A lot of good advice has been offered so far. One additional point: automatic DSP systems are powerful but don’t always come up with the result you will like best. (I use an Anthem STR Preamp with Anthem’s ARC to help smooth bass response in my basement room.) If you choose an automatic DSP system, try to pick one that will let you change or fine-tune its solution. That is far preferable to one that does not.
Well, I lied. A second point: DSP is one of the few practical ways of smoothing really low bass, which is below the frequency range in which most common acoustic traps and panels are effective.