Stereophile
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<p><img class="story_image" src="http://www.stereophile.com/images/813opera.promo_.jpg" /></p> Colleen Cardas strongly urged me to try the Callas loudspeaker from Opera Loudspeakers (whose products she also distributes in the US), which she claimed was an ideal match for the Unison S6 amplifier I <a href="http://www.stereophile.com/content/fifth-element-80">reviewed last August</a>. In my experience, the stand-mounted Callas ($5000/pair) is unique among loudspeakers in being the logical contrapositive (inverted and flipped, so to speak) of the usual D'Appolito driver array of midrange-tweeter-midrange (MTM).
<p>
In the well-known D'Appolito array, one tweeter is partnered with two midrange drivers, one each above and below it. Opera's two-way Callas has one vertically centered 5" mid/woofer with a copper phase plug, and identical 1" soft-dome tweeters above and below it. As if that weren't enough, on the narrow rear panel are three more tweeters, identical to those in front, in a vertical array. The enclosure has two small ports, side by side at the top of the rear panel.
</p><p>
The Callas measures 14.8" high by 9" wide by 13.4" deep, its cabinet symmetrically tapering toward the rear, and weighs about 57 lbs. The cabinet is made of elegant solid woods and veneers in a high-gloss finish of medium-shade cherry (except for the recessed, black-painted base plate), with black leather cladding on the faceted fascia. There's a small brass badge on the base plate. Front grilles are provided, but I didn't use them. A single pair of robust, naked (non
[Source: http://www.stereophile.com/content/opera-callas-loudspeaker]
<p>
In the well-known D'Appolito array, one tweeter is partnered with two midrange drivers, one each above and below it. Opera's two-way Callas has one vertically centered 5" mid/woofer with a copper phase plug, and identical 1" soft-dome tweeters above and below it. As if that weren't enough, on the narrow rear panel are three more tweeters, identical to those in front, in a vertical array. The enclosure has two small ports, side by side at the top of the rear panel.
</p><p>
The Callas measures 14.8" high by 9" wide by 13.4" deep, its cabinet symmetrically tapering toward the rear, and weighs about 57 lbs. The cabinet is made of elegant solid woods and veneers in a high-gloss finish of medium-shade cherry (except for the recessed, black-painted base plate), with black leather cladding on the faceted fascia. There's a small brass badge on the base plate. Front grilles are provided, but I didn't use them. A single pair of robust, naked (non
[Source: http://www.stereophile.com/content/opera-callas-loudspeaker]
