No substitute for displacement. That said, I realize many are space or spouse challenged. In that case, get the best software correction you can.
That is correct ,and Steinway Lyngdorf's , Room Correction called "RoomPerfect" is the best in many peoples opinion.
I Concur.
I have tried and used
ARC
YPAO
MCCAC
Audyssey MultEQ
"Room Perfect" is head and shoulders above the rest.
It integrates a Sub better than ANY of the others. It gets The DEEP Bass RIGHT!! No bloat, Way more Bass Articulation and Detail