[bpape]

Front corners are not large enough for effective bass absorbers, use the 2 rear corners for this.

Kill the front wall completely - 100% coverage in 2" absorbtion (due to long length to width ratio and very limited options for bass control).

Side walls will need at least 3 2'x4'x2" reflection panels on each side wall - potentially more depending on how the reflections fall.

Back wall - Personally, I'd do some 2" material with an FSK facing on it and cover 100% with cloth. Again, this is providing more bass control without overdoing the highs.

Bryan