Opera Loudspeakers - Did you know ? Opera Callas diva and grand callas speakers have a back radiation system with two additional rare tweeters. The result ? Sound stage expand in three dimensions | Facebook
Opera Loudspeakers - Opera callas Diva with rear radiation system for a unique listening experience | Facebook
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The World's Greatest Diva Gets a Houston Movie Moment: The Larger Than Life Tale of Greek Soprano Maria Callas
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