Sony STR-DA3700ES - Manual (Page 30)

30 US
It is not necessary to connect all the cords. Connect cords according to the jacks of your equipment.
* When you connect equipment with an optical digital jack, set “Audio Input Assign” in the Input Settings
menu (page 82).
Connections required for playing video games
PlayStation 3 (video game with an HDMI jack)
A
Video/audio signals
or
B C D
Audio signals Video signals
Video game without an HDMI jack
*