HDMI v1.3 and previous versions require an optical cable to stream audio to the 5.1 surround system.
New HDMI v1.4 doesn’t need the additional audio cable.
Specification of the TVs:
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HDMI v1.3
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Optical cable is needed according to Manual – pag 39
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HDMI v1.3 = 2x supported
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HDMI Features – Audio Return Channel = Not Supported
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