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Grand Reference Series VI

Grand Reference Series VI

Overview

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Grand Reference Series VI

The system, consisting of seven main pieces, is comprised of the following:

Two Main Towers w/ external bi-wired passive crossover
Two Passive Subwoofer Towers
One LP2 Variable Low Pass Filter (Electronic)
Two IP-1 Crossover Isolation Platforms
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.

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.