Sony KDL-55W900A - Manual (Page 219)

Keep the TV away from electrical noise sources such as cars, hair-dryers,
Wi-Fi units, mobile phones, or optical device.
When installing optional device, leave some space between the device
and TV.
Perform [Fine Tune]/[AFT] to improve sound for analog reception.
Set [Audio Filter] to [Low] or [High] to improve sound for analog reception.
([Audio Filter] may not be available depending on your region/country.)
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