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Immersa Custom Home Theaer A custom home theater on Long Island starts between $50,000 and $80,000+, depending on room size, display technology, audio configuration, and finish level — with most dedicated theater projects landing between $160,000 and $300,000 for a fully realized, professionally designed space. If you've started researching this, you've probably already discovered that the answer is almost never straightforward. You find a $799 "home theater system" on Amazon

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