There are some problems that cannot be corrected through room correction EQ, namely the Speaker Boundary Interference Effect, which happens when the reflection

There are some problems that cannot be corrected through room correction EQ, namely the Speaker Boundary Interference Effect, which happens when the reflection from a wall is out-of-phase with the signal that you want to hear, and produces a deep valley in the frequency response. You could try boosting at the frequency that the valley is at, but that makes both the signal _and the reflection_ equally as loud. Therefore, they cancel out in almost the same manner for basically no net gain.