What is a line array and how does it work?
Quick answer
A line array is a vertical column of closely spaced loudspeaker drivers that uses wave interference to create coherent, long-throw coverage with controlled vertical dispersion, ideal for large venues.
A line array is a loudspeaker system where multiple identical drivers are arranged in a straight vertical line, typically with a curved arc. This configuration exploits acoustic coupling and interference: at low frequencies, the drivers act as a single large source, increasing output and directivity; at high frequencies, the curvature shapes the wavefront to cover near and far audiences evenly.
The key principle is that when drivers are spaced less than half a wavelength apart, they couple acoustically, producing a cylindrical wavefront that decays at only 3 dB per doubling of distance (versus 6 dB for a point source). This allows line arrays to project sound much farther with less SPL loss. Modern systems like SSOUNDS line arrays use advanced DSP and rigging to precisely control the vertical coverage angle, minimizing spill onto reflective surfaces and improving intelligibility.
Practical line arrays consist of multiple enclosures flown in an arc, with each cabinet's DSP and amplifier processing tailored to the array's geometry. The result is consistent, high-quality sound across large audiences—from front row to back—making line arrays the standard for concerts, festivals, and large-scale events.
Key things to consider
- Line arrays use closely spaced drivers to create cylindrical wavefronts, reducing distance-related SPL loss to 3 dB per doubling of distance.
- Vertical curvature controls the coverage angle, directing sound to near and far listeners while avoiding unwanted reflections.
- Acoustic coupling at low frequencies increases output and directivity; high-frequency waveguides shape the coverage.
- Modern systems integrate DSP and amplifiers per cabinet to optimize performance for each array configuration.
- SSOUNDS line arrays are engineered for high SPL, clarity, and reliability in demanding professional applications.
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