I’m still somewhat new to hifi - about 18 months in - but here is what I did after a ton of reading and watching a few youtube vids. This was with my old speakers which were Sapphire M3s - my new to me speakers, Rivals went into similar place but were spread apart more with more toe in and a closer chair. I went from 78% with the M3s to about 91% with the Rivals:
1. I started with speakers and chair about 30% into the room with the speakers about 20%-ish in from the side walls and moved around from there.
2. As I moved the speakers around and chair back and forth, I made the priorites as follows: 1) each speaker the exact, or very, very close the same distance from each ear to each tweeter. 2) each speaker the same distance from each side wall, all measurements from the tweeter. 3) always making sure the chair was exaclty in the center of the room width-wise. I measured the chair and put a dot in the middle of it. 4) from what I’ve read, make sure the distance from the side walls is not the same as the distance to the front wall.
It took me about 12-15 hours over 4-5 weeks to get the M3 there but it was a Eureka moment. My wife was amused or thought I was (more) crazy. Of course you need a good recording. The immersion into the music was something I have never experienced before. I played Abby Rd, side 2 and it was emotional - not crying or sad but some kind of elation and stayed wtih me for a few days.
I had the same thing with DSofM, side 2 about a week ago with the Rivals. The Rivals were more difficult so I also did this which helped:
-disconnected the left speaker and then moved that 1 speaker, the right speaker around to where it sounded the best - mostly concentrating on the bass and then once set, worked on toe for mids and highs. That wasn’t too far off where I had them but was a few inches - toe was a bit further out. That was closer but still not quite there. I had a fantastic center image and imaging but the speakers were still there.
Then I "installed" the Townshend Podiums and they were gone. For me - it is a sound stage that is all around but mostly in front but can be to the sides. They are staying put there for a while. Maybe for a long time.
To "test it" I used this method - which is pretty freaky when you experience:
https://forums.stevehoffman.tv/threads/play-the-kinks-waterloo-sunset-in-stereo-check-and-fix-or-improve-your-stereo-playback-with-it.320990/