I have a combined family/HT. Three walls are panelling and 1 is brick (an acoustical nightmare). I built several absorption panels that helped a bit but the WAF was not good. To make matters worse, the wife purchased several movie poster and had mounted in glass frames. She did not want to hear about reflections. I just found a good source for OC 703 and 705 panels. I am going to remake the absorption panels. The new panels should be about 1/2 the depth of my other ones. I was trying to think of a way to build poster frames using the 703 as backing. Will the posters pass enough sound to make this an effective absorber? Has anyone tried this before?