Green Mountain Audio Callisto Brochure
Bookshelf / Compacts / Stand-mounts
All products include our Happy Ears for Life™ warranty
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Time / phase-coherent, high-performance speakers featuring Balanced-Phase™ first-order crossovers / Q-Stone™ cast marble, designed by physicist Roy Johnson
Green Mountain Audio
Summary: Designer’s concept
Creating the ideal small speaker requires attention to many details. The
woofer must have the lowest-possible distortion in the bass and voice
range. The tweeter must blend imperceptibly with it while delivering the
smallest, most delicate high notes. The crossover circuit feeding the two
should be simple, for clarity and efficiency, and must pass highs and
lows at precisely the same instant. The cabinet must be rigid and
absolutely quiet inside, shaped for minimal reflection off the outside. The
Callisto is my closest approach to those ideals.
Hear it all. It’s about...time.
| Write 310 South 25th Street COSCO USA 80904 | Call 719.636.2500 |
Pico Executive | Callisto | Aperture Center-Shelf | Europa Max | Europa
Visit greenmountainaudio.com | Email ItsAboutTime@greenmountainaudio.com
Callisto
“...jaw dropping good...”
“...took my breath away...”
“...these will change your life...”
It was easy to choose the same unique woofer as used in our Europa.
I’ve found no other woofer that responds as well to very soft and very
loud sounds with such very low distortion at all frequencies, because of
its patented neodymium magnet structure, supple suspension, and light,
rigid cone. The Callisto tweeter is one of the few to move enough air in its
‘bass’ range (the high-voice range) such that it doesn’t need reflections
from the cabinet to boost its output. A special arrangement of soft wool
felt around it absorbs those reflections for the clearest treble. The tweeter’s
delicate, treated linen dome responds to every small sound because of its rigidity and very flexible suspension.
Its chassis is completely damped in its own cast-marble chamber, for the highest clarity.
Eight pieces of Q-Stone™ cast-marble combine to make an extremely rigid cabinet. The ideal cabinet shape for
each tone range has been calculated using physics and mathematics. The front is shaped to prevent reflections
in the low-voice range, so less ‘box’ is heard. In the middle range, exponential shaping of the corners and its
overall asymmetric, elliptical shape prevent any tone from ‘talking’ to the edges. Finally, we use wool felt to stop
the high-voice range and treble from reaching nearby walls and furniture.
Many design breakthroughs led to the quietest possible cabinet. On the inside, an
asymmetric shape and the ports’ long tubes together scatter sound waves into thick,
ultra-low density fiberglass. Every sound is absorbed except the lowest bass tones needed
drive the ports. One of the principal reasons a speaker sounds like a speaker is that its
woofer and tweeter aren’t moving together, as one unit. Callisto’s woofer and tweeter
move in the most perfect synchrony ever devised. Our unique crossover circuit supplies
their signals with no unnecessary time delays. This ‘time-coherent’ motion is rare because
it’s difficult to engineer and can only come from using our simple, Balanced Phase™
‘first-order’ crossover circuit with very low-distortion, high-power drivers. Not only did
Callisto reward me, I’m honored that it will reward you, too. For life.
Hear it all.
It’s about...time.
for exceptional size-defying performance in
the monitor loudspeaker category, April 2005
“Best of 2005,” Paul Candy, sixmoons.com
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Specifications: Drivers, results & pricing
Bookshelf / Compacts / Stand-mounts
Woofer 6-inch rigid piston, single-pressed paper/carbon fiber cone with ultra-linear suspension, vented under-hung Kapton
voice coil. Shielded, radially-magnetized neodymium-iron-boron magnet. Enclosure Q-Stone™ cast marble. Twin, aero-dynamic
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ports fire down onto supporting base. Specially-shaped base prevents resonances between base and cabinet bottom. 4th-order
Time / phase-coherent, high-performance speakers featuring Balanced-Phase™ first-order crossovers / Q-Stone™ cast marble, designed by physicist Roy Johnson
Butterworth tuning at 54Hz with nearly zero box loss.
