Aperture HD Specifications

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Aperture HD: Concentrated state of the art

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Performance details

Application(s). Time-coherent 2-way speaker sounds best from tight places (from a bookshelf or as a center channel).

User adjustability (Soundfield Convergence™). Tweeter adjusts front-to-rear under removable top cover.

Room size. Small to medium, 100-600sf.

Power (amplifier’s 8 ohm rating). 7 to 170 Watts.

Response. +/- 0.75dB: 55Hz to 20kHz; - 3dB frequencies: 47Hz, 23kHz in room.

Distortion. <0.5% harmonic 100Hz-12kHz, <1% intermodulation, both at 98dB at 1m. (I.M.D. is for any two frequencies separated by a 10:1 ratio.)

Phase shift. +/- 2 degrees acoustically, from 200Hz to 8kHz. Does not vary with loudness.

Rise time. <10 microseconds, positive or negative input. Does not vary with loudness.

Polarity. Positive, over full bandwidth.

Dispersion. Omni at 47Hz, smoothly decreasing to cardioid at 10kHz.

Impedance. 4.8 Ohms, +/- 0.75 Ohms 100Hz to 20kHz. Does not vary with loudness.

Sensitivity. 90dB for 2.83V at 1m, at sea level. Dynamically linear within 0.5dB to 100dB.

Max SPL. 105dB peak at 3m from stereo pair, first-arrival (without room gain).

Pair matching. Amplitude +/- 0.25dB; impedance +/- 0.15 Ohms, 160Hz-8kHz; crossover parts +/- .15%.

Physical details

Cabinet finish and choices. Clad in black Texture-Kote™ for the look and feel of pin-grained leather. Cherry trims the top of the speaker. No other finish choices available.

Speaker Conditioning. Upon request, we will gladly condition the speakers' drivers before shipment at no additional charge.

Grilles. Speaker has been designed for grille to be left in place.

Accessories in the box. EarSticks; Allen wrench, Ownership Guide.

Size. 10.875"H; 13.875"W 13.5"D.

Weight. 29lbs. (13.2kg) each.


Technical specifications


Woofer diameter. 6" (17cm).

Woofer construction. Single-pressed paper/carbon fiber cone with ultra-linear suspension, vented under-hung 2-layer, 1" (25mm) voice coil wound on Kapton former. Mechanically damped chassis. Shielded, radially-magnetized, neodymium-iron-boron magnet structure with heat dissipating black coating; 0.32" (8mm) p-p linear excursion; 9.85g moving mass.

Woofer cabinet. Woofer mounted on Q-Stone™ faceplate attached to cabinet of multiple-layer MDF with Golden-Ratio Baffle™, 4th-order Butterworth ported. Attached vibration-absorbing rubber feet.

Woofer / Bass port. 2" (50mm) aerodynamic port on front tuned to 54Hz. The Aperture HD’s port is tuned to maximize low bass from a shelf-mount position. It is angled to transmit bass pressures most efficiently from inside the cabinet.


Tweeter diameter. 1.1" (28mm).

Tweeter construction. Lightweight linen dome, hand-coated with polymer. High-compliance, inverse-roll contiguous suspension. Hex-wound copper-clad aluminum voice coil wire, Ferrofluid cooled, high-strength aluminum alloy former, vented into large, damped rear chamber. 0.46g moving mass. Double neodymium magnets, fully shielded.

Tweeter enclosure. In Q-Stone™ enclosure, surrounded by inverse acoustic-foam and -felt horn. Integrated tweeter chassis damping.


Wiring. Exclusive High Definition CopperMatrix™ wire by Marigo Labs: 18-gauge, 500+ strand Litz wires of six-nines purity, single crystal, oxygen-free copper with proprietary winding geometry; double cryogenically-treated, organic dielectric insulation; proprietary internal vibration damping system. Pure metals love to ring. They do so sideways and also along their lengths. Because of their design, these CopperMatrix™ wires do not and can not ring.


Crossover. Balanced-Phase™ first-order circuit.

Zobel circuit's capacitor. Woofer: Ultra-premium quality. Tweeter: Ultra-premium quality.

Crossover principal capacitor. Woofer: N/A. Tweeter: Ultra-premium quality.

Crossover bypass capacitor. Woofer: N/A. Tweeter: Ultra-premium quality.

Binding posts. Made by Vampire Wire of pure oxygen-free copper, directly gold plated. Mounted on the back.