I'd like to sound proof my existing walls because of the train horn is quite loud. What will be the better solution for this problem.

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Posting the question on an appropriate web site would be a good start :-) – Garry Aug 12 '10 at 7:44
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Try the Home Improvement site diy.stackexchange.com – pelms Aug 12 '10 at 9:49
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closed as off topic by hyperslug, Ivo Flipse Aug 12 '10 at 8:02

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