My DIY Panel This is looking down at the panel from the top. Instead of building a "drawer" or "tray" style, I put the pegboard halfway between both ends of the frame by routing slats in the side frames. It isn't shown in the diagram, but the insulation will appear on both sides of the pegboard (the panel will be symmetric), allowing absorbtion from both sides of the panel. The interior of the panel is only 12" wide, with the whole thing being about 13.5" prior to fabric and batting being wrapped around it. A bit narrower than other designs...but that's the size I got when I cut my pegboard in half. The height of the panel is the same as the height of the pegboard, or about 4' tall. When it sits on a stand near the wall, the top will be about a foot higher than ear-level when I'm seated at my HT. My main concern is the thickness of insulation. Will a 2.25" deep cavity on each side, with 3.5" of insulation + batting, be sufficient to absorb a reasonable amount of sound? I don't know much about the acoustic properties of this type of fiberglass, but certainly if it's compacted past a certain density, it becomes reflective rather than absorbtive. I just want to know if the density I'm using is a useful one.