rlmm has pretty much told you what to do.
small room will almost certainly have standing waves in the corners behind the speakers and possibly in the other corners.
a cheap fix is to get a sheet of 4x8 by 1/8 th particle board ripped into 2 pieces 2'x8'x say 92" ( to fit the height of an 8' ceiling ) and stand them in the corners. this will absorb some sub 300hz waves and diffuse higher frequencies and in most instances improves clarity in room, tightening image and adding spatial ambience by removing many standing waves.
enjoy the music!
small room will almost certainly have standing waves in the corners behind the speakers and possibly in the other corners.
a cheap fix is to get a sheet of 4x8 by 1/8 th particle board ripped into 2 pieces 2'x8'x say 92" ( to fit the height of an 8' ceiling ) and stand them in the corners. this will absorb some sub 300hz waves and diffuse higher frequencies and in most instances improves clarity in room, tightening image and adding spatial ambience by removing many standing waves.
enjoy the music!