I have 4 of these in my room. The difference they make is astonishing. My roommate who was not an audiophile before we started living together is maddened by how dramatic of a difference such tiny and inconsequential looking device can make. Having them in the wrong spot by even a foot is noticeable.
My placement: 1) Dead center rear wall between the two speakers at the high of my main (750hz-20khz) drivers.
2&3) At the primary reflection point on the side walls, inches matter.
4) behind primary listening position.
I want 4 more.
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