Move your speakers out from the front wall! At least three feet, but more is better. Will probably make more (positive) difference than anything else you can do.
What is your best kept secret in mid-fi?
We all come across some enlightening revelations as we strive for what this sonic nirvanah promises, and think to us, I wish I had known this t h e n (especially before we spent umpteen thousands on ?). If you have keys to good sounds for all to enjoy (affordable), it's satisfying to share them, and is educational to the readers.