Curious what speakers you use and if you have your room treated.
I recently moved into another room ca. 35m2. I have two +10dB room modes at 70 and 140 Hz and built 8 big bass traps and several absorbers for the early reflection points. The effect on the decay times was massive, but the frequency response changed very little.
I have the Presonus Eris 5 at the moment, but want to buy somwthing better next year. Maybe Neumann KH120? Something down to 40Hz would be nice but lower will cause more room problems again. I have a large mode at 45Hz that I can measure with the Eris 5, but is almost inaudible as the speakers only go down to 60Hz.