In addition to the aforementioned, also look up ATS acoustics. I have purchased supplies from them and built my own panels. Very inexpensive.
In general panels are often placed behind the speakers and at the primary reflection points on walls to the right and left of speakers. Corner bass traps on wall behind speakers. As a place to start I have done this in a basement room 12' x 15' with 8.5' ceilings.
What is the size of your basement room?
In general panels are often placed behind the speakers and at the primary reflection points on walls to the right and left of speakers. Corner bass traps on wall behind speakers. As a place to start I have done this in a basement room 12' x 15' with 8.5' ceilings.
What is the size of your basement room?