Common Sound Engineering Mistakes at Live Events and How to Avoid Them

The most common mistake I see is planning the room first and the broadcast feed second. A front of house mix is built for the people standing in the venue: it leans on the room, the speakers and the sound of a live crowd. A broadcast feed has to work for someone listening on a television or a phone, with none of that help. When both are taken from the same desk output, one of them suffers, and it is usually the viewer at home.

The fix starts at the planning stage. Decide early whether the broadcast feed is a separate mix, a matrix from the main desk or a stereo pair taken from a second console. Each choice has consequences for cabling, crew numbers and monitoring. A separate mix costs more in equipment and in an extra engineer, but it is the only option that lets the broadcast sound deliberately balanced rather than accidentally acceptable.

• Decide the feed type before the equipment list is fixed
• Name one person responsible for the broadcast mix
• Agree who signs off levels with the vision team

A line check is dull, and that is why it gets shortened when the schedule slips. Every input is tested from the stage end with the source actually playing, not simply confirmed as present on the desk. Without it, a faulty cable, a reversed phase or a dead battery turns up during the first song, in front of an audience and sometimes in front of cameras. At that point every fix is visible and every second of silence is on air.

Allow a fixed slot for it and protect it in the running order. For a festival with several acts, a stage plot and input list from each act, received in advance, shortens the process considerably. Mark each channel on the desk clearly, keep a spare for every critical microphone, and write down any change so that the next engineer inherits the real state of the stage rather than a guess.

• Test every input with the real source, not a tap on the capsule
• Collect stage plots and input lists before the day
• Keep labelled spares for vocal and lead instrument channels

Mixing a broadcast on the same large speakers used for the audience hides problems that viewers will hear. A mix that sounds full on a big system can be thin or muddy on a small television speaker, and dialogue can disappear under music. Engineers who never check on anything small are working half blind, however good the room is.

Use headphones and a pair of modest nearfield speakers alongside the main monitoring, and listen to the feed as the vision gallery hears it. Set a consistent monitoring level at the start of the day and keep to it, because a gradual rise in volume makes every mix feel better than it is. Mono compatibility deserves a check too, since many viewers still hear the result folded down.

• Check the mix on small speakers and in mono
• Fix one monitoring level and return to it
• Listen to the feed as it arrives in the gallery

Setting gain too hot early in the chain is a quiet mistake with loud results. Once a signal clips at the preamp or a converter, no later adjustment restores it, and a recording or broadcast carries the distortion permanently. Equally, gain set too low forces the noise floor up whenever the signal is raised downstream, which is audible on quiet passages and spoken segments.

Aim for healthy but safe levels at the first stage, and leave room for the loudest moment rather than the average one. Drummers, choirs and speakers who lean into the microphone all change during a show, so a level found in soundcheck needs a margin. Keep an eye on the meters of every stage that processes the feed, not only the desk, and agree what level the vision mixer and the transmission chain expect to receive.

• Leave headroom for the loudest moment, not the average
• Meter every stage that handles the feed
• Confirm the level the transmission chain expects

Audio often sits at the edge of the production conversation, so changes to the schedule, the set or the camera plan reach the sound team late. A new presenter position, a moved lectern or a camera that now blocks a boom path can quietly undo days of preparation. Radio microphone frequencies are a frequent casualty, because a second crew arriving on site can create interference nobody planned for.

The remedy is organisational rather than technical. Hold a short briefing with lighting, camera and workflow staff before rigging begins, and again before doors. Share one plan that shows microphone positions, cable routes and radio frequency allocations, and keep a named contact for audio questions on the day. A clear talkback channel between the sound position and the gallery solves more problems than any additional equipment.

• Brief all departments before rigging and before doors
• Share a single plan with mic positions and frequencies
• Keep a clear talkback line between sound and gallery

Many teams fix a problem on the day and then forget it, so the same fault returns at the next event. A hum traced to a particular power distribution, a radio microphone that dropped out in one corner of the stage or a monitor position that always fed back all belong in a written note while they are fresh. Memory is unreliable after a long load-out.

Keep a short log for each event: what was specified, what changed, what failed and what the fix was. Review it when planning the next job, and pass the relevant lines to the next crew. It takes ten minutes after the show and saves far more than that later. Over several events the log becomes the most useful document the audio team owns, because it records how the work was really done.

• Write down faults and fixes before leaving the venue
• Review the previous log when planning the next event
• Pass relevant notes to incoming crew