Setting Up Microphones and Talkback for a Clean Live Broadcast

Start with the room, not the desk

Before anyone touches a fader, spend ten minutes listening to the studio with the lights on and the cameras in position. Clap once and listen to how long the sound lingers. Walk the set and note where fan noise, air handling or monitor hum is loudest. These observations decide where microphones can sit and which ones will cope. A hard-walled studio with a glass backdrop will reflect more than a draped one, and no mixing trick fully removes a reflection that was captured at the source.

I come at this as a camera operator who spends every live show a few feet from the presenters, so I hear the problems before they reach the gallery. The most common cause of poor sound is a set built for how it looks and only later handed to the sound team. If you are planning a studio or reworking one, bring audio into the conversation when the desk, screens and furniture are first positioned.

• Clap once and note how long the echo lasts
• Switch on every fan, monitor and light before listening
• Mark the noisiest spots on the floor plan

Placing microphones for presenters

For a seated news desk, small lavalier microphones clipped to the chest are the usual choice because they stay at a steady distance whatever the presenter does with their head. Clip them about a hand's width below the chin, centred on the breastbone, and keep the cable clear of jewellery and collars. Rustle is the enemy: tuck the cable in a loose loop under clothing so it cannot drag, and ask the presenter to wear something that does not swish.

For a standing presenter or a guest sofa, consider a boom or a fixed desk microphone as a backup to the lavalier. A second source costs little and saves a bulletin when a battery pack fails. Whichever you choose, keep each microphone the same distance from its speaker across the whole programme, and check it with the presenter reading real copy rather than counting numbers.

• Lavalier a hand's width below the chin, centred
• Loop and secure the cable so it cannot rub
• Fit a backup source for key presenters

Laying out the mixing desk

A tidy desk is a fast desk. Group channels by role: presenters together, guests next, then playback and outside sources on the right. Label every strip with tape or the desk's own scribble display, using the names the crew actually say aloud, not internal codes. When a producer shouts for the weather guest's microphone, the operator should find it without reading anything twice.

Set a sensible starting level for every channel and save it as a scene before rehearsal. Leave generous headroom, because a laugh or a raised voice will always arrive louder than the sound check. Engage a gentle compressor on presenter channels rather than a heavy one, and keep the high-pass filter on to remove low rumble from desks and floors. Aim for a steady, comfortable level instead of chasing a number.

• Group channels by role and label them in plain words
• Save a starting scene before rehearsal
• Leave headroom above the sound-check level

Talkback routing that crews can rely on

Talkback is the thread that holds a live show together, and it fails quietly when nobody has agreed who hears what. Decide the routes on paper first: the director to all crew, the director to the presenter's earpiece, the floor manager to the director, and a private line for the producer. Keep presenter earpieces on a separate feed so that gallery chatter never leaks into their ear while they are on air.

Test every route with the person who will use it, wearing the equipment they will wear on the day. A talkback system that works at the desk can still be too quiet on the studio floor, where cameras and set movement add noise. Give the floor crew a clear way to reply, and mark which button is the cough or mute control so a presenter can silence themselves without hunting.

• Write the routes down before wiring them
• Keep presenter earpieces on a separate feed
• Test each line with the person who will use it

Rehearse with the whole crew

A sound check with only the sound team in the room tells you very little. Run a full rehearsal with cameras moving, graphics rolling and playback clips firing, because that is when interference, cable pulls and level jumps appear. Ask the presenter to read at their usual pace and at a slightly louder one, and listen to what happens to the guest microphones when the room gets busier.

During rehearsal, keep a short written list of anything that sounded off, however small. A faint buzz on one channel is far easier to trace before the show than during a live segment. Walk the camera paths with the sound supervisor so that boom shadows, radio dropouts and trailing leads are found while there is still time to move them, and agree who is allowed to change a setting once the show is running.

• Rehearse with cameras, graphics and playback running
• Keep a written fault list during the run
• Agree who may change settings once live

A short routine for the day of the show

On the day, arrive early enough to power everything up in a fixed order and listen for new noise before the crew fills the room. Fit fresh batteries in every radio pack, record the frequencies used, and keep spares within reach of the desk. Run a last check on each microphone with its wearer, then check the earpieces and every talkback route in turn.

Keep a calm, quiet tone in the gallery once the programme is on air. A clear sound chain gives the operator room to react, but only if the setup is already settled. Resist the urge to adjust something that sounds acceptable. Note any problem for the debrief, fix it afterwards, and let the show run.