Aspie is it possible for you to hang something like a curtain pole around six inches away from the said wall and just hang some really heavy curtain's or a roll of carpet under lay up on it . The noise will be greatly reduced by the cavity inbetween the curtain and the wall . If this is not possible you would best hanging it straight against the wall . The foam underlay would absorb some sound like that . But best if you can create a cavity . The old fashioned way of sound proofing a wall with egg boxes actually works but isn't brilliant but it's the shape of the boxes and not the material that makes them good at absorbing sound . A few old duvets hung on the wall ?
merry Christmas from the north pole
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