ATS Acoustic Fill-it-Yourself Open Back Acoustic Panel frame in 24x24x4 inches. When open back panels are installed with an air gap behind them (often in a corner), bass absorption will be increased. The cutaway below shows how our open back panels are constructed and what they will look like once you add insulation and fabric to the FIY frame.

Available in painted or unpainted. Choose painted panels if a see-through, dark-colored fabric will be used.
- Inside depth: 3.5 inches, total frame thickness: 3.75 inches, thickness after typical fabric install: 4 inches.
- Actual frame dimensions: 23 3/4" x 23 7/8". Please note that these frames are designed to fit 2 layers of 2-inch Roxul AFB which allows for slight compression of the fill material at the edges. Rigid fiberglass boards, such as Owens Corning 703, will not compress to allow the insulation to fit flush within the frame. All insulation sheets must be trimmed down to fit within the frame’s length and width. After adding insulation and fabric, the frames will be 24" x 24".