Visual aspects of materials do not correlate with acoustic properties. Use only certified test data. I had 10 GIK 2ft x 4ft 244 panels in my listening room. They were inexpensive and highly effective (in the right settings). My room frankly was not one of those, it was properly proportioned and they barely helped. But in lesser rooms they made immediate improvements. Getting a right room is the second most important aspect to getting good acoustic results (after good speakers).
Besides loose fiberglass is harmful to your lungs!
