The K2 is the full range element of a WST line source with variable curvature and adjustable horizontal directivity. The K2 loudspeaker enclosure is based on a 3-way active design. It comprises 4 input sections: 2 LF and 1 MF at a nominal impedance of 8 ohms, and 1 HF at a nominal impedance of 16 ohms. It features two 12” speakers and four 6.5”, all direct-radiating neodymium speakers mounted in a bass-reflex enclosure, and two 3” neodymium diaphragm compression drivers coupled to individual DOSC waveguides and adjustable directivity fins. The transducers are implemented in a K-shape configuration. The cabinet is made of machined first grade Baltic birch plywood combined to die cast aluminum side panels to ensure maximum acoustical and mechanical integrity while reducing weight to the minimum. A four-point rigging system is integrated into the cabinet.
The K2 enclosure operates over the nominal frequency range of 35 Hz to 20 kHz. Its LF resources can be reinforced with the dedicated K1-SB extension and its bandwidth can be extended down to 25 Hz with the SB28 subwoofer. In the horizontal plane, the directivity is adjustable down to 300 Hz, with two symmetric settings (70° or 110°) and two asymmetric settings (90° as 35°/55° or 55°/35°).
The K2 rigging system allows vertical assembly of enclosures with various inter-element angles (up to 10°), constituting a line array with variable curvature. The combination of the coplanar symmetry and the DOSC waveguide in the HF region ensure a perfect acoustic coupling between the elements of an array. The WST (Wavefront Sculpture Technology) criteria are fulfilled, so that such an array can be qualified as a true line source. Any WST line source provides a smooth tonal response and a coverage that is free of secondary lobes over the entire frequency range.
The K2 is driven and quad-amplified by the LA8 or LA4X controller with factory presets which ensure linearization, protection, and optimization for the loudspeaker system.
The SB28 enclosure is a recommended Subwoofer companion for the K1, KUDO, L-Acoustics V-DOSC and ARCS systems, lowering the combined system operating range down to 25 Hz.
The SB28 contains two 18'' direct radiating LF transducers integrated into a bass-reflex tuned enclosure.The specially designed 18'' transducers provide an exceptional cone excursion capability combined with low thermal compression even at the very highest operating levels. The bass-reflex vents feature a progressive profile allowing laminar airflow. The association of the modern components with the new vents delivers a greatly improved +5 dB peak SPL output compared to the previous standards.
The control and amplification of the SB28 is managed by the LA8 platform.The DSP filtering encompasses advanced crossover functions, system EQ, and L-DRIVE thermal and overexcursion protection of the transducers. The L-Acoustics LA8 amplified controller offers the following drive modes:
- The ''standard'' mode using SB28 as a companion to K1, KUDO, L-Acoustics V-DOSC and ARCS, featuring a low-pass filter at 60 Hz ([SB28_60] preset) or closely coupled to ARCS with a low-pass filter at 100 Hz ([SB28_100] preset)
- The ''cardioid'' mode using SB28 as a companion to K1, KUDO, L-Acoustics V-DOSC, and ARCS, featuring a low-pass filter at 60 Hz ([SB28_60_C] preset) or closely coupled to ARCS with a low-pass filter at 100 Hz ([SB28_100_C] preset)
The performance of the SB28 enclosure depends upon the choice of preset and physical system configuration.
Made of high grade Baltic birch plywood, the cabinet also features industry standard Aeroquip rails for line array rigging.
The LA8 amplified controller belongs to the new generation of high-end integrated controllers entirely dedicated to the comprehensive operation of L-ACOUSTICS loudspeaker systems. The LA8 combines in a 2U lightweight chassis the resources of a 2 x 4 DSP engine driving four channels of amplification delivering up to 1800 W each, a storage capacity of 99 presets, a user-friendly front panel interface, two I/O Ethernet connection ports for network remote control, a connection panel for audio inputs and speaker outputs, and a digital I/O audio network optional slot.
- Cutting edge loudspeaker amplification, DSP, network
- High-grade 24 bit A/D converters, 130 dB dynamic range
- 96 kHz/32 bit floating point SHARC DSP
- 4 channel high efficiency amplifier section fed by 2 inputs
- LA4: 4X1000W/4 Ohms, LA8 4X1800W/4 Ohms
- Advanced dual IIR/FIR filter algorithms
- Exclusive L-DRIVE system protection
- Complete onboard L-ACOUSTICS preset library
- LA NETWORK MANAGER 2.0 PC software for remote control & monitoring
- AES/EBU Standard on LA8 and LA-RAK
Proprietary algorithms are processed in a 32-bit floating point DSP engine at a 96 kHz sampling rate. A dedicated engineering approach combining IR and FIR filters allows generating perfectly linearized phase curves and significantly improved impulse responses for an even more natural, transparent, and realistic sound experience. Two cascaded 24-bit A/D converters at the front-end yield a ground-breaking encoding dynamic of 130 dB. The L-DRIVE protection system carries out a dual analysis of signal level in real-time and RMS. Under extreme conditions when component membranes reach the over-excursion zone or if the coil ensemble temperature reaches a critical point, L-DRIVE acts as a power regulator. As a result the amount of power delivered at any channel is adjusted to the dynamic and thermal capacity of each individual transducer. This optimizes the power resources while preserving the highest dynamic range. With a complete preset library and the possibility of creating additional user presets, the engineer is offered fingertip access to all the usual L-ACOUSTICS loudspeaker system configurations.
The four amplifier channels driven by two inputs provide optimum system flexibility. The LA4 and LA8 offer two specific power ranges (4 x 1000 watts into 4 ohms, and 4 x 1800 watts into 4 or 2.7 ohms, respectively) yielding perfect power matching to each individual L-ACOUSTICS loudspeaker system. The built-in technologies allow control of the very wide dynamic range found in live audio productions while the high-efficiency components offer superior reliability, all from a sleek ergonomic package with exceptional weight/size ratio.
The front panel user interface features extremely fast access to edit the 2 input and 4 output settings. The encoder wheel gives instant access to the user menus and the LCD screen offers real time visualization of the system parameters. Command access includes mute, gain, preset selection, plus delay and polarity settings. Navigation through the menu pages is fast and intuitive. Beside the standard on-board preset library, the engineer can design and store his own settings (initialized from a standard preset template) in one of the 10 available user locations