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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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tboooe OP
1,009 posts
 
Thanks guys. Makes a lot sense.

Newbee, my room layout/restrictions limit my ability do everything I want to with acoustic treatments. I cannot treat sidewall reflections because there is a door and a window there that the family needs access to. I cannot put my speakers too far into my small room for the same reasons. And the wall behind my head is actually only 1/3 height with large openings to my large family room and kitchen.

Again, thank you for the input!
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