Absorbers made, placement advice (w/ pics)

Hello All, I made 4 two foot by eight foot bass traps using 4" Roxul RHT40 mineral fiber and I made 14 two foot by four foot panels using 2" Roxul RHT40. Looking at the photos would you think it would be a better idea to have my 4 two foot by eight foot panels all across the back wall (including the corners) behind the drum kit [pic 1] or to use the eight foot bass traps only in the corners and use four foot traps on the wall just above the drummer's head (above the Rhodes and Hammond organ) [pic2]? Any help would help, Caz P.S. The room size is 11W X 16L X 10H and the 2' X 4' panels are space 3" from the wall

Caz, > would you think it would be a better idea to have my 4 two foot by eight foot panels all across the back wall < All of the above. Seriously, the goals with bass trapping are 1) to have enough of it, and 2) to place it around the room in all of the corners. The more corners you treat, the better the results. I'll also add that "which is the better location" is an impossible question. It may be that panels placed in the front will do more at 80 Hz than 100 hz, and panels in the rear will do the opposite. Or some other similar change. If you have a PC you can download the demo version of the ETF software and measure this for yourself. --Ethan

Here are some more details that may be helpful: This is my only room where I record an acoustic drum kit, electric and acoustic guitars, strings, spinnet piano, organs, and vocals. I record each instrument one at a time using my trusty Sony 7506 headphones. The floor is 11' W X 16'L, the walls measure in at 8 feet from floor to where it meets the ceiling, the ceiling maxs out at 10 feet, the height from the 2x4 joists to the ceiling is 2 feet, and the volume of the room is basically 1584 cubic feet. Thusfar, I have built four 8 foot four inch thick bass traps for the corners and fourteen 4 foot 2" panels for the walls and ceiling. I was always able to muster out some good sounds out of the untreated room, but I was never happy with my drum tracks which sounded boomy and undefined. Caz There are some sound file examples of my recordings here: www.pascalgoespop.com