Alcons Extends Coverage Of The QR24 Line-Source Column

The QR24/110 is a modular two-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 superb intelligibility and throw, in even the acoustically most challenging environments. The symmetrical acoustic design, in combination with the wide, patented 110-degree horizontal dispersion of the RBN High Frequency drivers (all the way up to 20 kHz), 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 two 12″ RBN pro-ribbon transducers for the mid-high frequencies, the system’s 90 percent 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 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 millisecond), 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 74 Hz — 20.000 Hz (-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 1.32-meter / 52-inch 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 7 meters / 24 feet tall.

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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 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-degree horizontal dispersion and can be combined with the QR24/110 in the same array.  Certified EASE data for the QR24’s with a 1-degree resolution accuracy is available on the Alcons website.

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Sara Abrons

About Sara Abrons

Sara Abrons is editor-in-chief of rAVe [Publications] and a graduate of the School of Media and Journalism at the University of North Carolina at Chapel Hill. Reach her at or on Twitter @SaraAbrons.