Green Mountain Audio Aperture 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
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
Aperture
center channel / shelf-mount
Summary: Designer’s concept
Whether used as a center-channel, all front channels, or for
two-channel music, the Aperture is specifically designed to deliver
the best possible sound from a bookshelf.
For the best clarity, a combination of ultra-low density
fiberglass and a miniature of our proprietary, Golden-Ratio
Baffle™, derived from our large floorstanding speakers, makes
Aperture’s cabinet extremely quiet inside without restricting
low bass from reaching the port. The cabinet’s front face is
molded from our Q-Stone™ cast-marble and surrounded by
19 wood panels made using four different thicknesses.
The tweeter has its own Q-Stone™ housing, separate from
the woofer enclosure. It applies full mechanical damping to
the the tweeter’s chassis. Reflections from nearby surfaces
are prevented by our proprietary Inverse Acoustic Horn™. It’s
a special shape of acoustic foam and wool felt, and absorbs
sound that’s normally directed to the sides and up and down
the face of the speaker. The tweeter is adjustable from front
to rear so that the sound may be customized to any listening
environment. This same tweeter is also used in our flagship
Continuum 3 because it’s alive with detail and never upset by
harshness in voices or sound effects. I use the Aperture’s
woofer in other speakers because no other woofer will play
with such low distortion at any loudness, from the high-voice
range to the low bass. The bass boost created by nearby
surfaces is offset by a special tuning of the Aperture’s enclosure.
These two drivers must move in unison as they are blended
together by the crossover. Our simple, Balanced-Phase™ ‘firstorder’ crossover circuit keeps this timing the most precise that
has ever been achieved, and extracts power from any amplifier
with the least distortion.
The Aperture is a compact loudspeaker
specifically designed for bookshelf and
home theater placements.
I’m honored to offer a speaker that has been perfectly—and specifically—designed for use on a bookshelf. As
with all speakers we manufacture, you’ll hear all of the original signal—from the lowest bass to the highest
treble notes—and everything in-between, the way they were meant to be heard. You deserve to hear it all.
Hear it all.
It’s about...time.
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Specifications: Drivers, results & pricing
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.
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cast marble face with wood cabinet. Two-inch aerodynamic port on front for 4th-order Butterworth tuning at
Time / phase-coherent, high-performance speakers featuring Balanced-Phase™ first-order crossovers / Q-Stone™ cast marble, designed by physicist Roy Johnson
52Hz. Removable top cover for access to adjust tweeter’s position. Neoprene isolation feet. Solid cherry trim.
Green Mountain Audio
Tweeter Lightweight 28mm dome of linen, hand-coated with polymer. High-compliance, inverse-roll contiguous
suspension. Hex-wound copper-clad aluminum voice coil wire, high-strength aluminum alloy former, Ferrofluid
cooled, with 0.46 grams of moving mass. Large, damped rear chamber. Double neodymium magnets, fully
shielded. Mounted in beveled Q-Stone™ cast marble housing with integrated tweeter-chassis damping. Adjustable from front to rear for directing soundfield to listening area (Soundfield Convergence™), for cabinet placed
18 to 72 inches from floor.
Soundfield-Converged axis, on first arrival tone bursts, across 75dB dynamic window.
harmonic 100Hz-12kHz, <1 percent intermodulation, both at 98dB at 1m. I.M.D. is for any two frequencies
separated by a 10:1 ratio.
not vary with loudness.
Polarity Positive, over full bandwidth. Dispersion Omni at 47Hz, quickly decreasing to cardioid at 10kHz.
Power 7 to 150W (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.
90dB for 2.83V at 1m, at sea level. Dynamically linear within 0.5dB to 100dB. Max SPL 100dB peak at 3m from
a single cabinet, first-arrival (without room gain).
Ohms, 160Hz-8kHz; crossover parts +/- 0.15 percent.
13.5"D.
advancements
Black Texture-Kote™ with inlaid, hand-dyed and lacquered premium cherry trim. Options 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 |
Response +/- 0.75dB 55Hz to 20kHz, -3dB at 47Hz and 23kHz, from 2.5 to 6m, on
Phase shift +/- 2 degrees acoustically, from 200Hz to 8kHz on listening axis. Does
Rise time <10 microseconds, positive or negative input. Does not vary with loudness.
Pair matching Amplitude +/- 0.25dB; impedance +/- 0.15
Weight 29lbs/13.2kg each. Contributions to sound reproduction (world “firsts”) 4 Patentable
1 USA pricing, each $2,500. Add shipping, applicable* fees. Matched pairs available. Finish
Pico Executive | Callisto | Aperture Center-Shelf | Europa Max | Europa
Visit greenmountainaudio.com | Email ItsAboutTime@greenmountainaudio.com
Birthdate January 3, 2004. Size 10.875"H | 13.875"W |
Bookshelf / Compacts / Stand-mounts
All products include our Happy Ears for Life™ warranty
Enclosure Q-Stone™
Distortion <0.5 percent
Sensitivity
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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