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Meh, unless it involves a scissor lift, three unionized steel workers, and a non-union foreman -- just bring them in for the winter.
That said, I'm in CT and left the Promedias pictured below outside under a soffit for years without a problem. I replaced them with an excellent pair of KPT-100s purchased from Craig. http://community.klipsch.com/index.php?/topic/144995-kpt-100s-restored-and-ready-to-ship/
They wll be stored inside!