1. Make sure you’ve got a high speed HDMI cable (2.1
non-directional, they’re cheap on Amazon).
2. Turn on the Control for HDMI or BRAVIA Sync on both devices.
3. Set the ARC/eARC or TV Audio Input Mode of the audio system to On or Auto.
https://www.sony.ca/en/electronics/s...icles/00020051
The amp will have a TV Audio input or similar, it should be on that when using ARC.