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Yet none of this energy and dynamic power is delivered at the expense of subtler pleasures: Milstein’s Stradivarius displays beautiful harmonic layering, string tone, and agility with small dynamic shifts, while vocalists ranging from Sarah Vaughan [In Hi-Fi, Columbia LP] to Jeff Buckley [Live at Sin-é, Columbia CD], are reproduced with a natural balance, lack of cabinet coloration, and emotional expressiveness that makes the Mira a very engaging listen, and this remains true even at low playback levels.
The tweeter is a 1" Scan Speak driver, using the “Revelator” motor system. Andy chose this model for its low resonant frequency (1.5–2kHz) and ability to deliver the natural body of instruments. Woofers are 10" Danish-made Vifas. As with the $91,500 Hyperion, the Mira’s 24dB-per-octave acoustic slope crossover is hand-built, and point-to-point wired with custom film/foil caps (made exclusively for Rockport), custom inductors, and Caddock resistors. All are spec’d at 1% tolerance, and the unit is epoxy-potted for mechanical stability as well as reduced microphonics.
The Mira is internally wired with Transparent
cable and connected via Cardas rhodium posts. Unlike Rockport’s top
models, which are a built of a very costly carbon fiber, glass fiber, and
epoxy composite, the Mira’s Danish-made enclosure is pure MDF. The front
baffle is 3"-thick and the walls are 1"-thick. Seven individual braces lock
the cabinet’s panels together, while at the same time creating separate
acoustic chambers for each driver. The side-firing woofer housing has a 2"-
thick panel for the driver mounting surface and is rear-vented, says Andy,
“with deeply radiused edges to prevent port turbulence.” (Payor believes
that a properly designed vented enclosure allows for both lower driver
distortion and higher motor strength, and can couple to room boundaries as
well as a sealed cabinets.) The front-driver baffle uses a laser-cut Steinway-felt insert to reduce reflections from the midrange and high-frequency drivers. Long-fiber wool is used to damp the midrange enclosure, and a mixture of anechoic wedge foam and polyster is found in the bass cabinet. Finally, the enclosure is finished in high-gloss piano black polyester, an eleven-step process performed by the same European company that finishes Steinway grands—ah, that piano thing again.
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SPECIFICATIONS: Floorstanding, 3-way vented loudspeaker Driver complement: 1.1" soft-dome tweeter, 5.25" mid/bass driver, 10" side-firing woofer Frequency response: 30Hz–20kHz Sensitivity: 88dB Impedance: 4 ohms Recommended amplifier power: 50 watts minimum Dimensions: 10.25" x 44.75" x 19.5" Weight: 115 lbs. each |
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