X-305 Makes Installing Ceiling Speakers Clean and Fast. We use the X-305 to install ceiling speakers in our whole house music systems. We get perfect holes for our 8 inch speakers with no dust! In fact, we have installed speakers in furnished houses without even moving the furniture, the X-305 is that clean. We just leave the speaker wires in the ceiling, let the drywall guys finish, paint, and then we cut. Perfect every time!