High-performance ultra-compact line-array system


High-performance line-array system

■ Ultra-robust multiple-patented pro-ribbon transducer technology
■ 1:1 non-compressed linear sound reproduction, with up to 90% less distortion
■ Unique fully symmetric and coherent horizontal and vertical pattern control
■ Next-gen woofers with FlowVent™ loading for full-range performance
■ Fully integrated solution with processing & amplification, rigging & transportation
■ Future-proof for excellent return on investment

The LR15 is a 2-way, “ultra-compact” format line-array sound system, combining the highest sound quality possible with high SPL capabilities and throw in a very compact form factor.

By utilizing next-generation driver technology, together with new developments such as FlowVent™ and VHIR™ and new simulation methods, the system is designed to enable a 1:1 non-compressed reproduction of the original sound source with a completely neutral response. As such, it can be used for any application possible, from speech, to classical music, jazz, all the way to pop and rock performances.

Combined with a range of mounting and deployment options, and also the company’s renowned very long product lifecycle, the system offers a unique performance under utmost flexibility for the highest return-on-investment.

LR15 system shares the exact same high resolution proprietary transducer, amplification and processing technologies with its larger siblings LR18, LR24 and LR28. This offers one single, scalable audio reference: One reference; One experience.

The power behind the glory

Conveying emotions through the pro-ribbon transducer

The heart of the LR15 system is the purpose-designed RBN502rs 5” pro-ribbon transducer. By implementing Alcons’ pro-ribbon technology for mid and high frequencies, a very-fast impulse response with up-to-90% less distortion is achieved. This enables the LR15 to offer an intuitive linear response, with excellent intelligibility and non-compressed identical tonal balance at any SPL.

The all-natural cylindrical wavefront of the multiple-patented and purpose-designed RBN502rs 5” pro-ribbon transducer with 5” voice-coil and the symmetrical component configuration bring a natural, unique pattern control in both the vertical as well as the horizontal plane up to the highest frequencies.

The consistent horizontal dispersion extends the imaging sweet-spot to a larger audience; The ultra-coherent vertical dispersion enables a perfect inter-cabinet coupling for ultimate HF throw and wind stability.

The ear-catching intelligibility and remarkable dynamic headroom reserve is due to the RBN502rs’s 5" voice-coil with copious power handling of 1100W and RMS-to-peak power handling ratio of 1:15, from 1 kHz to 20 kHz.


Razor-sharp directivity control

The constant horizontal directivity of the electronically and acoustically symmetric 2-way system, with an excellent off-axis frequency response. This not only guarantees audiences to get the same experience, regardless of position, but also offers a consistent reflected diffuse-field, resulting in a very coherent room sound response, both direct and reflected.

The vertical directivity shows a fully coherent wavefront up to the highest frequencies: This unique “perfect needle pin” cylindrical behavior prevents spilling energy above (ceiling) and below (on-stage) the array.

The resulting lack of destructive inter-cabinet interference also results in an unsurpassed throw efficiency and remarkable wind stability.

Unique ultra-low distortion 1:1 sound reproduction

The Alcons proprietary mid and high frequency technology in the LR15 offers a 1:1 non-compressed sound reproduction, with up to 90% less distortion than any conventional mid/high transducer (@ same SPL), because of the lack of a compression chamber and the light weight diaphragm (with large integrated voice-coil).

The RBN pro-ribbon mid-high frequency drivers reproduce the original sound without adding any coloration or distortion. Input = output, just louder!


Industry reference


Alcons RBN502 Pro-Ribbon

LR15 'under the hood'


Patented 5" pro-ribbon Neo HF driver with 5" voice-coil and 1100W peak power handling.

Woofer 6.5__1080_SQUARE

Double 6.5" Neo LMF drivers with dual voice-coils, extended excursion and ultra-low distortion.


Acoustically and electronically symmetrical component configuration.


Passive-filtered for simpler infrastructure and economical powering while guaranteeing maximum output.

LR15_phase response

VHIR processing provides for a flat phase response with ultimate fidelity


Easy-to-operate rigging system, WLL of 18 cabinets under 10:1 safety.

