up the system audio control on the main menu
Return to Home. The soundbar should be working now.
FWIW, I found the steps here. Depending on your preferences, there may be more to configure.