I read everything I could find on building my own acoustic panels and I think I am ready to go? . Which way is better for acoustic panels; build frame, place the unfaced side outward, cover with fabric than hang the completed board firmly against the wall; or cut 2 pieces of rigid FB (ex: 2 - 24" x 60") and place both faced sides against each other, making a sandwich with the faced sides in the middle, then place it in a frame, cover with fabric and place it 1" off/away from the wall? Is there any 'acoustical' benefit to using batting over the rigid fiber board before covering with fabric? Last question; should the sides of the panel (framing) be perforated?