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I have a Sony KD-49X8005C 49 inch 4K TV and just bought a Sony HT-XT1 2.1 Channel TV Base Speaker..wire it up ok via HDMI & ARC.
Hi there
If setup correctly, audio should not be going through the TVs speakers at all and only via the soundbar.
As you have connected other devices to the soundbar via HDMI Cable, you do not need the optical cables - which maybe confusing things. So remove them.
Ensure that 'Speakers' is set to 'Audio System' from the action menu.
Cheers