Vertical -6dB coverage

The medium sized array (left) has significant output to ±90º whereas the large array’s ±90º output is dramatically reduced.

A note on coverage nulls

It is useful to be able to calculate where these first response nulls will occur for various frequencies as they indicate areas where coverage, transient response and directional information would be poor without fill systems. For symmetrical arrays nulls will occur either side of the on-axis line. We can calculate the overall “null-to-null” angle using the simple formula:

As a very rough guide, the null-to-null angle will be approximately twice the -6dB coverage angle.

Interpreting polar plots

i)It is conventional to “normalise” polar plot on-axis amplitudes so that different polar shapes may be readily compared. In practice, the large array (right example) would have a higher on-axis amplitude than the medium array.

ii)It is also conventional to plot polar amplitudes on a logarithmic scale. This is fine when working in sound pressure level terms but is not suitable for superimposing a polar plot onto a venue plan. Venue plans are drawn to a linear scale so polar plots with linear amplitude scales would be more suitable.

iii)Polar plots have been simplified in this article for clarity. Real-world off-axis lobe amplitudes and shapes would vary considerably depending on boundary loading, echoes, reverberation and other audio sources affecting the same space.

The following table gives the approximate vertical coverage angles of typical WLX/WLXGS arrays - ignoring boundary effects (see later).

WLX/WLXGS High		Vertical coverage
	47Hz	94Hz	188Hz
3	Wide	Wide	98º
4	Wide	Wide	69º
8	Wide	69º	33º
16	69º	33º	16º

Use tall stacks for long shots. Useful for long distances in low-roofed venues with raked seating up to the height of the stack.

Use short stacks for short, wide vertical shots.

Use tall, electronically steered, stacks to project to high, distant seating – see later.

Vertical Boundary effects

As mentioned before, a solid floor will act as a reflector. This will cause a vertical stack to perform as if it were double the length, giving a useful low frequency boost and a narrower vertical polar response.

WLX, WLXGS specifications

The Martin Audio WLXGS and WLX line array systems represent a remarkable advancement in professional audio technology, providing powerful and precise sound reinforcement for various applications, from concerts to corporate events. These systems are part of Martin Audio's commitment to delivering high-performance sound solutions that are both reliable and easy to use.

At the heart of the WLXGS and WLX systems is their innovative design, which integrates advanced acoustic engineering with cutting-edge materials. The WLXGS, as a ground stack subwoofer, features two 18-inch drivers, which are optimized for deep bass response and efficiency. This design ensures that the low-frequency output is not only impactful but also well-controlled across a wide spectrum of environments. The WLX model, on the other hand, is designed for array applications, offering extreme versatility and scalable configurations suited for varying audience sizes.

One of the standout features of both the WLXGS and WLX systems is their ability to deliver exceptional sound quality. With a frequency response that extends from deep bass up through the midrange and treble frequencies, the systems maintain clarity and detail no matter the sound pressure level. This is crucial for live sound applications where vocal intelligibility and instrument clarity are essential.

The technology used in these speakers is also noteworthy. Martin Audio has employed its proprietary Optimized Digital Signal Processing (DSP) technology, which allows for precise tuning and control of sound characteristics. This technology helps mitigate issues such as interference and feedback, ensuring that the sound remains consistent and professional throughout an event.

Additionally, the WLXGS and WLX systems are designed for ease of deployment. The lightweight construction, combined with integrated rigging and stacking features, allows for quick setup and teardown, making them ideal for touring as well as fixed installations. The systems include integrated handles and optional accessories that facilitate transport and arrangement, making them user-friendly for audio engineers and technicians.

In conclusion, the Martin Audio WLXGS and WLX systems bring together powerful performance, innovative technologies, and practical design. Their combination of deep low-frequency output, clarity, and ease of use makes them a top choice for professionals in the audio industry, ensuring that audiences experience music and sound as intended by the artists and producers. Whether for large-scale events or intimate gatherings, the WLXGS and WLX deliver reliable performance that meets the high standards of modern sound reinforcement.

Martin Audio manual Vertical -6dB coverage, WLX/WLXGS High Vertical coverage 47Hz 94Hz 188Hz

Models: WLX WLXGS

Interpreting polar plots