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absorption absorber diffuser reflections

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    Room Acoustic Help

    Hello, I'm trying to cut down on reflections in my room. I have a 7.1.4 system. For the sides and back walls I'm thinking of using a 1.5" thick mineralwool - 80 (8lbs). When I do pink noise testing, I can hear the back speakers off the front wall, which totally ruins the effect. Behind the...