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The wall is not necessarily the problem when it comes to low frequency sound. These sound waves will travel through the floor. Here the same principles governing stereo sound systems come into play. Our ears will denote different sounds coming from separate locations only when they are in the high or mid ranges, so for these frequencies multiple speakers in different parts of a room make sense. And these speakers, to be most effective should be placed on a level with our ears. For base sounds, however, it's a different story. Doesn't matter how many speakers you have, the waves are too big to hear any separation. So for base, you only need one speaker, and the most effective placement is to direct it squarely at the floor. So to truly soundproof a room when music is concerned, unless you are on a concrete slab, you also need to separate the floor somehow.
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