I was having reflections off the fireplace glass surface so I used a leather couch as a bass trap/absorption device. It works perfectly!! Will write a review at some point.
Of course the sound is most important, but now that you know that it works, why don't you make a panel with fiberglass insulation and fabric on a frame?
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I was having reflections off the fireplace glass surface so I used a leather couch as a bass trap/absorption device. It works perfectly!! Will write a review at some point. 
