What Is Body Surface Line Routing for Audio Gear? (Lav Mic Clips)
Body-surface line routing is the planned path of a lavalier microphone cable along a wearer’s clothing, from the mic capsule to a bodypack or recorder. A good route stays comfortable, avoids snagging, and limits cable noise. It uses a compatible clip or mount, controlled slack, and a movement test—not hidden or unapproved wiring.
Does your lav mic sound clean when you stand still, then rustle or tug as soon as you move? The route may be the problem, even if the microphone itself is working well. Plan the cable path with the garment, connector, and wearer’s movement in mind.
Use a lavalier only with the wearer’s knowledge and consent. Follow the microphone and transmitter makers’ instructions. No IRC, IBC, or NEC provision specifies how to route a body-worn lavalier cable. IEC 60268-4 covers microphone characteristics and measurement, not where to place a mic on a person.
What Is Body-Surface Line Routing?
Body-surface line routing means laying a lavalier cable along clothing in a planned path between the mic and its recorder or transmitter. The goal is to keep the line stable without pulling the capsule, rubbing against fabric, irritating skin, or blocking access to the pack.
Unlike a cable run inside a wall, this route moves with the wearer. It is a practical fitting task, not a building-code detail. A path that looks neat while someone stands still can become taut when they bend, sit, or lift an arm.
The route usually follows a garment edge or seam where practical. The microphone capsule stays near the desired pickup point, while the cable runs toward a stable pocket, belt, or purpose-made pouch. Small, secured service loops at the mic and pack ends help prevent movement from pulling directly on clips or connectors.
A service loop is a short reserve of cable that allows ordinary movement. It should not hang loose or form a loop that can catch on a hand, chair, bag, or other object. There is no one correct loop size; cable type, clothing, and activity all matter.
The principle is simple: let the garment support the cable, and keep movement force away from the microphone and connector. Check the route on the actual wearer in the actual clothing.
Plan the Mic, Garment, and Cable Path
Planning means checking the wearer, clothing, microphone, pack, and cable before attaching anything. This brief survey helps you choose a route that works with the equipment instructions and the garment, rather than forcing a standard path onto every setup.
Start by confirming consent and asking what movements the wearer needs to make. Note the garment fabric, layers, seams, and likely pinch points. Check the mic model, connector type, cable length, and transmitter or recorder instructions for any routing limits.
As a starting point, place the capsule about 150–200 mm (6–8 in.) below the mouth. This is a production guideline, not a required tolerance. Listen and adjust for the speaker’s voice, plosives, and clothing noise. A position that works on a still fitting may need adjustment after the wearer moves.
Choose a route that avoids crossing the neck, running taut across a joint, or passing through a pinch point. Do not sharply fold or kink the cable. If the cable maker gives a minimum bend radius, follow it. There is no universal minimum bend radius for all lavalier cables.
| Setup choice | Useful starting point | Check before use |
|---|---|---|
| Capsule position | About 150–200 mm (6–8 in.) below the mouth | Listen for rub, plosives, and suitable level |
| Cable route | Along a garment seam where practical | Check that fabric does not press on or scrape the mic |
| Cable slack | Small, secured loops near mic and pack | Ensure they allow movement without snagging |
| Pack location | Stable pocket, belt, or suitable pouch | Keep controls accessible and antenna clear as specified |
Secure the pack so it does not swing or pull on its cable. Keep the controls and battery accessible, and follow the maker’s guidance for antenna placement. There is no universal clearance or airflow measurement that applies to every pack.
Check Movement, Contact, and Pack Access
A movement check tests whether the route remains safe and quiet beyond a static fitting. Have the wearer move through the actions expected during use, then inspect the capsule, cable, clips, and pack. Fix tension or contact at its source instead of hiding it with a loose, unsecured loop.
Ask the wearer to turn, sit, stand, walk, and raise their arms. Include any work or performance motions that are part of the task. Watch for a cable that pulls across a joint, a connector that shifts, a clip that slips, or fabric that rubs the capsule.
Pay attention to comfort as well as sound. A route may be acoustically quiet but still press on skin, pinch under a layer, or restrict movement. Ask the wearer whether anything pulls or irritates. Do not tighten a wrap to make a cable stay in place.
I treat the first standing fit as a draft, not a final check. In a common setup, a cable routed neatly down a shirt can become taut when the wearer reaches forward. The fix is to revise the path and add restrained slack where it is needed, then repeat the movement check. It is not to leave a hanging loop near the hand.
| Movement or contact test | Look for | Adjustment |
|---|---|---|
| Turn head and torso | Cable shifts or pulls at the capsule | Reposition the route or clip |
| Sit and stand | Cable catches, compresses, or tightens | Change the path around the bend or seat area |
| Raise both arms | Tension across shoulder or chest | Allow a controlled path that follows the garment |
| Walk and reach | Loose loops or pack swing | Secure the line and stabilize the pack |
| Speak and move | Rustle, rubbing, or level changes | Adjust mic position and fabric contact, then retest |
A clean static fit does not prove a route is safe for motion. Recheck after each adjustment, because changing one attachment can shift tension elsewhere.
