Sony MDR-HW700DS - Manual (Page 44)

Only one optical digital cable is supplied.
Tip
The signal input to the TV (OPT) IN jack is passed through as-is from the TV (OPT) OUT
(THROUGH) jack (Optical pass-through function).
Connect analog devices (VTR, TV, etc.) with an analog audio cable (sold separately).
Note
An analog signal input via the LINE IN jacks is not output via the TV (OPT) OUT jack
(optical digital audio output jack).
Connect the AC adaptor supplied.
When the volume of analog devices is too low
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