Sony STR-AZ3000ES Startup Manual page 414

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
Dolby Digital or DTS multi-channel sound is not reproduced.
Check that the DVD, etc. you are playing is recorded in Dolby Digital or DTS format.
When connecting the DVD player, etc., to the digital input jacks of this receiver, make sure the digital audio output setting of the connected device is available.
Set [Audio Out] to [AMP] in the [HDMI Settings] menu or change the speaker output setting to "Audio System" on the TV.
You can only enjoy DTS-HD Master Audio, Dolby TrueHD, DTS:X Master Audio, Dolby Atmos, DSD and Multi Channel Linear PCM with an HDMI connection.
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