This is a simple adjustable speaker wall mount.
For adjusting the angle of the speaker just print a different length of the "Up connector".
Also it is pivoted so you can adjust the speakers to the center where the sound should go!
It is very universal -> you can cut other holes for different speaker -> this one is for a Technics speaker system.
You also need some screws depending what speaker you use. I used 2x M3x25, 2x M4x35 and nuts for the screws (plus 4 self cutting screws for the wall)