Rain has a sense of humor. It waits until the line array is flown, the amplifier racks are powered, and the headliner is thirty seconds from walking on, then it arrives sideways. This composite story follows one such soaking and gathers the practical wisdom that outdoor sound crews learn the wet way.
The Forecast That Lied
Imagine a summer festival, a main stage PA built from L-Acoustics K2 cabinets and KS28 subwoofers, with delay towers scattered across a field. The forecast promised a ten percent chance of showers. At 8:40 p.m., ten percent became a wall of water, and the PA began to look less like a sound system and more like a decorative fountain.
Outdoor shows are at the mercy of weather, and the history of outdoor sound is a history of improvisation. At Woodstock in 1969, a legendary storm interrupted the festival and soaked the stage, while Bill Hanley’s custom sound system, one of the most advanced of its era, was protected by tarps and tenacity. Every generation of crews has relearned that water and electricity do not negotiate.
What Water Actually Does
Rain damages equipment in several ways. Direct ingress into cabinets can soak drivers and crossovers. Humidity corrodes connectors, circuit boards, and amplifier modules. Short circuits occur when moisture bridges power connections. Even without immediate failure, condensation inside amplifier racks can cause delayed faults, appearing hours or days later.
Modern line array cabinets from L-Acoustics, d&b audiotechnik, Meyer Sound, and Adamson are designed for outdoor use, with weather-resistant coatings, marine-grade plywood or composite enclosures, and protective grilles. Many carry IP ratings such as IP55 or higher, meaning protection against dust and water jets. But ratings are not magic: connectors, rigging points, and amplifier electronics may be less protected than the cabinet itself.
The Sacred Order of Protection
Weather protection starts with design. Use stage roofs with wing extensions to cover PA hangs, and position delay towers under canopies where possible. Place amplifier racks under cover, ideally in dry trailers, tents, or FOH enclosures, with ventilation to avoid overheating.
Cover cabinets with rain jackets or PA covers made of vinyl or ripstop nylon, available from Rose Brand, Gator, or specialist makers. Seal connector panels with weatherproof boots and gaffer tape or self-amalgamating tape. Elevate cables off the ground with cable ramps, and keep connections in waterproof enclosures. Neutrik offers weatherproof speakON and powerCON variants, designed for harsh conditions.
The Console and Front-of-House Problem
The FOH position is vulnerable. Build a tent or riser with waterproof flooring, side walls, and drainage. Place consoles like DiGiCo, Avid, or Yamaha on elevated platforms, never on wet ground. Protect them with console covers and umbrellas, and keep towels nearby. Use a UPS and surge protection, since wet power distribution may trip breakers.
Practical tip: store desiccant packs inside console cases and silica gel near sensitive gear. After the show, dry equipment slowly in a ventilated space. Never power up wet gear. Allow hours, or a full day, to dry, and inspect for moisture.
Electrical Safety: The Part That Kills
Water and mains power can kill people. Use GFCI or RCD protection on all outdoor circuits, with ground fault devices rated appropriately. Keep power distribution off the ground and under cover. Camlock connectors and Powerlock connections should be shielded from rain, ideally in enclosures designed for the purpose.
Train crew to recognize hazards: standing water near electrical gear, frayed cables, wet connectors. Establish a stop-work authority so anyone can halt activity in unsafe conditions. Good power technicians, with insulated tools and rubber mats, are worth their weight in gold.
Rain and Sound: Physics Gets Weird
Rain changes how sound behaves. Heavy rain creates background noise and can mask high frequencies. Humidity and temperature gradients alter sound propagation, affecting high-frequency absorption. After a storm, cooler air near the ground can bend sound, shifting coverage patterns.
Engineers adjust with EQ and delay tweaks, using Smaart or Meyer SIM to re-measure. Update atmospheric settings in prediction software such as L-Acoustics Soundvision or d&b ArrayCalc. Wet drum heads and instruments also sound different, and microphones may need extra windscreens and pop filters to handle spray.
Microphones and Wireless in the Rain
Wireless transmitters and in-ear packs are vulnerable. Use plastic bags or protective covers on bodypacks, and consider waterproof lavalier mics for performers who sweat or get soaked. Shure, Sennheiser, and DPA offer moisture-resistant capsules and sealed connectors. Replace windscreens regularly, and carry spares.
Antennas also suffer: wet coax and corroded connectors degrade signal. Use weatherproof antenna enclosures and sealed connectors, and test RF performance after rain.
The Decision to Stop
The most important question is whether to continue or pause. Lightning is the clear trigger: most safety guidelines recommend halting outdoor events when lightning is detected within a certain radius, often around ten miles, and waiting thirty minutes after the last strike. Use lightning detection services and weather radar, and assign a weather officer to monitor.
The history here is sobering. The 2011 Indiana State Fair stage collapse and other weather-related incidents have shaped industry guidelines, and standards like ANSI E1.21 call for written weather plans and clear decision authority. No show is worth a life.
How the Soaked Show Survived
In our composite festival, the crew pulled rain covers over the subwoofer stacks, lowered the delay tower speakers slightly under cover, and shut down the PA for ten minutes while lightning passed. When the storm eased, power technicians inspected connections, the FOH engineer verified signal flow, and the show resumed. The audience, drenched and delighted, sang louder than any line array could. The PA, thankfully, survived, though the amp racks went through a thorough drying ritual the next day.
The Business Perspective
Weather risk is a cost line. Include rain covers, drainage, dry storage, and extra labor in outdoor proposals. Negotiate weather clauses in contracts, covering delays, cancellation, and equipment damage. Event cancellation insurance with weather coverage is worth considering. Rental houses benefit from weatherproofing kits offered as add-ons, a profitable service when the sky turns gray.
Maintain maintenance logs, inspecting cabinets, drivers, and connectors after wet events. A post-rain inspection protects your inventory and your reputation.
A Rain Plan on One Page
Write a one-page rain plan and tape it to the FOH and monitor world desks. List cover locations, who deploys covers, who shuts down power, and who calls lightning holds. Add the weather service contact and the radar link. Assign roles by name, not by department. A crew that knows exactly who moves when the first drops fall can protect a PA worth hundreds of thousands in under five minutes.
Drying and Recovery Protocol
After a wet show, unpack amplifiers and open rack doors to dry in a warm, ventilated space. Check connectors for corrosion, and wipe contact surfaces with contact cleaner. Test every cabinet with a sweep tone and a polarity checker before the next show. Log any suspect driver and swap it immediately. A short recovery routine keeps small damage from becoming next week’s disaster.
The Takeaway
Rain turns a PA into a water feature only when preparation is absent. Cover it, elevate it, ground it, monitor the sky, and respect the lightning. Do those things, and the weather becomes a story rather than a catastrophe, and the only thing flowing through the speakers will be sound.
