Once you've done what the article suggests, get yourself a good soundstage. Put the following video on loop:
Now toe (angle) your speakers in so they are pointing directly at your ears in your no.1 sweet spot. Sit and listen.
Toe your speakers out a few degrees. Sit and listen.
Keep doing this until you get a sharp focus on the audio soundstage. You might go past the best point so toe in/out as needed. Go with equal toe-in and only use different angles if you can't find the stage. -- If you cannot get the stage to focus, the speakers normally want equal toe in/out but room reflections could mean you have to play around with different angles. Sit, close your eyes and listen. If the "centre" sounds to the left, toe the left speaker out a tiny bit and vice versa.
Re-run the amp calibration (because you will have changed the room reflections).
For me, the focus is with a toe out of about 10 degrees. Your speakers might be different. My system was already a seriously good listen but this made a genuine leap forward in audio enjoyment and made me want to listen to a ton of music. Total time spent adjusting was less than 15mins.
"We're here to gsfopjeyWrziDF2dVkT524e you through" -- phew! I needed a gsfopjeyWrziDF2dVkT524e