Just get a wall of Braun L46 Speakers
This is about the technology of how a soundfield should be and how things appear in it. It cannot be done with 2 speakers even if you employ some gimmick like Bacch.
Watch this interview by prog rocker Steven Wilson educating Darko.
Steven Wilson - Darko Interview
After that, you hit a show like MWave in Kansas City one year. Listen to a multichannel rig (more than 2 speakers) set up by Perlisten, Grimani, etc. Then, you go and sit in Axpona and listen to all the pairs of 2 speakers blaring away disappointingly.
Thereafter, you may truly conclude that you need more than 2 speakers.