I have surround sound speakers with the speaker wires going up through the wall. The wire is fixed and doesn't slide in and out the wall.
Now it's time to tidy it up!
- How much loose wire should I leave?
- How can I tidy up the loose wire?
From the images I can see that you have space behind the speakers to hide them by rolling the wire and taping it. Hope this helps!
My first concern here is safety and code compliance. Ordinary speaker wire is not in-wall-rated.
You need to use CL2 or better, CMR rated cable for in wall use..
CL2R is short for Class 2 Riser Site detailing low voltage cable options
As far as neatness goes, installing a termination panel or a "brush" wall plate would help
Decora style insert which would mount to a low voltage old work ring