Legacy Audio Phantom HD - Manual (Page 7)

7
Precautions
If you have any doubts about your ability to properly install on-wall
loudspeakers, you should consider the services of a custom installer. If
you plan to install them yourself, always use high quality tools to save
time and make the installation go more smoothly. The Phantom On-Wall
Loudspeakers mount on standard 16-in center stud walls. Determine the
final location of both left and right speakers before drilling any holes
since changes to one speaker may affect the other either aesthetically or
acoustically. Look for pipes, wiring or any other conflicting material that
might be damaged before beginning the installation.
Speaker Installation