All of the above suggestions have their effect on the music.
My pet tweek is speaker positioning, and speaker isolation. The more precise the positioning relative to the listener, the more focused the soundstage, and you can tune things by changing the distance to anything, including walls, floor, distance between speakers (especially effective in tuning the amount of center focus). Don't be afraid to find your own inexpensive imitations of expensive tweeks - if you thoroughly understand the working principle, you can have all kind of fun with your own "implementations" of any idea, and some will work very well, indeed.
My pet tweek is speaker positioning, and speaker isolation. The more precise the positioning relative to the listener, the more focused the soundstage, and you can tune things by changing the distance to anything, including walls, floor, distance between speakers (especially effective in tuning the amount of center focus). Don't be afraid to find your own inexpensive imitations of expensive tweeks - if you thoroughly understand the working principle, you can have all kind of fun with your own "implementations" of any idea, and some will work very well, indeed.