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Alcons Extends Coverage of the QR24 Line-Source Column

Alcons Audio' QR24/110 is a modular 2-way column loudspeaker to be used as scalable vertical array system, for both permanent and (limited) portable applications. It combines a 1:1 linear and dynamic sound reproduction with intelligibility and throw, in even the acoustically most challenging environments.

The symmetrical acoustic design, in combination with the wide, patented 110 horizontal dispersion of the RBN High Frequency drivers (all the way up to 20kHz), offers a coherent horizontal pattern control with seamless coverage; This widens the "stereo sweet spot" significantly, for the off-axis positioned audience.

By using only 2 12" RBN pro-ribbon transducers for the mid-high frequencies, the system's 90% active frontal radiation results in a sharply-controlled vertical dispersion. This offers a unique, SPL-independent intelligibility-over-distance, without the necessity of DSP-based beam-shaping, the company says.

The flat frequency response and the fast transient response of the RBN mid-high frequency transducers, in combination with the sharply controlled dispersion, brings a maximum "gain-before-feedback" up to directly in front of / under the system.

Each purpose-designed RBN1203 12" pro-ribbon driver has a peak power handling of 2.000W (200 msec), creating a virtually infinite system MHF headroom of 4.000W from 1kHz up.

The low-mids are taken care of by 4x high-excursion, vented 6.5" transducers, which are co-axially mounted behind the pro-ribbon drivers, delivering a frequency response of 74Hz - 20.000Hz (-3dB).

The controlled (cylindrical) projection can be extended down to the lower frequencies by enlarging the array length through adding extra QR/QM modules (extending the "near field"). Up to two QR24 units can be combined on a single tripod stand, forming a 1,32m / 52" tall array; In flown configuration, up to 11 cabinets QR24 can be connected, with the integrated flying hardware under a safety-rating of 10:1, forming arrays of more than 7m/ 24' tall. The passive filtering allows multiple modules to be combined on one amplifier channel, up to three units.

The QR24/110 is powered and controlled by the ALC amplified loudspeaker controller; Through the integrated processing and feedback, the ALC offers QR24-specific drive processing with optimal response and reliability and utmost user-friendliness, the company says.

The Signal Integrity Sensing pre-wiring dynamically compensates for speaker cable/connector influences between the QR24 and ALC; This offers a 1:1, undistorted, natural sound reproduction, regardless of cable length and amplifier impedance load (system damping factor 10.000).

The QR24 is also available as QR24/80, with 80 horizontal dispersion and can be combined with the QR24/110 in the same array.

Certified EASE data for the QR24's with a 1 resolution accuracy is available on the Alcons website.

The QR24 comes with a 6-year "no-hassle" warranty.

Philip "Dr. Phil" de Haan, head of Alcons Audio R&D: "The QR24 remains a unique tool in the sound designers toolbox. We always get surprised looks when we demonstrate the unique razor-sharp edged vertical dispersion or the intelligibility at distances in excess of 100m / 330' with only 2 QR24 on a tripod stand."

Ever since the first installations at Red Bull's Hangar-7, the Koekelberg Basilica in Brussels, the Finnish National Theater, or the Flex club in Vienna, the scalable Q-series has made the crucial difference in tall ceiling theatres, reverberant churches, all-glass dome venues, low-ceiling clubs or deep, 10.000 seat council meetings.

De Haan continues: "the natural cylindrical wavefront of our pro-ribbons is the prominent part of the QR24's unique combination of a high-output, full-range HiFi response with a flat SPL coverage over distance, in even the most difficult acoustical environments. Or as a client put it: 'using Q-series is like switching off the room reverb'!"


(20 October 2017)

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