Line Array article
Common Line Array Mistakes to Avoid
Line arrays reward careful deployment and punish careless ones. These are the mistakes that produce systems that sound worse than what they replaced, and how to avoid them.
Line arrays reward careful deployment and punish careless ones more obviously than most PA gear. The mistakes here are not obscure edge cases — they're the ones that regularly produce a system that sounds worse than what it replaced, or that damages equipment that should last a decade. If you're working with one of these systems, knowing where things go wrong is as useful as knowing what to do right.
Skipping the Prediction Software
Every serious line array manufacturer provides acoustic prediction software — L-Acoustics SoundVision, d&b ArrayCalc, Nexo NS-1. These tools exist for a reason: it is genuinely difficult to predict how a vertical column of sources will cover a given audience area without modelling it first. Engineers who skip this step regularly end up with a system that over-covers the front rows, under-covers the back, or wastes output into the ceiling. The software is free, accurate, and takes less time to learn than fixing a bad hang after the crew has gone home.
Wrong Splay Angle Between Elements
The curvature of a line array — the angle between adjacent elements — determines the vertical coverage pattern. Too straight and you get a very narrow beam that hits a small slice of the audience; too curved and the elements stop coupling coherently at high frequencies and the system sounds bright at close range and muddy at distance. The correct splay is derived from the audience depth, the hang height, and the number of elements. Read the prediction software output and use it — do not guess.
Running Without the Correct DSP
Professional passive systems are designed to operate with specific amplifiers loaded with the manufacturer's DSP presets. Running a professional system without the correct DSP — or with an outdated firmware version — removes the protection filters, the EQ alignment, and the time correction that make the system work as designed. In the best case the system sounds poor; in the worst case HF drivers fail under loads they were never designed to handle unprotected. Self-powered systems have DSP built in, which removes this risk — but even these require the correct preset selected for the configuration you're using.
Too Few Elements for the Room
A four-element array that works well in a 200-capacity club does not cover an audience 50 metres deep. Array length determines throw distance and vertical coverage angle. The maths is not complicated: more elements provide a longer array, which produces a tighter vertical beam and greater throw. Using too short an array in a deep room means the back is quiet and often lacking high frequencies. Most manufacturers provide guidelines on minimum array length for given audience depths — follow them.
Neglecting Sub Integration
The main elements of a line array system typically roll off steeply below 60–80 Hz. Running without subwoofers for music is the most audible deficiency possible — the low end that gives music its physical weight simply isn't there. Running with subs that aren't time-aligned is nearly as bad: the sub's output arrives at the audience area at a different time from the main system, which produces a muddy, incoherent low-mid region that is unpleasant to listen to and difficult to mix on. Time alignment is set in the DSP and takes ten minutes to do correctly; it should never be skipped.
Rigging from the Wrong Points or Height
The hang height and position of a line array fundamentally determines its performance. Too low and the geometry forces the system to aim into the floor rather than the audience; too far back from the stage and coverage is uneven across the width. Rigging from unapproved structural points is a safety issue, not merely a sound quality one — arrays can weigh hundreds of kilograms and the consequences of a structural failure are catastrophic. Always verify load ratings with the venue or a structural engineer before hanging anything significant.
Forgetting Nearfield Coverage
A flown array aimed at the back of a room typically leaves the front rows with reduced high-frequency coverage — the closest audience is inside the throw angle of the system. This nearfield gap is a common problem in venues where the rigging point is directly above the front of the stage. Addressing it requires either a fill speaker aimed at the front rows, adjusting the array geometry, or a combination of both. Prediction software shows this problem clearly; it's invisible without it.
For a full technical explanation of how these systems work, the ultimate guide to line arrays covers the physics in detail. For setup fundamentals from the beginning, line array for beginners is the starting point. Buying recommendations at each budget level are in the best systems for the money.
Most Mistakes Are Avoidable
The failures that produce a bad-sounding system are almost always the same: skipped software, wrong geometry, missing or misaligned subs, and inadequate amplification. None of this is mysterious. Use the tools the manufacturers provide, check the basics at each stage, and the system will perform as it should. A well-deployed system in a difficult room will usually outperform a carelessly deployed system in a good one.
Comments