The line in is a stereo input only.  You can’t get any surround sound or atmos out of a headphone jack.  

Sonos buffers streaming audio and line in sources, everything but TV sources via HDMI-ARC or optical, by around 75 ms so that it can properly sync different rooms to play together.  There is nothing stopping you from using the line in to connect your TV, but there is a good chance that you’ll see lip sync issues that bother you too much.

Personally, I’ve tried line in with a Sonos Connect to a TV and found the delay too much.  I have not tried the line in on the Era 300, but the 300 is currently connect to my TV (happens to be Samsung too) via bluetooth and I don’t really notice much of a delay.  Since I don’t use that TV often anymore, and stereo is just fine for this case, that’s how I’m going to leave it.

Hello

Currently have a play 5 gen 2 with line in from my TV

You can delay the audio out from the Samsung TV so I set it to the same as the sonos latency.

Sync is not an issue.

I was wondering does it send out psudeo surround sound from a stereo line input in the same way hi fis and soundbars have sound presets. Ie “Hall in munich”

Ps my tv cam out put dolby digital so would surround sound travel over a Bluetooth pairing?

No, a stereo connection, such as the line in on a PLAY:5 or Sonos Five can not carry any surround data. It’s limited to two channels of data. 

For Bluetooth, I’ve never seen it do anything beyond stereo. And the PLAY:5 of either generation does not have a Bluetooth capability associated, so it doesn’t matter. 

A line level stereo signal can carry dolby Pro.logic.

Would the era 300 output stereo via all of the speakers it contains.if connected to a stereo source.

I am aware the play 5 does not have Bluetooth.  I was thinking if I bought a era 300 would it take dolby sound and metadata via Bluetooth.

I wasn’t aware anyone still encoded anything in Dolby Pro Logic. 

Not sure I understand your ‘all of the speakers’ question.

No, the Era 300s would not take anything beyond stereo when using Bluetooth. It could, if you actually had Dolby Pro Logic encoded data, be included, but it would not carry anything like Dolby Digital 5.1 data. 

Hi mate

Yes Dolby PL rare now but its surround even though bare minimum.

I was referring to all of the drivers

Ie upward side firing speakers

Might be a stereo line in but would it radiate sound in all directions ie 8 channel stereo . My yamaha av amp does that if your source us stereo but you want all speakers to fire.