JBL Control 25 Ball Mount

Tested and works great. Don't over tighten the screws when installing. If you are using this outside or overhead use caution and also use appropriate resin to protect from uv damage.
I personally only use these to mount speakers outdoors about 2 feet above the ground.

Print at 100% infill.

*Note I have not tested this on Filament printers only Resin so use caution.