Might be worth experimenting with Room Correction if the idea doesn’t put you off too much. If you weren’t confident about doing this yourself, you could try out HAF - nothing to lose by trying (especially if you already have a calibrated mic) and it might just do the trick. There’s a very long HAF thread on the forum if you haven’t come across it - Roon & Home Audio Fidelity (Room Correction / convolution filter creation) . (I have no affiliation other than as a very satisfied customer)