Rout a chamfer on the speaker openings

Set up a router with a 45-degree chamfer bit. Start with a shallow cut, then adjust the depth, cutting deeper and deeper until you’re happy with how it looks ( Photo 9).

Make sure the screws that fasten the speaker to the panel won't poke through the area that’s been chamfered. When all your cuts are made, sand and finish the assembled enclosure and panels, then fasten the components.