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  1. Ed*Wheaton

    subsonic filter

    Hi all I have a Polk audio psw-404,and I read a review somewhere that one reviewer was going to install a subsonic filter on his.2 questions..What is a subsonic filter,and do I need one? Thanks;)
  2. Ed*Wheaton

    subsonic filter

    Hi all I have a Polk audio psw-404,and I read a review somewhere that one reviewer was going to install a subsonic filter on his.2 questions..What is a subsonic filter,and do I need one? Thanks;)
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