Sony STR-DA3700ES - Manual (Page 29)

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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)
* When you connect equipment with an optical
digital jack, set “Audio Input Assign” in the Input
Settings menu (page 82).
Blu-ray Disc Player, DVD player
Audio signals Video signals
or or
A B C D
*