In-ear monitors for singers have to do three things well: seal out the stage, carry the voice clearly without forcing the level up, and stay put while the jaw moves. Get the seal and the fit right first, then choose a voicing that sets your voice forward in the mix, and keep that mix as low as the song allows.
This guide is for vocalists moving off floor wedges, and for singers who already wear in-ear monitors but find their own voice sounds closed in. It explains the occlusion effect, what the research says about safe levels, and how custom and universal in-ear monitors for singers differ in practice. We fit performers at our studio in Singapore and build for singers overseas, and these are the questions they bring.
Key takeaways
- The occlusion effect is the boomy, closed-in sound of your own voice when the ear canal is sealed; low frequencies can rise by up to 30 dB.
- A deeper fit reaches the bony part of the ear canal, which in hearing-aid practice solves most occlusion complaints.
- In a 2008 study, musicians accepted levels about 6 dB lower on in-ear monitors than on floor wedges, but chose levels only 0.6 dB lower when left to themselves.
- The WHO counts 80 dB as safe for up to 40 hours a week, and only 4 hours a week at 90 dB.
- AAW A3H+ LUX has a Vocal voicing for speech, worship and vocal monitoring; Z06 puts vocals forward over a deep sub-bass.
What do in-ear monitors for singers need to do?
An in-ear monitor is an earphone that seals the ear canal and plays a personal monitor mix. For a guitarist it is a convenience. For a singer it is closer to an instrument, because pitch depends on hearing yourself clearly against the band.
The seal comes first. A monitor that blocks the stage lets the mix stay quiet and still be heard. One that leaks invites the engineer, or you, to push the vocal up until it cuts through, and the level climbs through the set. Isolation is the quiet foundation everything else stands on.
Next is the voicing. Singers want the voice placed slightly forward, with clear upper mids and no glare at the top, so the vocal can sit at a modest level and still read. Last is fit. A singer's jaw opens and closes all evening, and a monitor that shifts with it breaks the seal mid-phrase.
Why does your own voice sound boomy in IEMs?
When the ear canal is sealed, the sound of your own voice changes. Part of it reaches the canal through the bones of the head, and with the canal blocked that energy has nowhere to go. The result is the occlusion effect: a voice that sounds boomy, hollow or "in a barrel".
The effect is concentrated in the low frequencies. Writing on hearing-aid moulds, Mark Flynn notes that low-frequency sound can rise by up to 30 dB in a canal sealed by an unvented earmould, and that the amount varies greatly between people (The Hearing Review). For a singer, who listens to their own voice for the whole set, it is hard to ignore.
Depth of fit
Audiologists treat occlusion in two main ways. The first is depth. The cartilaginous outer part of the canal vibrates with the voice; a fit deep enough to reach the bony part beyond it damps that. Donald Hayes advises a fit that makes contact with the bony portion, which he says should solve most occlusion problems (AudiologyOnline). Impressions for in-ear monitors are usually taken to the second bend of the canal, partly for this reason (AudiologyOnline).
Vents and a little room
The second remedy is venting, which lets some low-frequency pressure escape. In hearing aids it trades against feedback; in a monitor it trades against isolation. The other practical fix lives in the mix. A pair of ambient microphones brings back some of the room, so your voice has air around it again.
How loud should a singer's mix be?
As low as the song allows, and the research suggests musicians seldom get there unaided. In a study at Vanderbilt University, musicians found minimum acceptable levels about 6 dB lower on in-ear monitors than on floor wedges (Federman and Ricketts, 2008). Their preferred levels, though, were only about 0.6 dB lower. The authors suggest the benefit needs counselling before it shows up.
The limits make the case. The WHO counts 80 dB as safe for up to 40 hours a week, falling to 4 hours a week at 90 dB, and suggests keeping personal devices at no more than 60% of maximum (WHO). NIOSH recommends a workplace limit of 85 dBA averaged over 8 hours (NIOSH). A singer who rehearses, sound-checks and plays two sets in a weekend reaches those hours quickly.
A good seal is what lets you stay under them. The lower the stage spill reaching your eardrum, the less mix you need on top of it.
A fit that moves with the jaw
A singer's mouth rarely stays still for long. Jaw movement slightly alters the shape of the canal, which is why impressions for in-ear monitors are taken with the mouth held open (AudiologyOnline). Melissa Heche, writing for audiologists, goes further: she suggests the performer mirror their stage posture, and that a second set of impressions may help a vocalist who changes mouth shape a great deal (The Hearing Review).
For our custom builds we ask for impressions past the second bend, taking in the whole concha, with the mouth open on a bite block. Our ear impressions guide sets out what an audiologist needs, or what a 3D scan should capture. If you sing in an unusual posture, tell the audiologist before they begin.
Custom or universal in-ear monitors for singers?
