Panasonic VIERA TC-55DX700C Ehelp page 164

A.I. sound
(On/Off)
Equalizes overall volume levels across all channels and external inputs.
Gray-out when using Home Theater.
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Volume leveler
(+/-6)
Minimizes volume disparity after switching to external inputs.
Gray-out when using Home Theater.
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Distance to wall
(Over 1ft (30cm)/Up to 1ft (30cm))
Setting for wall mounted TV.
Over 1ft (30cm):
TV is on a stand. Keeps current setup.
Up to 1ft (30cm):
TV is mounted. Reduces low frequency level to prevent resonance.
Gray-out when using Home Theater.
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Preferred audio type
(Main Audio/Hearing Impaired/Visually Impaired)
Allows setting of the accessible audio format when its broadcast and the
language setting matches.
Digital audio out selection
(Auto/PCM)
Selects the initial setting for digital audio output signal from DIGITAL AUDIO
OUT and HDMI 2 (ARC function) terminals.
Auto:
Dolby Digital Plus, Dolby Digital and HE-AAC multi-channel are output
as Dolby Digital Bit stream. MPEG is output as PCM.
PCM:
Digital output signal is fixed to PCM.
For video content of Media Player / Network services.
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