Look for used Infinity Intermezzo 2.6 active monitor or floor-standing Prelude MTS. The R.A.B.O.S. will eliminate the boom, and you won't have to sacrifice deep bass. In addition, you can drive either of these speakers with a 12-watt SET. I have done so in a huge room and a small room, and they really sing either way.
Otherwise think about getting an analog parametric EQ, e.g., Rives PARC.
Otherwise think about getting an analog parametric EQ, e.g., Rives PARC.