Interesting read. Von schweikert uses a Pink noise tone, Wilson has there own version.
What helps is Identifying the first reflection point and putting some sort of absorption there. Good luck
Speaker Placement and Toe-In
I just spent hours moving my Sopra 2’s with them sitting on the Townshend’s podiums #3. I kept intense measurements. My speakers are 115" from the woofer center to the other speaker woofer. I am sitting at that same distance from the L&R speakers’ middle centerline. They are 37" from the sidewalls to the sidewalls of the speaker.
I used one of those air bladder wedges that are used for lifting car doors and lifted each leg individually of the Townshend podium just enough to slide a furniture mover/disc under each leg.
What I found is that I prefer no Toe-In. That is, I prefer the speakers straight out into the room.
At least at this moment I am content.
ozzy