Lavalier microphones, headsets and failover for weddings and interviews.

At a live event, voice equipment is often the smallest and most fragile part of the chain: a capsule the size of a grain of rice, a cable passing beneath clothing, and a radio link crossing a room full of phones. When that chain fails, there is no editing: the audience hears rubbing, crackling or silence.

This guide covers the two families of body-worn microphones, lavalier and headset, their placement to avoid clothing noise, the failover concept supporting wireless-link reliability, and specific equipment choices for wedding microphones and interview microphones.

Lavalier and headset: two approaches to pickup

A lavalier, clipped to a lapel or tie, attaches to clothing and works at a distance from the mouth. It is discreet, quick to fit and lets the speaker stand, walk or pick up a briefcase. In return, mouth distance changes with each turn, fabric rubs, and an omnidirectional lavalier also picks up room ambience.

A headset mounts the capsule on a headband or hoop, with a rigid boom ending at the mouth’s corner. Constant distance keeps level and timbre stable through movement and considerably improves gain before feedback, because the channel needs less gain. Visibility is its cost, although stage and theatre work consider it an advantage: placement is repeatable night after night.

Choose by the script rather than the catalogue:

• If the user moves and must remain visually unobtrusive → an omni lavalier with a good clip.
• If there is room noise, an active PA or singing → a headset with an omni or short cardioid.
• If the speaker stays behind a lectern → a condenser tabletop microphone often wins, rather than either option.

Placement, fastening and clothing noise

Most lavalier problems are mechanical rather than electrical. Three rules resolve 90 % of cases.

1. Cable route: a loop or long loop with slack, clipped to the seam without tension, and without crossing the transmitter antenna.
2. Fabric contact: the capsule must not rest on beads, ties or linings. Place a felt disc or the clip’s own rubber between lapel and capsule, and test speaking and head turns before considering it fitted.
3. Reference distance: for omni lavaliers, 12 to 20 cm below the chin. Closer improves the relationship to room noise, but increases rubbing and plosives.

For a headset, place the capsule one or two centimetres from the mouth’s corner, never in front: breath enters there, producing plosives and saturation. Manufacturers also recommend checking headband fit while the performer sweats, because elasticity relaxes and the capsule shifts centimetres during the second half-hour.

For wind, outdoor movement or a moving camera, add a foam or fur windshield and a second cable fastening at the neck.

Failover: frequency and equipment redundancy

Failover prevents a gap in the spectrum becoming silence. It has three layers, best used together:

• Coordinated backup frequencies: coordination software calculates extra channels compatible with the active ones and prepares them. If interference affects a channel, the operator switches it to a reserve through the spectrum manager within seconds. Without a coordinated reserve, switching requires recalculation in front of the audience.
• Frequency diversity: the transmitter sends identical audio through two independent carriers; the receiver evaluates both and keeps the better one, so a degraded carrier does not interrupt the stream.
• Device and route redundancy: a backup receiver or link replicates the primary configuration for hot replacement on failure, alongside network redundancy covered in the guide to audio-over-IP networks.

None replaces prior coordination: failover works because backup frequencies are already clean before the event, as explained in the guide to frequency coordination.

Wedding microphones

Weddings combine three challenges: the ceremony, usually acoustic with little amplification; the banquet, with room noise, wind outdoors and many people talking; and table speeches by improvised speakers with no technique. A workable equipment allocation is:

• Ceremony: omni lavaliers on the officiant and couple, plus a condenser tabletop mic for readings. Fresh batteries and an already coordinated backup channel.
• Speeches: lavalier or handheld dynamic according to the speaker. What matters is a checked RF channel and gain adjusted with the person who will speak rather than someone else.
• Backup coverage: an extra receiver listening to a clean frequency, a spare mic of the same model, and tested XLR adapters.

Coordinate in the actual space, with its brick walls and hall windows, rather than the classroom where equipment was prepared. Speakers change at the last minute, so use a 30-second routine per person: fit the mic, secure the cable, speak at console level and note the channel.

Interview microphones

For interviews and press conferences, the criteria change: speech clarity and channel independence lead. Three usual formats:

• Two lavaliers, one per participant, for a fixed camera with room in the frame. This requires cable and clip discipline.
• One tabletop mic per person when nobody must move; a short cardioid in the table centre prevents contamination between speakers.
• One headset per person for moving interviews or noisy outdoor locations.

Add wireless management: mute the silent person’s channel, turn off an idle transmitter, and watch the RF meter throughout recording. Coordinated failover is no luxury here: an interview question cannot be repeated because interference arrived.

Kit, tests and maintenance

Before leaving home, the minimum list is batteries or a charged pack plus spares, a complete backup mic, clips and felt discs, windshield, tape and scissors, adapters, XLR to jack and jack to XLR, and a test cable. Soundcheck includes speaking at level with the actual person, walking through the service areas, turning their head and raising the PA to event level. Without testing against audience noise, it has not been tested.

After the event, clean the windshield, inspect the clip, store the cable with its loop and recharge batteries. Maintenance turns a reliable kit into one that remains reliable at the month’s fourth event.

Next step

With voice equipment settled, review its supporting cables and power: connectors, levels and electrical safety in Single-phase/three-phase power, balanced signals and TS/TRS connectors.