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OPERA CALLAS
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FS: Opera Grand Callas Floorstanding Speakers | Commercial Classifieds
SoundStage! "The Traveler" -Giro del Veneto: Unison Research and Opera Loudspeakers (4/2008)
Opera Callas stereo speakers i with free UK delivery from Hifi Gear
Opera-Callas-Gold
Opera Callas Bookshelf Speakers
Opera Callas review | TechRadar
scott nangle on Twitter: "£3,995 Opera Callas Speakers £7,595 Callas + Unison Research Sinfonia SET + Stands The Callas are immensely capable, and arguably the best standmounter at this price level... Expansive