When to Choose a Line Array for Corporate Spaces

Why line arrays are specified even where they do not belong

Line arrays have a reputation for being the best sound system money can buy. You see them at major concerts, stadiums and the largest congress halls, and that association often carries over into projects where they do not belong. Many people simply perceive a line array as a better loudspeaker and therefore a logical upgrade for any project that can afford one.

A line array is a specialised tool designed to solve one specific problem: delivering consistent and sufficiently loud sound over a long distance from the loudspeaker. Outside this scenario, it provides no inherent advantage. In a space that does not need one, it may even make coverage worse while costing significantly more.

What is a line array? It is a system consisting of several identical loudspeakers arranged vertically above one another so that they work together to create a continuous sound wave. This wave retains its energy over a greater distance and can be directed precisely in the vertical plane. It is a solution for deep spaces and large audiences, not a universal upgrade for conventional sound reinforcement.

How a line array differs from a point-source loudspeaker

A point-source loudspeaker behaves as a sound source located at a single point. Sound spreads from it into the room and loses level relatively quickly with distance. For most spaces, this is perfectly acceptable. When the audience is within a reasonable distance, one or several point-source loudspeakers can cover the room evenly because the decrease in level is predictable and can be managed during system design.

The problem arises when a room is very deep and sound must travel over much greater distances. A point-source loudspeaker adjusted so that the last row receives sufficient level will be too loud for the first rows. This creates uneven coverage that becomes increasingly difficult to solve as the room depth increases.

This is exactly the problem a line array is designed to solve. It consists of multiple drivers arranged vertically, creating a more continuous wavefront instead of behaving like a single point source. The sound retains energy over a significantly greater distance and loses level more gradually. The coverage can also be shaped precisely. By curving the array and configuring the individual elements, sound can be directed towards the audience while minimising energy directed at the ceiling or rear wall.

The result is more consistent coverage. The difference in sound level between the first and last rows is reduced and speech intelligibility remains high across the full length of the hall. This advantage only becomes relevant, however, when the room is genuinely long. In a short hall, a line array has no problem to solve because the problem it was designed for simply does not occur.

Three technical requirements that must all be met

A line array makes sense when three conditions apply simultaneously. All three must be met. If any one of them is missing, the system will either provide no meaningful advantage or cannot be installed correctly.

Sufficient room depth

This is the first and most important requirement. A line array generally becomes relevant in spaces with a depth of more than approximately 25 to 30 metres. At these distances, a point-source system may no longer provide sufficiently even coverage and its limitations become more apparent.

Below this range, the situation is usually the opposite. Up to approximately 20 metres, a point-source loudspeaker or a combination of several point-source loudspeakers can often cover the room better, more simply and at a lower cost.

Sufficient height for suspension

A line array must be suspended. To create the correct wavefront and direct it towards the audience, the array must hang sufficiently high above listener level. It therefore requires enough clear space above the audience.

A low ceiling height can rule out a line array even when the room itself is sufficiently deep.

A genuine requirement for sound pressure level and consistency

The third condition concerns how the room is actually used. A line array is justified where there is a large audience and where it genuinely matters that the sound level remains consistent from the first row to the last.

If the room is used mainly for speech reinforcement for a medium-sized audience without demanding sound pressure requirements, this condition may not be met. Even in a relatively deep hall, another solution may therefore be more appropriate.

When you do not need a line array and what to use instead

Depth, height and a genuine performance requirement. Only when all three conditions are met at the same time is a line array technically justified.

Up to approximately 20 metres of room depth, a point-source system will usually do the job and do it more economically. The same applies to a hall that may be deep but has a low ceiling, or to a room intended mainly for speech reinforcement for a medium-sized audience. In these cases, a line array brings a more complicated installation and higher cost without delivering a meaningful improvement in coverage.

There is also an option between a conventional point-source system and a large line array. Compact column arrays use a similar principle of controlled sound directivity and are suitable for medium-sized spaces, particularly rooms with longer reverberation times. They do not replace a large line array in halls with substantial depth and large audiences.

If someone specifies a line array for a room where one of the three conditions is missing, it is worth asking why.

What additional requirements a line array involves

When a space meets all three conditions, it is important to understand that a line array is an entire system package, not simply a more expensive loudspeaker. It is suspended and therefore requires certified rigging points and an assessment of the ceiling structure. In existing halls, this is often the biggest limitation and can sometimes make a retrofit installation impossible.

System design and calibration are also more specialised and time-consuming than with a point-source system. The equipment itself is significantly more expensive because it includes more drivers, more powerful amplifiers and additional processing. When the room genuinely needs a line array, these additional costs are justified.

Frequently asked questions

At what hall length does a line array make sense? A useful rule of thumb is a room depth of more than approximately 25 to 30 metres. Beyond this distance, a point-source system may no longer cover the hall evenly enough, and the difference in level between the first and last rows becomes difficult to resolve satisfactorily. Up to approximately 20 metres, a point-source loudspeaker or a combination of point-source loudspeakers will usually cover the room better and more economically. Room length alone is not enough, however. Sufficient suspension height and a genuine requirement for sound pressure level must also be present.

How much more expensive is a line array than a point-source system? The exact figure depends on the room size and configuration, but the difference can be substantial. A line array requires more drivers, more powerful amplifiers and processors, as well as rigging and a more demanding design process. This is precisely why it should not be specified simply as a precaution. If the room does not take advantage of its benefits, it can become one of the most expensive unnecessary items in an AV project.

Is there a smaller line array for medium-sized halls? Compact column arrays are available and operate according to a similar principle. They are suitable for medium-sized spaces, particularly rooms with longer reverberation times where controlled directivity is beneficial. These are independent system solutions rather than simply smaller versions of large-format line arrays. Where substantial room depth and a large audience must be covered, they do not replace a full line array. Whether a compact array is suitable should be determined using a coverage simulation for the specific room.

Is ceiling height really a limiting factor? Yes. A line array only works correctly when it is suspended sufficiently high above audience level. It needs enough space for its wavefront to develop correctly and be directed towards the audience. In a hall with a low ceiling, this principle cannot be applied properly even if the room is otherwise sufficiently deep. Height is just as strict a requirement as depth.

Does a line array require structural work? Yes. The system is suspended and requires certified rigging points as well as an assessment of the ceiling structure. In a new building this can be addressed during the design stage, while in an existing hall it is often one of the biggest limitations. In some cases, the structure may make a retrofit installation impossible. Suspension options should therefore be verified before deciding on the type of sound system.

How can you determine whether a room needs a line array? The decision should be based on calculations and a coverage simulation for the specific room rather than on a comparison of catalogue specifications. The simulation considers the dimensions of the hall, suspension height, audience layout and required sound level. The result is a coverage map showing whether a point-source system is sufficient. This is also documentation that can be requested from the supplier before making a purchasing decision.