Perfect Speaker Placement - Put next to the back wall as much as possible.

Ignore Millercarbon’s comment. He would never let someone else’s obviously superior knowledge get in the way of his bravado. Odds are he didn’t even read it.

The article is targeted at near field monitor usage with emphasis on accurate frequency response for best mixing. Pretty much the article is spot on. Many audiophiles who have no clue how acoustics work just parrot others rules of thumb. Getting the speakers far into the room, in a small room, is one of those. This article explains why that is often a problem, but also says you need both acoustic treatment AND equalization to fix the resulting placement, but at least the final result will work properly while a speaker far from an untreated wall will leave you with a result that can’t be fixed and even if treated may not work properly.

It’s a good article in my opinion.

Just read the other article. They pretty much say the same thing and both are good. This was the one in your replies.

In Ethan's section on Real Traps he says 38% rule from front or back wall and then clarifies that's purely theoretical and is best measured.

"p.s. what should I do with half of the room left... :?"

Obviously, you should put another system at the opposite end! The listening chair can be swiveled to allow enjoyment of either system. I strongly recommend you have two very different systems setup for maximum variety and enjoyment. 

I am glad to have been such an influence upon you that I have helped to revolutionize your participation in the hobby.  ;) 

Oh, that should be FRONT wall not back wall.

Thank you @sangbro for posting these links. I am still experimenting with speaker placement and unlike @millercarbon am open to the idea I might actually able to learn something I don't. 

@millercarbon I will continue to read your post and learn what I can but why do you always have to be so caustic and condescending? Not everybody has your financial resources to buy thousand dollar plus power cords and all of the accoutrements you have. It's hard to reconcile the graciousness you've displayed to people who've been able to hear your system and the arrogance you put on display in your post. Have you considered the possibility someone else might know something you don't?

That’s a recording studio setup. If that’s what you’re doing, fine. Listen to the one above. He pretends to know a lot about it. If doing a home system though you could hardly do worse. Talk about unwilling to learn.

My system https://systems.audiogon.com/systems/8367

Mike Lavigne’s system. https://systems.audiogon.com/systems/615

Similar size rooms, vastly different budgets, yet look how similar the results, at least in terms of speaker placement.

Let me assure you, Mike Lavigne is the furthest thing from, what did he call him? Oh yeah, a clueless parrot you will find in all of audio. There is a clueless parrot here but its not us.

Our speakers and listening chairs are way out into the room for some very good reasons. Which you will understand very well only after absorbing an awful lot of information, which can be done most efficiently by reading the Harley book I recommend above.