LR15 system and peripherals

An integrated system approach, not just assembled parts

The LR15 is part of a complete, application­configurable package; a synergetic toolbox of line­array modules, different stacked or flown subwoofer principles, dedicated power and processing platform with ALControl™ remote-control, power-, signal- and transport logistics and high-resolution ARC™ 3D-simulation software.

Line array module

The LR15/90 is a 2-way, passive ultra-compact line-array module. lt contains the RBN502rs pro-ribbon transducer for mid and high frequencies and double 6.5" for the low/mid frequencies with FlowVent™ loading. The system has a horizontal dispersion of 90-degree and a vertical dispersion of 15-degree (single element).

Line array module

The LR15/120 is a 2-way, passive ultra-compact line-array module. lt contains the RBN502rs pro-ribbon transducer for mid and high frequencies and double 6.5" for the low/mid frequencies with FlowVent™ loading. The system has a horizontal dispersion of 120-degree and a vertical dispersion of 15-degree (single element).

Flyable Subwoofer

The LR15B flyable LR15 matching subwoofer features a next-gen, ultra-low distortion 15” woofer with extended excursion. It can be used as single subwoofer or in multiples; In end-fire or cardioid array configurations, also flown above or behind the LR15 array; All (!) functionality is possible in stacked or flown configurations bringing ultimate deployment versatility

Cardioid Subwoofer

The BC543 self-contained cardioid subwoofer, with 3x 18" very high-output carbon-cone woofers, offers selectable cardioid low-frequency pattern control and excellent rear rejection (up to 42dB), in combination with the dedicated drive processing in the Sentinel.

Amplified loudspeaker controller

The Sentinel is the “engine” for the LR15 system; A 4-in/4-out dedicated DSP drive processor, with 192kHz capable AES3 inputs, touch screen and multi-color encoder control and 4 audiophile amplifier stages totaling more than 10kW of output power. Signal Integrity Sensing™ dynamic cable-length compensation, auto-redundant power supplies, modular amp/SMPS design.

Touring rack

The AST3 (Armored Sentinel Transporter) flyable touring rack contains everything required to drive the LR15 system to its fullest capacities. It contains three Sentinel10 amplified loudspeaker controllers, together with the 1HE input/network signal distribution panel (XLR, EtherCon), the 2HE output signal distribution panel (NL8, NL4) and a three-phase power distro unit.

Remote control software

ALControl™ is Alcons’ proprietary ALC software program, to control and monitor individual or multiples of Sentinel amplified loudspeaker controllers, that can be accessed from anywhere within a network. Features include off-line, pre-production configuration, auto-detect, extensive monitoring and control options and auto-update.

Simulation software


ARC™ (Alcons Ribbon Calculator) is the GLL-based simulation software for the Alcons array systems. Based on actual system measurement output data, the high measurement resolution (up to 1-degree accuracy) offers horizontal + vertical modelling, turning the LR15 into a true precision tool.

LR15 Specifications

Dimensional drawing

Technical specifications

Frequency response: 74 Hz - 20.000 Hz (+/- 3 dB)
53 Hz - (+/-10 dB)
Sensitivity nominal: 99 dB (200 Hz - 10 kHz)
Nominal impedance: 8 ohms
Recommended drive: Sentinel10, max. 3 pcs.
per channel (2.7 ohms)
Nominal SPL peak: 125 dB (Sentinel3 200 Hz - 10 kHz)
131 dB (Sentinel10 200 Hz - 10 kHz)
Dispersion H x V (array) 90 or 120° x depending on
array length
Dispersion H x V (single) 90 or 120° x 15° (@10kHz)


Physical specifications

System: 2-way, full-range
Filtering: passive
Drivers LF: 2x AW65.22ND-16 6.5”, vented
Drivers HF: 1x RBN502rs 5” pro-ribbon driver
Connectors: 2x Speakon NL4 input/link
Physical dimensions:      mm              inches
Height:      176                6,9
Width:      580                22.8
Depth:      333                13,1
Weight:        14 kg            30,9 lb
Warranty: 6 years limited

Due to Alcons Audio continuous R&D, all specifications are
subject to change, without prior notice.

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