Sony S-Center Input: UNLOCKED FINALLY?! (Enables A80J as Center Speaker)

Ok so I think I cracked the mysterious Sony S-center input that has been sought after since it was introduced in the Sony TV's a few years ago, e.g.

• https://www.reddit.com/r/bravia/comments/o51vp3/possible_use_of_scenter_input_on_a80j/
• https://www.reddit.com/r/bravia/comments/wkdcqf/anyone_have_experience_using_a_sony_tv_as_a/
• https://www.reddit.com/r/bravia/comments/vmgdg3/a80j_as_center_speaker_in_51_setup/

I have to confirm 100% by building the actual cable that will allow me to hook it up to my AVR's center pre-out, but using alligator clips and my laptop as an audio source, I seem to have unlocked the S-Center.

Short clip of it working when i switch the 'TV as a center' option on and off, and then pausing/playing the source on my laptop: https://www.youtube.com/watch?v=Qr2OBeLlBcI

Short story of how I solved it, was pretty much I was walking my dogs and the idea came to mind that there's gotta be some 'handshake' or 'trigger' for the TV to know when an S-center-compatible device was plugged into the input.

I then considered the engineering side of how Sony would have done this as easily as possible. And the idea of basically remapping the TRS plug came to mind.

A bit of research found this recent video, which shows a Chinese youtuber with the new Sony HT-A9 where he added an aftermarket Center speaker onto the S-Center output of that system. It had a helpful pinout of the jack, at the 6:18 mark of the video, which shows the tip of the TRS as the Center channel audio, the middle ring being the 'identification signal', and the bottom one as ground:

https://youtu.be/XFJtE3oIBfM?si=yZQZTMO2VqBfD9wA&t=378

This confirmed my idea, and got my brain juices going about what could be the trigger/handshake for it. Then again, thinking about the engineering side of it and what would be the easiest thing to repurpose... The standard AV 12v remote trigger!

So all-in-all, the S-channel input is basically a standard analog TRS jack. The sleeve/bottom is the negative/ground, middle ring is the 12v positive, and the tip is the signal, that's it.

Now off to get out my soldering iron and try my hand at making this cable...

https://reddit.com/link/18uqvsk/video/c1wi2aih8i9c1/player