In-ear monitors protect a musician's hearing only if the mix is kept down: they reduce stage noise, but in a Vanderbilt study musicians chose listening levels only about 0.6 dB lower than with floor wedges.
The stakes are real. In a Norwegian survey of 111 rock musicians, 37.8% had hearing loss and 20% had chronic tinnitus, and a 2018 systematic review covering 4,618 professional musicians found hearing loss in 38.6% of them. Tinnitus in musicians covers that broader occupational risk. In-ear monitors (IEMs) deserve their own article because they are widely perceived as a hearing-protection solution, and that perception is only partly accurate.
What IEMs are and why musicians use them
In-ear monitors are custom-fitted earpieces that let a performer hear a personalised mix of their own performance — vocals, specific instruments, a click track — replacing the large floor wedge speakers traditionally used on stage. They offer real advantages beyond hearing: more consistent sound from venue to venue, more mobility on stage, and less vocal fatigue from not having to compete with loud stage monitors.
The protective potential
The custom fit is what lets an IEM reduce ambient stage noise, and how much it reduces depends on fit quality and the shape of the ear canal. Combined with the fact that IEMs remove the need for loud floor wedges pointed at the performer, this gives them real potential to reduce a musician's overall noise exposure compared with traditional stage monitoring.
The important nuance: they're not automatically protective
IEMs are not safety devices in themselves. The protection depends on the musician keeping the personal mix at a safe level, and the research suggests that does not happen by default.
A Vanderbilt University study measured the listening levels musicians preferred for their own voice through floor wedges and through in-ear monitors, while the levels of stage music and crowd noise were varied. Preferred levels with in-ear monitors were only about 0.6 dB lower than with wedges — a difference small enough, the authors noted, that the same recommended exposure time would apply to both. The isolation did not, on its own, translate into a quieter mix.
The same study points to the fix. The minimum level musicians found acceptable was significantly lower with in-ear monitors, a much larger difference, and the authors concluded that IEMs may reduce musicians' noise exposure, but that proper counselling would likely be needed before that advantage was realised.
Why this happens, and what determines the outcome
The isolation an IEM provides paradoxically removes some of the natural cues, like hearing the room and the other instruments acoustically, that might otherwise prompt a musician to turn down. Without deliberately choosing a lower target, that isolation can be filled right back up by raising the in-ear mix, so the protective outcome depends far more on the musician's own volume habits than on the technology.
What makes IEM use protective in practice
- Deliberately using the lowest mix level that is functionally workable, rather than defaulting to a familiar loud level, is the single most important factor. The gap between preferred and minimum acceptable levels in the Vanderbilt study is the room this uses: the equipment enables safety but does not create it.
- A sound level meter app lets you check how loud the stage and room around you are rather than judging by ear. Several are free; the OHSU hearing conservation service recommends the NIOSH Sound Level Meter app.
- Avoiding "porting", a modification some musicians use to let ambient sound leak into IEMs for a more natural feel. Letting stage noise back in gives up the isolation and invites a louder mix to compensate.
- Custom-fit earpieces, not generic universal-fit tips, since fit quality directly determines how much isolation you get.
- A baseline hearing test if you perform regularly and have never had one, so that any later change can be measured; a first audiology appointment covers what that involves.
The pattern this fits into
None of this is unique to IEMs. The Norwegian survey of 111 rock musicians found that custom-fitted earplugs do have a preventive effect, and that only a minority of musicians use them consistently. The same shape shows up here: the equipment works, and the constraint is whether it gets used the way it needs to be used. An IEM turned up to a familiar loud level and an earplug left in a bag are the same problem wearing different hardware.