A custom in-ear monitor is a monitor built in a shell cast from impressions of your own ears. A universal is the same kind of monitor in a standard shell, sealed with ear tips. Both can serve a singer well; they differ mostly in seal, depth and time.
| Universal IEMs | Custom IEMs | |
|---|---|---|
| Seal | Depends on the ear tip and how it is inserted | Shell follows your canal, the same every time |
| Depth of fit | Set by the tip and nozzle | Taken from impressions past the second bend |
| Sound | Tuning roughly 80–95% alike, depending on the ear canal | |
| Time to stage | Ships from stock | 6–8 weeks from impressions; about 3 weeks with Express |
| Sharing | Can move between singers with fresh tips | Fits one person only |
| If the fit is off | Change the tips | Free refit within 30 days of delivery |
For a singer who performs every week, we usually suggest a custom. A universal is a sound first pair, or a spare. We compare the two at more length in custom vs universal IEMs.
Which in-ear monitors for singers we suggest
These are the AAW models we point vocalists towards, described from their product pages. You can compare their curves on our frequency-response graphs.
A3H+ LUX, for the voice first
A3H+ LUX is a three-driver hybrid with a 10 mm graphene woofer and the NOVA open-vented armature, USD 259 as a universal. A switch gives four voicings. Vocal is meant for speech, worship and vocal monitoring; Vocal+ adds presence and articulation. The A3H+ LUX Custom is USD 349.
Z06, for singing over a band
Z06 pairs two 6 mm woofers with four balanced armatures, and puts vocals further forward over a deep sub-bass. At 110 dB and 12 Ω it plays loud enough from a phone dongle, a player or a desktop amplifier. Its Bass-Flow vent lets pressure out of the ear canal, so long sessions stay comfortable. It is USD 329 as a universal; the Z06 Custom, USD 419, can carry your band logo.
ATH, for a switchable stage voice
ATH has two 8 mm graphene woofers, three mid-range armatures for the voice and a NOVA armature for the treble, from USD 449. Four settings on two switches include one called Live, and each also changes the impedance and sound pressure level.
A1D, a first pair
A1D is a single 8 mm dynamic driver, USD 149, which AAW recommends for vocals, guitar, keyboard and bass.
Where to start
Start with the seal. In Singapore, book a visit and we take impressions at the studio in 10–20 minutes for SGD 50. Custom monitors take 6–8 weeks from when your impressions arrive, or about 3 weeks with our Express service for USD 150. Each custom pair comes with a 1.2 m detachable Null Audio cable, a cleaning brush and cloth. Our page on IEMs for musicians sets out the line-up by role, and singers in a church band will find more in in-ear monitors for worship teams. For a whole band, see group orders.
Frequently asked questions
Why does my voice sound strange with in-ear monitors?
Sealing the ear canal traps the part of your voice that travels through the bones of the head, so it sounds boomy or hollow. This is the occlusion effect, and it is strongest in the low frequencies. A deeper fit, a little room from ambient microphones in the mix, or venting usually helps.
Are custom in-ear monitors better for singers?
For a singer who performs every week, usually yes. A custom shell is cast from impressions of your ears, so it seals the same way every time and sits deeper than most ear tips. A universal is a good first pair or spare, and the tuning of the two is roughly 80–95% alike, depending on the ear canal.
How loud should a vocalist's in-ear mix be?
As low as the song allows. The WHO counts 80 dB as safe for up to 40 hours a week, but only 4 hours a week at 90 dB. In a 2008 study, musicians accepted levels about 6 dB lower on in-ear monitors than on wedges, but chose levels only 0.6 dB lower unless guided.
What are ambient microphones in an in-ear mix?
Ambient microphones are microphones that pick up the room or the audience and feed it into the monitor mix. With the ears sealed, they bring back a sense of space around your voice, at a level you choose. They give the voice some air without adding vocal level.
Which AAW in-ear monitor suits a singer?
We usually suggest A3H+ LUX, whose Vocal voicing is meant for speech, worship and vocal monitoring, at USD 259 as a universal or USD 349 as a custom. Z06 puts vocals forward over a deep sub-bass, and ATH has four settings including one called Live.
How long do custom in-ear monitors take?
Custom IEMs take 6–8 weeks from the day we receive your ear impressions or scan, plus shipping. Our Express service builds them in about 3 weeks for USD 150. In Singapore, impressions at our studio take 10–20 minutes and cost SGD 50.
Sources
- Federman J, Ricketts T. Preferred and minimum acceptable listening levels for musicians while using floor and in-ear monitors. J Speech Lang Hear Res, 2008
- WHO: Deafness and hearing loss: safe listening
- NIOSH: About noise and hearing loss prevention
- The Hearing Review: Opening ears, the scientific basis for an open ear acoustic system (Flynn, 2003)
- AudiologyOnline: Occlusion effect (Hayes, 2004)
- AudiologyOnline: Ear impressions for in-ear monitors (Gordon, 2009)
- The Hearing Review: The art of accurate earmold impressions for in-ear monitors (Heche, 2024)
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