Gellfart Audio - Opera Callas - Made in Italy! | Facebook
Opera Callas Speakers Reviewed - HomeTheaterReview
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
Osage Audio Products, LLC
Opera Loudspeakers - Opera callas Diva with rear radiation system for a unique listening experience | Facebook