How to Place Wireless Lavalier Microphones?

Proper wireless lavalier microphone placement is essential for capturing crisp, broadcast-quality dialogue while preventing unwanted friction noise and visual distractions. Achieving clean audio requires positioning the capsule 6 to 8 inches below the talent’s chin along the sternum, securing both the capsule and the cable to eliminate clothing rustle, and safely mounting the transmitter bodypack. Whether miking talent openly for broadcast or concealing the capsule for narrative video, following structured placement techniques ensures consistent sound levels and dependable wireless transmission.

The Optimal Placement Zone

The primary target for mounting a lavalier microphone is the center of the talent's chest, roughly along the sternum. Positioning the capsule between 6 and 8 inches (15 to 20 cm) below the mouth maintains a natural tonal balance without picking up excessive vocal plosives or chest resonance. Placing the microphone too close to the throat results in a muddy, boomy sound, while placing it too low on the torso introduces room echo and requires higher gain levels, raising the noise floor.

Because most lavalier capsules use an omnidirectional polar pattern, pointing the head directly toward the mouth is not strictly necessary. In fact, pointing the microphone head slightly downward or sideways can reduce direct breath hits and plosive bursts without diminishing voice clarity.

Common Mounting Methods

Exposed Mounting for Interviews and Corporate Video

For news, corporate videos, and documentary interviews where visible gear is acceptable, use the standard vampire clip or alligator clip.

• Button-Down Shirts: Clamp the alligator clip to the front placket, roughly between the third and fourth buttons from the top.
• T-Shirts and Crewnecks: Attach the clip directly to the collar center or slightly to one side, ensuring the capsule does not tilt inward toward the skin.
• Ties and Lapels: Secure the clip to the inside edge of a jacket lapel or behind the tie, positioning the capsule so it remains unobstructed.

Concealed Mounting for Narrative and Commercials

When the microphone must remain completely hidden from the camera, specialized mounting tools provide acoustic isolation:

• Moleskin and Gaffer Tape: Sandwiching the capsule between two layers of moleskin or creating a tape "triangle" prevents direct contact between the microphone body and clothing fibers.
• Silicone Concealers and Rubber Mounts: Purpose-built rubber mounts isolate the capsule physically, creating a small acoustic buffer cavity beneath clothing layers.
• Under-Collar Placement: Tucking a micro-lavalier under the stiff fabric of a dress shirt collar conceals the hardware while preserving line-of-sight acoustics to the speaker's mouth.

Eliminating Clothing Noise and Rustle

Fabric rubbing against the microphone capsule or cable is the most common cause of ruined dialogue tracks. Synthetic fabrics like silk, polyester, and nylon create severe static and rustle; natural fibers like cotton, wool, and denim produce significantly less friction noise.

To eliminate movement noise, secure the microphone capsule to a single layer of clothing rather than sandwiching it between two moving layers. If clothing shifts frequently, use medical tape or wig tape to secure the inner layer directly to the subject’s skin, anchoring the fabric in place. For exterior shoots with wind, always equip the capsule with a miniature foam windscreen or a synthetic fur windjammer (deadcat).

Cable Strain Relief: The Broadcast Loop

Vibrations traveling up the microphone cable can introduce low-frequency thumps directly to the audio capsule. To prevent this, always create a strain relief loop (frequently called the broadcast loop or newsman's loop). Form a small loop in the cable just below the mounting clip and secure it back inside the clip's jaws or with a small piece of tape. This loop absorbs mechanical movement from the subject's body, preventing tugging forces from reaching the capsule.

Run the remainder of the cable down the inside of the talent’s shirt, taping the cable flat against the fabric or the skin at the lower waist to prevent loose whipping as the talent moves.

Transmitter Bodypack Placement

The transmitter bodypack should be placed securely to protect the unit and ensure uninterrupted radio frequency (RF) performance:

• Belt or Waistband: Fasten the bodypack on the subject's back waistline or hip, clipping it securely to a belt or thick waistband with the antenna pointing straight up.
• Ankle or Thigh Straps: For dresses, skirts, or athletic wear lacking a sturdy waistband, secure the bodypack using an elastic neoprene leg or waist strap.
• Antenna Isolation: Keep the flexible antenna from directly touching bare skin, as direct contact with sweat or skin moisture detunes the antenna and drastically cuts wireless transmission range.