I cut all of my speakers with (8 of them) with a Roto-Zip type tool. (Mine is a Ryobi, but takes Roto-Zip bits.) I advise using the heavy duty tile cutting bits, and not the light duty plastic cutting bits. Cut swiftly and smooth, as not to go so slow that the bit heats up. As soon as that bit heats up and discolors, its going to break. I never found a few pieces of those bits! You want full wrap around eye protection, and a full face shield if available. If you can keep the shop vac running at the base of your cut while cutting, it will help keep the mess at bay.