I am not as wise, or articulate as some of the prior posters, but I have three in my 13.5'* 23'*9 ft room and the results are well worth the investment, I see myself getting at least an additional one for the rear. I have no technical explanation to offer on why they work so well, but hearing is believing.
In fact putting one on either side wall, opened up the spatial spread in a manner which I would never have believed had I not heard it myself.
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