I cannot help you here because i only used my hearing not electronic equalization of the room to tune my room and many mechanical tuned resonators that work on large band frequencies for absorption and reflection...
It was not esthetical and not perfect but it was spectacularly good but it takes me too much time and effort and i will not recommend it to everyone save those who want to learn acoustics by -playing with it but i learned so much doing it i will do it again...
Anyway my speakers at the times did not go much under 50 Hertz..
I fixed my bass by the placement of the resonators and their dimensions and adjustment...
I have a 10dB resonant peak at 40Hz How do I fix it?