Your soundbar has two digital inputs: an Optical and a Coax. It also have an analogue input on 3.5mm jack. According to the spec sheet it does DD and DTS decoding. It's a stereo + sub soundbar
Sky Q has sound output via HDMI and via Optical
The PS4 is HDMI and Optical too.
The simple solution is to put HDMI in to the TV from each source, then use Optical from the TV to the soundbar. This will work but there are a couple of catches. The main one is that a lot of TVs won't pass DTS5.1 to their Optical out. That can also be a problem with DD5.1 as well. What happens in practise is that the HDMI handshake between the TV and the source sets the audio preference to stereo over HDMI. That's what makes it to the speaker kit.
[Note: The product spec will often quote that the Optical out does DD5.1 but neglect to mention that that's only from the internal TV tuner, and built-in streaming apps, and for file playback via USB. There are a different set of rules for the HDMI inputs.]
In your case the speaker kit is stereo (2.1), so you could argue that nothing is lost. There are settings for Night Mode built in to the Dolby DD5.1 protocols, but the Sony soundbar may well have a pseudo-mode to try to emulate that.
These are either IR emitters or IR Receivers. They are used for controlling gear that's out of line-of-sight to the infra red remote. One example would be when there's a sound bar blocking the TV IR receiver. Another is where a source box such as a Sky satellite receiver is in a cupboard. Have a look at your manual.
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