Set a sheet of plywood on a workbench or a table.
Determine the size diffusion panel you need to fit in your studio. Measure and mark cut lines with a tape measure and a pencil on the plywood. Generally, diffusion panels are between 4-by-4-feet to 6-by-6-feet.
Put on eye protection and cut the plywood to size, following the drawn lines using a circular saw.
Sand the plywood on both sides, including the edges to remove all splinters from the sheet. Blow off any sawdust with compressed air.
Lay Velcro strips around the borders of your diffusion panel and cut to fit with scissors. Glue the Velcro strips to the borders of the diffusion panel and let dry overnight.
Cover the diffusion panel with your choice of reflective fabric, plain or colored fabric, when needed.