Originally Posted by BenMcr

So the two things you'd need to look out for are:

HDMI ARC (Audio Return Channel)

The ARC will send the soundbar whatever the TV audio is via an HDMI connection. This does depend on your TV supporting it.

HDMI CEC (Consumer Electronics Control)

This is normally branded by different companies (for instance Samsung call it Anynet+) but the aim is to allow your TV to control attached devices via the HDMI connection. This would mean the soundbar comes on when your TV comes on, and the volume of the soundbar is controlled by the TV too.

As long as you have both of these supported on your TV and Soundbar, then you can achieve what you're after