Route and Secure the Cable
Routing means placing the cable along the chosen garment path and fixing it with equipment suited to that microphone and fabric. The aim is to limit movement without crushing the cable, damaging clothing, or transferring a tug to the capsule or connector.
- Place the capsule. Use the compatible clip or mount and begin near the 150–200 mm (6–8 in.) guideline. Adjust by listening, not by distance alone.
- Choose the garment path. Follow a seam where practical and avoid the neck, joints, and pinch points. Keep the cable from crossing a path where hands or equipment may catch it.
- Add restrained slack. Leave a small, secured service loop near the clip and another before the pack or connector. Each loop should support normal movement without hanging free.
- Secure the cable. Use the mic’s compatible clip or mount. If tape is needed, use a product approved for the fabric or skin contact involved. Check its instructions for dwell time and removal.
- Place the pack. Secure it in a stable pocket, belt, or purpose-made pouch. Keep controls and battery access, and follow the manufacturer’s antenna guidance.
Tape, clip geometry, and removal methods vary by product and material. Do not assume that a tape safe for one garment is suitable for another, or that skin-safe adhesive is suitable for every wearer. Avoid improvised adhesives and tight wraps; they can harm skin, damage fabric, or strain the cable.
| Attachment method | Best fit | Main caution |
|---|---|---|
| Manufacturer-compatible clip | Garments that hold the clip securely | Check grip and capsule orientation during movement |
| Purpose-made mount | Mic models with a matching mount | Follow the maker’s mounting instructions |
| Approved garment tape | Where a clip does not suit the fabric or placement | Confirm fabric and skin-contact suitability and removal method |
Verify Audio, Comfort, and Strain Relief
Verification means listening to the microphone while checking the wearer and cable through normal movement. It confirms that the route is quiet, comfortable, and secure before use. A visual check alone cannot reveal every fabric rub or intermittent connector problem.
Monitor with headphones while the wearer speaks at a normal level and moves through the same actions used in the fit check. Listen for rustle, scraping, thumps, changes in level, and dropouts. If noise appears, pause and identify whether it comes from capsule contact, cable movement, clothing, or the pack.
Strain relief means arranging the cable so ordinary movement does not pull directly on the mic capsule or connector. Inspect both ends after movement. Confirm the clip is holding, the cable is not pinched, and the connector remains seated as the equipment maker requires.
A practical check sequence is:
- Confirm the wearer is comfortable and understands the route.
- Check the capsule, clips, cable path, pack, and connector by sight and touch.
- Monitor speech while the wearer turns, sits, raises their arms, and walks.
- Correct rubbing, tension, or snag risk, then repeat the test.
- Confirm audio and wireless operation, and keep pack controls accessible.
- Remove clips or tape using the equipment and adhesive instructions.
If the route still produces noise, do not assume a different cable path will solve every issue. The capsule may be touching fabric, the garment may move against it, or the mic position may need adjustment. Make one change at a time and listen again.
Conclusion and FAQ
A reliable body-surface route combines a suitable mic position, a garment-aware cable path, controlled slack, secure attachments, and a movement test. The best route is not the one that looks most hidden; it is the one the wearer accepts and that remains comfortable, stable, and clear in use.
What does body-surface line routing mean for a lav mic?
It is the planned path of a lavalier cable along clothing from the mic capsule to a recorder or bodypack.
Where should I place a lavalier microphone?
About 150–200 mm (6–8 in.) below the mouth is a useful starting point. Listen and adjust for voice level, plosives, and clothing noise.
How much slack should I leave in the cable?
Leave small, secured service loops near the mic and pack. The right amount depends on the cable, garment, and movement; avoid loose loops that can snag.
Can a lav cable bend sharply at the clip?
No. Avoid kinks and sharp folds. Follow the cable maker’s minimum bend radius if one is specified; there is no universal value for all lav cables.
Should the cable follow a clothing seam?
A seam is often a useful route because it can help support the cable. Check that the seam does not press on the capsule or create friction.
Where should I put the bodypack?
Use a stable pocket, belt, or purpose-made pouch. Keep the controls and battery accessible, and follow the manufacturer’s instructions for the antenna.
How do I test for cable noise?
Monitor with headphones while the wearer speaks, turns, sits, raises their arms, and walks. Listen for rustle, rubbing, thumps, level changes, and dropouts.
Can I use tape to secure a lav cable?
Use only tape approved for the fabric or skin contact involved. Follow its instructions for placement, dwell time, and removal.
Is body-worn lav routing covered by building codes?
No IRC, IBC, or NEC provision specifies body-worn lavalier routing. Follow the audio equipment instructions and applicable recording laws.
Can I route a microphone without telling the wearer?
No. Use a body-worn microphone only with the wearer’s knowledge and consent.
(This article was written by one of our staff writers, Garrett Vance. Visit our Meet the Team page.)
