What to do when the microphone fails at an event: who is responsible?

In short

• What to do when the microphone fails at an event starts with who holds the backup. A failure is any moment the room stops hearing the amplified voice: a dead battery, a radio dropout, a cable fault.
• The fix on the night is two jobs: the AV team swaps the kit, the host keeps the room hearing.
• Decide in the brief who holds the backup and who is responsible if it is missing. That is the whole question.
• Normally a spare is ready to put in the host’s hand. When it is not, the host still has to be heard.
• Hire a professional host when a failure would land on a room you cannot afford to lose.

What to do when the microphone fails at an event comes down to ownership before it comes down to kit. The microphone has dropped on me a few times over the years, and this is written for the organiser or venue manager who has to say who does what. The checklists are general advice; the parts about me are labelled.

What to do when the microphone fails at an event: who is responsible?

The host is responsible for the room hearing them, the AV team for the kit, and the organiser for making sure both know it. When nobody has been told, each assumes another has the spare. Say it in writing in the brief.

This is how I work. In my experience the microphone has dropped out on me a few times. Usually the AV support has a backup ready to put in my hand, and people carry on hearing me. One or two times that did not happen. My rule is that I am responsible for everyone being able to hear me.

My guide to briefing a host covers the wider handover.

Why microphones fail in the first place

Most radio microphone failures come from a short list: weak batteries, mismatched frequencies, local interference and a blocked line of sight between transmitter and receiver. Cables, power supplies and handling cause the rest. Knowing the cause tells you what to ask the AV lead.

Shure’s list of wireless failure causes (April 2015) names those four and says the receiver antennas need a clear line of sight to the transmitter at all times. A sponsored AV article on common AV fails (Skift Meetings, April 2018, written by an AV company) adds that a battery indicator can show full for hours and then drop fast, and that rings or a hand cupped round a handheld’s antenna can cause dropouts.

Ofcom’s licence guidance says licence-exempt and shared frequencies may suffer interference from other users, and that interference-free operation cannot be guaranteed. So a spare is not pessimism. It is the planned answer to a risk the regulator itself says remains.

Where should the backup microphone be?

The backup should be switched on, tested and held by a named person who can reach the host in seconds, not packed in a case at the back of the room. A wired lectern microphone is a useful second layer because it has no battery or radio to fail.

The Skift article says to keep backup microphones on standby at all times and to use wired lectern microphones as an emergency backup. Its questions for an AV team are worth borrowing: is the spare on standby throughout, is there a battery swap schedule, and has the venue coordinated frequencies with other events in the building?

The point I would add is about hands. A spare in a flight case helps nobody. One in the AV lead’s hand, ready to walk to the stage, is what I mean when I say it is normally ready to put in my hand. For which type to choose, see my guide to handheld vs lapel.

What to do when the microphone fails at an event and no spare arrives?

When no spare arrives, the host’s job does not change: everyone must still hear. Move closer to the room, project, and use whatever the venue offers, from a lectern microphone to a riser. The room should never be left guessing what was said.

That is the one or two times for me. I do not have a step-by-step to offer, only the principle. If it takes standing on chairs, or raising my voice so much I might lose it, so be it. I would rather lose my voice and stand on chairs than have people not hear and the event go badly.

General advice for the organiser: you can shrink the distance a voice has to travel. Ask the venue to stop background music and close the bar service for a few minutes, bring guests at the back forward, and clear the nearest tables of clattering plates. Each of these costs little and gives an unamplified voice a fighting chance. None of it replaces a spare, but it is what you can do in the minute before the spare walks on.

Two cautions from me as a general view, not a rule. A chair is a last resort, and an organiser who can offer a stable step or riser makes it unnecessary. And a voice is not unlimited. The NHS laryngitis advice says shouting and whispering both strain the voice, that it usually clears in 1 to 2 weeks, and to speak as little as possible while it does. That is the reason the spare matters: my voice is the last line of defence, not the plan.

Why everyone in the room needs to hear

Because some of your guests rely on hearing the speaker clearly. RNID’s prevalence page, updated 21 October 2026, says over 18 million people in the UK are deaf, have hearing loss or tinnitus, one in three.

In a full room, a fair share of your guests may be straining already. When the amplified voice drops, they lose it first. Shure’s presenter guide advises doing a sound check and not forgetting the back row, so test from there before doors.

Keeping the room while the spare arrives

A host keeps the room by staying calm, saying plainly what is happening and giving people something to do while the AV team works. Do not fiddle with the equipment on stage. The room is the host’s, the kit is the AV lead’s.

Toastmasters’ advice on preparing technology (December 2020) says to have a plan B, arrive early, and if something goes awry, keep your cool and move on. The Irish Times (October 2018) reports a speaker’s tip to throw a question at the audience while you regroup.

General practice: say one sentence about the fault, ask the room to lean in, and take a question from the nearest table while the spare is fetched. My notes on dead air cover longer gaps, and there is a conference version of this on conferencehost.uk.

When is it worth hiring a professional host for this?

It is worth hiring a professional host when the room is large, the guests are paying or important, and a failure would be visible to everyone. A seasoned host agrees the signal and the spare with the AV lead beforehand and takes responsibility for being heard.

I normally arrive about three hours before, which gives time to walk the room and speak to the AV lead before anyone is seated. Nicola Briscoe of the Electrical Industries Charity wrote on my reviews page: “He’s really professional, engaged the room and took control where we needed it.”

DIY is fine for a small internal gathering: one microphone, a charged spare, a colleague who knows where it is. For a corporate event with speakers or an awards evening, the sound plan belongs in the brief.

Have your date, venue, room size, running order and who speaks ready, plus what went wrong last time. Call me on 07596 851647 or email hello@eventhost.info, and tell me who your AV lead is. I will be glad to help as your event host.