Subwoofer Technology

In 2004 L-ACOUSTICS® introduced a new diffraction model, the DED. The Distributed Edge Dipole was published in the AES journal and provides a logical, predictable methodology for low frequency sound design. The DED model describes how a part of the wave produced by the speaker spreads toward the cabinet edges where it is diffracted with group delay and phase inversion. The DED model is implemented for modeling the physics of cardioid applications and the size of enclosures.

The latest subwoofer design incorporates a vent with a progressive profile and ultra-low vibration walls for a significant gain in peak SPL, laminar airflow and drastic reduction of turbulence noise.

L-ACOUSTICS® subwoofers benefit from the latest acoustic, signal processing and component innovations and deliver an exceptional level of performance while offering multiple modes of operation, whether on the road or in fixed installations.
 
    SB15m subwoofer
    SB15P subwoofer
    SB18 subwoofer
    SB18i subwoofer
    SB18m subwoofer
    SB28 subwoofer
   

The SB28 enclosure is a recommended subwoofer companion for the K1, KUDO®, 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®, 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®, 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.

• Reference subwoofer, LF limit 25 Hz

• Amplified controllers with DSP library and networking capabilities
• Touring rack
• Remote control software

• 3D electro-acoustic and mechanical simulation software dedicated to L-ACOUSTICS products

• Audience : 10 000
• 2 x 12 V-DOSC
• 2 x 8 SB28 FOH

• Audience: 15 000
• 2 x 12 K1 & 6 K1-SB & 12 SB28 FOH

• Audience: 130 000
• 32 x SB28 FOH at each corner of the stage stacked in a cardioid pattern

• Audience: 40 000
• 2 x 15 V-DOSC & 3 dV-DOSC FOH
• 2 x 16 SB28 FOH

• Audience: 40 000   
• 2 x 16 V-DOSC FOH
• 2 x 16 SB28 FOH