LR28 larger-format line-array system

LR28 larger-format line-array system

June, 2015

The Alcons LR28 is a larger-format line-array system, with a fully-symmetrical 3-way configuration, suitable for even the largest applications.

The LR28 combines the highest sound quality possible with very high SPL capabilities and throw. It offers an intuitive, fully predictable linear response behavior, with perfect intelligibility and identical tonal balance at any SPL. By implementing Alcons’ pro-ribbon technology for mid and high frequencies, a super-fast impulse response with up-to-90% less distortion and a flat frequency response beyond 20kHz. is achieved.

Alcons RBN1404rsr pro-ribbon transducer mrrrThe all-natural cylindrical wavefront of the multiple-patented, purpose-designed RBN1404rsr pro-ribbon transducer enables a precise pattern control, without any distortion-inducing horn constructions; In the vertical (coupling) plane, the virtually side-lobe free projection creates a perfect wavefront coherency for an unprecedented throw; In the horizontal plane, the 80-degree horizontal dispersion is maintained down to 190Hz.

Due to the true HF peak power handling of 3000W and the RMS-to-peak ratio of 1:15, the LR28 excels in intelligibility and throw with maximum dynamic headroom reserve.

The MF-section features 4 high-efficiency 6.5” midrange transducers with Neodymium motor-structure in a slot-loaded configuration.
The mid section and RBN high section are jointly mounted in/on the aluminium cassette for optimized heat-dissipation/reduced power-compression and prolonged system output.

The LF section consist of 2 reflex-loaded, custom 14” woofers with reinforced cone and large voice-coil Neodymium motor-structure for improved heat dissipation to reduce power compression.

The LR28 is powered and controlled by 4 channels of the Sentinel10 amplified loudspeaker controller; Through the integrated processing and feedback, the ALC offers LR28-specific drive processing with array-compensation, filter-presets, system eq, phase-matching, a.o.

The Signal Integrity Sensing™ pre-wiring of the LF and MF sections ensures dynamic cable/connector compensation between the LR28 and Sentinel, resulting in a fast and tight mid and bass response, while reducing distortion even further. The system damping factor of 10.000 is maintained, regardless of cable length, gauge or system impedance.

The rigging system enables angle-setting on the cabinets, without lifting the array, resulting in safer and faster set-up with minimal handling. The unique, patent-pending flying system facilitates two different ways of array assembling, caterpillar and pre-rig-style, with compressed and non-compressed suspension. This makes different cabinet/rigging versions obsolete and maintains quick and safe system assembling for even the largest configurations. The rigging hardware is certified for a WLL of 24 cabinets under 10:1 safety.

Philip “Dr. Phil” de Haan, head of Alcons R&D and initiator of multiple patents: “the LR28 is based on the LR24 line-array, which we presented last year, and offers a substantial increase in high-frequency and low-frequency output over its predecessor”
While the output performance of the RBN1402 pro-ribbon platform was already industry-leading, Phil and his team still had some development ideas that they wanted to research further.

Phil continues: “During last year, we developed the RBN04 pro-ribbon platform, our 4th, which offers an astounding sound pressure level increase over the RBN02, our most powerful to date then. With large-scale sound reinforcement seen by us as “Formula1”, we decided to implement this new patent-pending driver technology in the LR24, as you can never have enough horsepower!”

However, in order to gain maximum output increase, also the low-frequency section needed to be revised. In cooperation with the transducer supplier, the R&D team developed a 14” low-frequency transducer that fits the exact same cabinet size as the LR24, so the original acoustic lay-out could be maintained. And thus LR24 became LR28.

Phil concludes: “the response on the LR24 from top engineers around the world was already fantastic, confirming we really offer something that’s not yet available. The LR28 pushes boundaries of the holy grail of sound reinforcement even further: “What You Mix Is What You Get!”

Norwegian rental company Trondheim Lyd is the first LR28 customer worldwide, having purchased a complete package of 32 LR28 line-arrays with 24 BC543 triple 18” cardioid subs plus Sentinel10 amplified loudspeaker controllers.

Click here to go to the LR28 page

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