Thanks for the question, mmcgill829,
Starting fresh in our hobby, I would first consult with a professional...one experienced in tuning rooms for 2 channel stereo and sound studios. I recently established contact with James of GIK Acoustics in adding a diffusor/absorber/bass trap to my studio. Even with much prior tuning, the results are stunningly good. I would also suggest reading "Good Sound" by Laura Dearborn...seemingly dated, but continues to be some of the clearest, useful basic advice available. In print, used copies are also available on Amazon.
Nearly 5 decades into better sound, like some have mentioned here, the loudspeaker / room relationship is the starting point. Money spent tuning the room for audio is the most cost effective and sensible way to begin. Once in place, ALL efforts to better your sound will play out.
More Peace! (bold print for old eyes) Pin