Front call absorption, pls explain theory...


This weekend I decided to experiment with absorption on the front wall between my speakers. I placed 2 pretty thick pillows on the wall and was very pleased with what I heard:

-more holographic presentation of music especially vocals
-better layering of instruments in sound stage, I could more clearly visualize the varying depths of the instruments, perhaps helped by the fact that voices were presented more forward

Being the nerd that I am, I want to know what is the theory or technical explanation of whats happening. Or maybe I am better of being blissfully ignorant and enjoy the improvement?? :) Thank you in advance for helping me understand more about room acoustics.
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