Sony STR-DA5700ES - Manual (Page 31)

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To connect equipment with jacks other than HDMI jacks
It is not necessary to connect all the cords. Connect cords according to the jacks of your equipment.
A Coaxial digital cord (not supplied)
B Audio cord (not supplied)
C Video cord (not supplied)
D Component video cord (not supplied)
Blu-ray Disc Player, DVD player
Audio signals Video signals
or or
A B C D