Nail the frame together by attaching two 7 1/2-foot boards to 2-foot boards. Use tenpenny nails to nail the short boards to the top and bottom of the long boards. When finished, you will have a 2-by-8-foot wood frame.
Attach a 2-by-8-foot piece of pegboard to one side of the frame using finishing nails. Turn the frame over and lay the fiberglass insulation inside the frame so the paper backing is against the pegboard and the fiberglass is facing up.
Cut a piece of hardware cloth, which is similar to chicken wire but more rigid, the size of the outside of the sound panel’s frame. Use heavy-duty staples in an electric staple gun and staple the hardware cloth to the frame over the fiberglass.
Cover the hardware cloth with bonded polyester fiber batting extended over the edges of the wooden frame. Staple it into place. Do not stretch the batting too tightly, but it should not have any wrinkles.
Stretch muslin over the entire frame and wrap it around so it can be stapled to the back side of the sound-absorbing panel. The muslin should be stretched tightly.