Green Mountain Audio
frequency, with large rear chamber, acoustically damped; enclosed in Q-Stone™ cast-marble chamber, mechanically damped;
hex-wound voice coil, Ferrofluid cooled; 0.44 grams moving mass.
-3dB at 47Hz and 21kHz. Typically –3dB at 47Hz on 24-inch speaker stands, at 8-feet distant. Adjustable base, +/- 5 degrees, to
accommodate listening heights and distances.
both at 98dB at 1m. I.M.D. is for any two frequencies separated by a 10:1 ratio.
200Hz to 8kHz on listening axis. Does not vary with loudness.
vary with loudness.
Power 7 to 170W (amplifier’s 8 Ohm rating). Crossover Balanced-Phase™ first-order circuit. Impedance 4.1 to 5.3 Ohms from
100Hz to 20kHz; 4.1 to 24 Ohms from DC to 100Hz. Does not vary with loudness.
Dynamically linear within 0.5dB to 100dB. Max SPL 105dB peak at 3m from a stereo pair, first-arrival (without room gain). Pair
matching
31, 2004.
“firsts”)
audible in any one direction. There is less ‘speaker’ sound.
surface below the woofer could be shaped to reduce those reflections specific to the voice range that are the the most difficult to
dispose of in two-way loudspeaker designs. The result is more clarity and less ‘box’ sound.
shaped to prevent the ports output from resonanting between the bottom of the speaker cabinet and the base.
base has adjustable spikes to allow the cabinet to be tilted up or down for the clearest sound.
from left-to-right and from front-to-rear, to pick up pressure changes uniformly from those two dimensions inside the cabinet.
This creates a smoother and more dynamic bass response.
trims: African Ribbon Mahogany, Bolivian Rosewood, Bubinga, Cherry, Cocobolo, Maple. Add shipping, applicable* fees.
Factory burn-in 100 hours, $75; 200 hours, $150.
Hear it all. It’s about...time.
| Write 310 South 25th Street COSCO USA 80904 | Call 719.636.2500 |
Polarity Positive, over full bandwidth. Dispersion Omni at 45Hz, smoothly decreasing to cardioid at 10kHz.
Amplitude +/- 0.25dB; impedance +/- 0.15 Ohms, 160Hz-8kHz; crossover parts +/- 0.15 percent. Birthdate August
Size 20.125"H | 8.75"W | 11.5"D with base. Weight 60lbs/27kg each. Contributions to sound reproduction (world
14 Patentable advancements 7, including: 1. Its uniquely curved shape helps disperse external reflections to be less
Tweeter Lightweight 28mm polymer-coated linen dome of low-resonant
Distortion <0.5 percent harmonic 100Hz-12kHz, <1 percent intermodulation,
2. The Callisto’s bass ports exit beneath the cabinet, so the front
USA pair pricing $2,900. Choose from six premium, solid hardwood
Pico Executive | Callisto | Aperture Center-Shelf | Europa Max | Europa
Visit greenmountainaudio.com | Email ItsAboutTime@greenmountainaudio.com
Response Freefield at 2 meters: +/-0.75dB 80Hz to 20kHz,
Rise time <10 microseconds, positive or negative input. Does not
All products include our Happy Ears for Life™ warranty
Phase shift +/- 2 degrees acoustically, from
Sensitivity 90dB for 2.83V at 1m, at sea level.
3. The base under the cabinet was
4. The Callisto
5. The two bass ports are staggered
Options
Among Comments: Industry
April 2005 Review, Sixmoons.com “Callistos took what the Meadowlarks do so well and punched it up to a completely
new level, especially in areas such as transient speed, slam, immediacy, and dynamics. The thumbs get two, way-up
thumbs. I cannot see how any lover of music could possibly be disappointed with the Callistos. They were truly mesmerizing loudspeakers and easily one of the most convincing and emotionally satisfying designs I have heard to date, even
compared to others at two to three times the price. You owe it to yourself to give these black beauties a listen.” Paul Candy,
Toronto, Reviewer, Six Moons.com (online audio review journal)
Hear it all.
*Taxes, customs, duties | Prices subject to change without notice | Copyright 2005-2006, Green Mountain Audio | For more visit greenmountainaudio.com
It’s about...time.
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