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
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Opera Callas Diva Speakers (Pair) at Audio Affair
Opera Audio Divina Floorstanding Speakers user reviews : 5 out of 5 - 1 reviews - audioreview.com