How L-Acoustics Large-Scale Sound System Design Evolved from V-DOSC to L1

By the late 1980s, concert sound systems could already be extremely large and powerful. But simply adding more loudspeakers did not solve the fundamental problem. When multiple sources reproduce the same material, their wavefronts do not always combine constructively. Depending on position, they can reinforce or cancel each other, altering tonal balance and reducing intelligibility. The larger the system became, the harder it was to control the result.
That is why L-Acoustics’ early research focused less on the output of an individual loudspeaker and more on the coherence of multiple sources. The first experimental DOSC system appeared in 1988. Christian Heil and Professor Marcel Urban then defined the conditions under which individual array elements could couple acoustically and behave as a single extended source. In 1992, the results were presented at an Audio Engineering Society convention. This work became known as Wavefront Sculpture Technology, or WST.

Its practical expression was V-DOSC.

Today, vertical line arrays are so familiar that it is difficult to imagine a major concert without the characteristic curved hangs on either side of the stage. In the early 1990s, however, this represented a fundamental change in system design.

The key idea behind V-DOSC was not simply to suspend multiple enclosures in a vertical line. The system was designed so that adjacent elements would couple acoustically and form a coherent wavefront. For the high frequencies, a dedicated DOSC waveguide was developed to create the required wavefront geometry. This allowed the array to be treated as one extended source rather than a collection of independent loudspeakers.

That changed more than the appearance of concert systems. It gave engineers much greater control over where acoustic energy was directed.
Instead of trying to fill a venue by simply adding more output, system designers gained a tool for shaping audience coverage. The result was greater throw, more consistent SPL and a more predictable system response. V-DOSC effectively established many of the principles that still underpin modern line array design.

The next major shift came not only in the loudspeakers themselves, but in the way systems were designed.

In 2004, L-Acoustics introduced Soundvision. Until then, designing a large touring system relied heavily on engineering experience, calculations and on-site measurement. Three-dimensional modelling made it possible to visualise coverage geometry and predict array behaviour before the system was flown. In other words, the sound system was gradually evolving from a collection of hardware into a predictable engineering model.
Then came K1 in 2008.

If V-DOSC demonstrated the viability of the line source principle, K1 extended it to the scale of the world’s largest touring productions. It delivered greater output, larger scale and, importantly, more precise low-frequency control. With K1/K1-SB, L-Acoustics introduced integrated cardioid behaviour into a large-format line source system, improving control of low-frequency propagation. More than fifteen years later, K1 remains one of the reference systems for major tours and festivals.

But over time, the question engineers were asking began to change.

In the 1990s, it was essentially:
How do we make many loudspeakers behave as one coherent source?

Later, it became:
How do we make that source more powerful and more controllable?

Today, the challenge is evolving again:
How can we achieve the same scale with less hardware, while gaining even greater control over energy distribution?

That shift is clearly visible in the latest generation of L-Acoustics systems.

With L2 in 2023 came the PULS architecture, Progressive Ultra-Dense Line Source. The concept moves beyond the traditional approach of assembling a long array from many identical enclosures. Instead, a dense group of transducers is integrated into an optimised radiating surface, allowing directivity to be managed more precisely within the system itself.

In 2026, L1 extended that concept further.

In one sense, L-Acoustics engineers are still addressing the same problem Christian Heil was exploring more than three decades ago: how to make many transducers behave as one source. The difference is the level of power density, computational precision and control now available.
One of the key objectives behind L1 is to maintain consistent coverage at very large scale through high power density and a highly efficient radiating surface.
That makes the story of the past forty years rather interesting.

Professional sound has moved from vast “walls” of loudspeakers to systems in which array geometry, transducer placement, amplification, prediction software and signal processing are designed as parts of a single architecture.

Enclosure dimensions changed. Amplifiers changed. Materials, processing power and software changed.

The physics did not.

And perhaps that is why a photograph of V-DOSC from 1992 beside L1 in 2026 does not really look like a meeting between the past and the future.
It looks more like two different answers to the same question: how do you direct sound to the listener and make the entire system behave as one?