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The true ribbon tweeters have been fitted with twice as powerful neodymium magnets, which doubles the acceleration of the diaphragm while further reducing the very low distortion. The special alnico magnet mid range drivers has reduced mass and optimal phase plugs for faster response and lower distortion. The magnesium woofers have been redesigned for greater "openness" and cleaner sound. The subwoofer drivers have been improved with lower noise and distortion.
In addition, the passive crossovers, the electronic low pass filter, the subwoofer venting system and the wiring have all been redesigned for superior performance.
| "Awarded a rare five stars by TAS founder and chairman Harry Pearson, this massive four-tower, 23 driver (per side) array has evolved into a great speaker, possessed as it is of breathtaking performance in all areas - from its flat frequency response to its dynamic gradations, from its three-dimensionality and body to its extraordinary top to bottom coherence, from its smooth yet revealing nature, to its sheer musicality." -The Absolute Sound, Recommended Components (Class I, highest rating), October / November 2002 (HP's Workshop, issues 133, 134, 136). |
The system, consisting of seven main pieces, is comprised of the following:
GRAND REFERENCE VI MAIN TOWER
The Main Tower employs a total of 23 of the highest quality transducers per channel. The Main Towers are built in mirror-imaged arrays for accurate imaging. Eight advanced 4½ inch cast frame woofers per channel reproduce Bass and mid-bass frequencies from 40 Hz to 400 Hz. Four woofers are mounted at the top and four are mounted at the bottom of the Main Tower. The eight 4½ inch woofers employ cast, surface treated magnesium cones with natural rubber surrounds and solid copper-machined phase plugs. Perfect piston response is maintained to a high 10 kHz, far beyond their 400 Hz operating ranges, for excellent impact and low coloration. The woofers are mounted with two in each separate chamber and each chamber is loaded by an individual rear mounted double flared port. There are a total of 4 rear-mounted ports per Main Tower. Cabinet walls are bonded with proprietary damping layers for inaudible coloration. The low frequency section of the Grand Reference VI reduces the moving mass to only 27% of that of previous versions. The effect of this reduction in mass is a quantum improvement in providing a life-like bass attack.
The all-important mid range system consists of six 110mm tri-laminate cast frame transducers, per tower, operating on an open baffle over the range of 400 Hz to 3500 Hz and driven by premium Alnico magnet systems. The six mid range transducers are deployed in a short vertical line array, between the woofers and adjacent to the tweeters. The open baffle Alnico mid- range drivers provide excellent low-level resolution and dynamics, while eliminating cabinet mid range coloration. Harmonic structure is especially accurate, while the special transient response of this driver (as has been commented on before) allows clear separation of the attack, sustain and decay elements of musical sounds- for a more life-like reproduction.
The high frequency transducer system consists of nine 4-inch true
ribbon tweeters per tower, operating in a short vertical line array.
These transducers are true ribbons wherein the conductor and the
diaphragm are one and the same. The moving mass is only .0061 gram for
near instant acceleration. Extreme high-level transient attacks are
taken in stride without harshness, allowing for instance, live levels
of cymbals and other harmonically rich musical sounds to be reproduced.
Driven by heavy neodymium magnet systems, these transducers are equally
comfortable reproducing nuance as well as extreme peak levels. Nine
small ribbons are utilized in lieu of one large ribbon in order to take
advantage of the superior control of the smaller diaphragm, for greater
accuracy.
GRAND REFERENCE VI SUBWOOFER TOWER
The Grand Reference VI Subwoofer Towers are designed to complement the response of the main towers from 12 Hz to 40 Hz. The Main Towers operate full range to their acoustic rolloff while the Variable Low Pass Filter rolls off the response of the Subwoofer Tower at 40 Hz. This frequency is continuously variable separate, high current, stable amplifier is required to drive these towers. Each Subwoofer Tower consists of four high-output 12-inch transducers operating in a vertical array. Each transducer is isolated in a separate vented chamber to eliminate inter-driver interference. A 3-inch diameter exponential flared port is provided for each 12-inch transducer. The port is flared both on the inside of the enclosure as well as the outside, for minimum low frequency distortion. Special low distortion voice coils driven by massive double-stacked 7 LB magnets for each driver, provide greater than 1¼ inch peak to peak linear excursions. Output at 20 Hz with both towers driven is greater than 120 dB. Proprietary damping material is applied to the cabinet walls to further reduce coloration.
VARIABLE LOW PASS FILTER LP2
Based on a design pioneered by Carl Marchisotto when at
Dahlquist in 1976, this remains the preferred way to integrate a
subwoofer system with a high-quality, wide-band main transducer. The
LP2 provides continuously variable cut-off frequencies from 37 Hz and
up. Stereo bass is provided. The LP2 accepts balanced inputs and
outputs.
| Overall System
Frequency Range: 12 Hz to 46 kHz Main Tower Frequency range: 40 Hz to 46 kHz Subwoofer Tower Frequency Range: 12 Hz to 40 Hz, controlled by LP2 Variable Low Pass Filter |
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Last Update: December 25, 2017
