Have you considered buying a SPL Meter, a Test Tone CD, and an Equalizer, to modify what your existing speakers are doing in your space from your listening position?
https://dbxpro.com/en-US/products/2231
2231 model has longer sliders for more precision, and detents when centered, as well as bypass.
meter needs a bottom hole to mount on a tripod at ear level at listening position
’Amazing Bytes’ my favorite test cd with 29 1/3 octave test tones
I could help you find an inexpensive copy