Sony KDL-70X830B - Manual (Page 227)

Keep the TV away from electrical noise sources such as cars, hair-dryers,
Wi-Fi units, mobile phones, or optical devices.
When installing an optional device, leave some space between the device
and TV.
Perform [Fine Tune]/[AFT] in [Manual Program Preset] 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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