Fine adjusting analog channels
Press the HOME button, then select [Settings].
Select [Channels & Inputs]/[Channels, Inputs & Ginga]* → [Analog Channel Adjustment].
Select [Channel] → the channel you want to adjust.
Select [Fine Tune], then select [Auto] or [Custom].
Select [Custom] to change the frequency.
Press the RETURN button, then select [Audio Filter].
Select [High], [Low] or [Off] to set the audio quality.
* Option name differs depending on your region/country.