Line source array systems have become the mainstream system in the field of sound reinforcement. Both the mobile performance system and the fixed installation system benefit from this line array configuration.
Linear array systems have been described in detail in earlier literature, and today professional system designers and operators have more choices. Although the linear array characteristics described by different vendors are slightly different, most system designs are based on the original research theories of the pioneers of the first half of the 20th century.
With regard to simple column loudspeakers, in 1930 Wolfe and Malter first discovered that vertical array projections produced greater directivity in the vertical plane. In 1940, Olson discovered through the study the interaction of three main variables (number of sound sources, spacing of sound sources, wavelength of frequency), the narrower the acoustic beam becomes when the frequency is higher, which is later called the line array effect. .

The geometric arrangement in a two-way loudspeaker consisting of three drive units does not cause sidelobe problems.

Figure 1: The VUE al-series loudspeakers minimize off-axis sidelobe and off-axis effects through an axially symmetrical horn arrangement (according to the 1983 D'Appolito theory).
D'Appolito explained in 1983 that in the two-way system, the intermediate frequency and high frequency units are arranged in an axially symmetric horizontal arrangement to eliminate the off-axis blank area, even by adding a pair of low-frequency units on both sides. This principle extends to the use of three-way systems. The introduction of this theory has led to the expansion of large-scale system design and line array systems into a wider range of commercial applications. Today, we also need to select the drive unit and the optimized crossover and make a reasonable layout within the cabinet to improve the directivity effect in the specific coverage area of ​​the existing system.
The lineup systems of most audio manufacturers have similar appearance and performance. However, at the system design level, the electroacoustic theory embodied behind different products is quite different. Kossiakoff, Sweet, Seymour, and Biemer mentioned in 2011 that advances in technology require inherent competition (including evaluation of design optimization) and specialization of the internal parameters of the system to rationally lay out structural unit components. Strictly control the interactions and effects between components.

These differences and trade-offs depend primarily on the designer's considerations. An efficient system engineering is based on solutions to the design challenges that have been explored, and a deep understanding of the real world is an inevitable element of success in systems engineering. Thanks to the extensive experience in practical applications, the VUE Audiotechnik product engineering team is extremely knowledgeable about the most likely system failure modes in extreme use situations. These experiences and knowledge point the way for the development of the VUE al-series expandable line array system.
1. VUE Design Principles Guide

Acoustic units and auxiliary electronic components in the Al-series are designed and manufactured in accordance with specific principles guidelines. Includes: a. Intuitive user interface; b. Integrated digital signal processor and amplifier module; c. Rugged and specially designed speaker unit; d. Stable acoustic performance; e. Easy-to-operate hardware accessories and tool.
VUE is committed to applying these principles to create unique and practical systems. This is achieved in reality by establishing theory combined with actual new product development models.
Understanding and resolving the gap between theory and practice runs through the entire development process of VUE. As proposed by Krishnan and K. Ulrich in 2001 (5), in the field of product development, a similar engineering framework can make products more profitable. From product strategy and planning to supply chain management to failure mode analysis of components, it is this commitment to system-level reliability that enables VUE Audiotechnik products to meet the most demanding customer requirements.
One of the basic system development techniques in the VUEAudiotechnik product development project is the large signal design. When a VUE customer uses a system product in a performance sound reinforcement environment, the power will reach a high level in the case of a large signal, and the potential nonlinear effects that may occur in each component of the system must be considered.
It is important for system engineers to understand and overcome potential failure modes at the component and system levels, whether in research and development laboratories or in real-world applications (such as concerts, music festivals, etc.). Familiarity with potential failure modes allows VUE engineers to take decisive action during the design phase. For example, which components or technologies are powerful enough to be shared across different products? How to optimize cost and performance?

Figure 2: VUE's al-series line array system uses a unique electro-acoustic technology platform.

Ultimately, the R&D model of the VUE system platform led to an important technical concept – the perfect integration of acoustic output with a multi-cassette array.

This concept clearly illustrates the unique technical characteristics of VUE Audiotechnik's al series line array products, when combined with different models. In fact, the newly developed al-12 dual 12-inch 3-way speaker can be combined with the slightly smaller size of al-8 and al-4.

Figure 3 The al-12 dual 12-inch three-way speaker is the newest member of the al series.

To be continued...

About VUE Audiotechnik

With a persistent pursuit of technological innovation and an indestructible partnership, the VUE Audiotechnik team gathered in 2012. The founders of VUE have accumulated more than 100 years of experience and have been the leaders behind the success stories of many famous professional audio brands. From the sound design that subverts tradition, set the tone for today's industry, to the development of modern sound reinforcement giants, the VUE team has shown its own aura in the professional audio industry. Since its inception, VUE has developed rapidly and is quickly recognized by the market. Although it is an emerging brand in the professional audio industry, VUE has been recognized as a leader in innovation. For more success stories about VUE, please visit

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