Most likely you can correct much of this through placement. Sometimes there are rooms that do not support certain wavelengths and without analyzing the dimensions it would be impossible to know, but likely you are getting a cancelation due to placement.
Here is our resource page. On the right side you'll see an article on loudspeaker placement. Hopefully this will help you some.
Here is our resource page. On the right side you'll see an article on loudspeaker placement. Hopefully this will help you some.