I recently moved my gun safe to a temporary house(building a new one). The temp house is my great grandmothers place, and well...its kinda run down. So I have lots of latitude to piddle with the interior. In moving the rifles I purchased 4 pieces of 1" thick eggshell foam to layer them in the back of may car. These are 4'x4'(16 square feet). Once I had all the rifles/pistols safely ensconced in the safe I took a look at the eggshell and got an idea. Grabbed the staple gun and went to town. I tried to imagine the sound waves bouncing about and stapled the pieces in the areas I guessed I might get reflections. The ceiling tile would not hold staples, so I stuck with the walls. Sound now? YEAH! Love how a small bit of sound absorber really tightened things up. Now to the question: I did some figuring and I can line the ENTIRE room for around 450 bucks. I don't care how it looks, sound is the only consideration. Will a completely(well mostly) echo proof room lose anything? Clarity or punch? Or is some reflection a good thing?