Alcons QR36 Leaves The Factory

15-Jul-05

Alcons is now shipping the first product of its Q-series: the QR36. The Q-series scalable ribbon-array columns represent a new type of product and can popularly be seen as a ìcross-over productî of a traditional point-source loudspeaker and a J-curved line-array system. The series has been designed as solution to obtain excellent coverage and ultimate intelligibility over longer distances in ìacoustically challengingî environments. Applications range from stand- or truss mounted single-unit mobile PA system, up to multiple-module flown array in reverberant halls or high ceiling theatres. But also as high power side-fill stage monitoring the QR36 offers new solutions, or as single-column main PA system in low-ceiling applications, where a J-curved line-array will not give satisfactory throw/dispersion results.The QR36 is a two-way passive-filtered modular line-source column. With a length of one (1) meter/39-in, the QR36 consists of 6x 6.5î woofers in frontal bass reflex-loading and 2 units of Alconsí RBN1801 18î pro-ribbon transducers with patented ìReal-90î horizontal dispersion. The frequency response is 74Hz ñ 20kHz.(+/-3dB), with a lowest usable frequency of 53Hz (-10dB). Power handling is 780W RMS, bringing 129dB continuous output, while the 6000W (!) peak power handling from 1kHz. up, offers a 150dB ìvirtually infinite headroomî.As an ìarray of line-sourcesî, a QR system acts as true cylindrical radiator, offering a 3dB SPL drop-off per doubling of distance (in the ìnear-fieldî or ìFresnel-zoneî). This brings significant advantages in SPL coverage and (intelligibility) throw, from a relatively simple system.When used in multiples, the QRís form a continuous line-source, extending the ìnear fieldî of the system over longer distance and lower frequencies. (QR36 / Alcons press contíd)The specific spacing of the sources (within half of wavelength) and the unprecedented frontal radiation of more than 92% make the QR36 compliant with the two most important (and most difficult to realise!) line-array criteria. The result is a very large ìmain lobeî without any significant ìspikesî above and below the array, preventing ceiling reflections and offering unusually high ìgain-before-feedbackî. Main component of the QR36 is the truly unique RBN1801 pro-ribbon driver; An 18î flat-Isophase ribbon-driver with previously unknown efficiency (110dB) and enormous system peak power handling of 3000W. Besides the physical behavior of the RBN1801 driver, the famous ìribbon-knownî transient-response and flat impedance (completely resistive amp.load) offer a sound experience that surpasses high-end HiFi-standards.The RBN1801 is mounted on a 90-degree HempHornô, but is also available with 120-degree dispersion for ultra-wide coverage. The Signal Integrity Sensingô pre-wiring ensures complete cable/connector compensation between QR36 and ALC controller-amplifier, regardless of length. In this way, the ALC can be loaded down to 2 ohms, without any sacrifice on response quality. As all Alcons cabinets, the QR36 system is finished in Durotectô scratch-resistant coating.

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