The problem is those speakers and gear you have. You should sell it all to me. Just kiddding, at least the first part.
Yup, I think some 2' by 4' by 2 or 4 inch thick rigid fg panels or something similar in the corners behind those speakers would be a start.
Yup, I think some 2' by 4' by 2 or 4 inch thick rigid fg panels or something similar in the corners behind those speakers would be a start.