Have you treated your listening space?

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I see lots of pictures of $$$ systems in bare rooms.
What are the barriers for you to treat your room, or if you have already what benefits have you rendered?
I have improved the sound more than any other way by addressing the reverberant space that my system occupies.

"I would rather listen to a midfi system in a hifi room than a hifi system in a mifi room."
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