Tweaking Your Speaker Placement

as some have mentioned; this distance is irrelevant. Move them according to sound, not distance.

The distance your moving them is in direct proportion to the sound.

@rubicon15 

How many blatant flaws and red flags can you spot in that Sumiko video?  

As you know, this is only one process. There are a number of processes available. Some of them are fairly simple and others are much more time consuming. Personally, I would try more than one over an extended period of time. I have not read the book. 

I attach a string to my listening position. I then measure the inbound corners of both speakers to ensure they are the same. I then follow the same procedure for the outbound corners. This method not only provides perfect speaker distance but also exact angle (toe in).