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The in-ear monitor guide

IEM headphones: what they are and how to choose

An IEM (in-ear monitor) seals inside your ear canal. That seal is the whole trick: it blocks outside noise, keeps bass in, and lets you listen at lower volume. Choosing one comes down to three things: budget, what you will use it for, and how the tips fit your ears.

Open the IEM finder Picks by budget

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2-PIN SOCKETDYNAMIC DRIVERVENTBALANCED ARMATURESOUND TUBESNOZZLE + FILTEREAR TIPSECTION, NOT TO SCALE
Fig. 1 Inside a hybrid IEM: a dynamic driver for bass, a balanced armature for detail, sound tubes into the nozzle, and the tip that seals.
01 Budget

Pick your price

Good sound starts cheap. More money buys build, comfort, driver variety and refinement. Each guide lists picks with specs and the independent reviews behind them.

Under$50Your first good pairSingle dynamic drivers, detachable cables and research-target tunings.Chu II, Zero:2, Zero:Red, EW200See the picks Under$100Hybrids and better buildsBalanced armature hybrids, metal shells and swappable tuning nozzles.Hexa, Aria 2, EA500LM, IE 100 PROSee the picks Under$300Planars and refinementPlanar magnetic drivers, pro stage monitors and audiophile singles.S12 Pro, Timeless II, IE 200, SE215See the picks
02 Fit

The fit is the upgrade

Most "these IEMs sound thin" complaints are a seal problem. Three things decide it, before you spend another dollar.

  1. The right tip size

    Try every size in the box, and do not assume both ears take the same one. A tip that is too small leaks bass; one that is too big will not sit deep enough. Ear tip guide.

  2. A proper insert

    Pull the top of your ear up and back to straighten the canal, insert with a slight twist, then let go. Cable over the ear for over-ear designs. How to insert IEMs.

  3. A sensible volume

    A good seal blocks noise, so you need less volume. NIOSH recommends limiting exposure to 85 dBA averaged over 8 hours, with the safe time halving for every 3 dB louder.

03 Finder

Find your IEM in three taps

Budget, main use and the sound you like. You get a shortlist of three, why each fits, and a link to check the current price.

1 Budget
2 Main use
3 Sound you like

Your shortlist

04 Sound

How IEMs make sound

Two things shape what you hear: the drivers inside the shell, and the tuning the maker aims for.

DYNAMICCONE + VOICE COILBALANCED ARMATURETINY REED IN A BOXLOWSMIDS/HIGHSHYBRIDDYNAMIC + BA (OR MORE)PLANAR MAGNETICTHIN FILM BETWEEN MAGNETS
Fig. 2 Four driver types. Hybrids mix dynamic and balanced armature drivers.

Drivers. A dynamic driver is a tiny speaker cone, good at bass. A balanced armature is a small reed in a box, efficient in mids and treble. Hybrids combine both. Planar magnetic drivers move a thin film between magnets. Driver types explained.

Tuning. Harman researchers built an in-ear target from blind listening tests; in their studies listeners on average preferred IEMs whose response came closest to it (AES 2017, AES 2019). Many budget makers now tune toward it or a close variant.

Signal. Most IEMs run fine from a phone. No headphone jack? A USB-C adapter or dongle DAC does the job. Do you need a DAC?

20501002005001k2k5k10k20kFREQUENCY (Hz)LOUDERBASSMIDSTREBLEHARMAN-STYLEDIFFUSE FIELDILLUSTRATIVE, NOT A MEASUREMENT
Fig. 3 Two reference shapes. Illustrative, not measurements of any product.
05 Learn

Guides for getting it right

Fit, tips, cables, drivers and dongles, explained with drawings.

EARBUD: RESTS IN THE OUTER EARIEM: SEALS INSIDE THE CANALOPEN FITOUTSIDE NOISE GETS INBASS LEAKS OUTEASY ON, EASY OFFSEALED FITPASSIVE ISOLATIONFULL BASS AT LOWER VOLUMETIP SIZE MATTERSLearnIEMs vs earbudsDYNAMICCONE + VOICE COILBALANCED ARMATURETINY REED IN A BOXLOWSMIDS/HIGHSHYBRIDDYNAMIC + BA (OR MORE)PLANAR MAGNETICTHIN FILM BETWEEN MAGNETSLearnIEM driver types explainedNARROW BOREWIDE BOREFOAMDOUBLE FLANGEEAR TIPS IN SECTIONSMLTRY EVERY SIZE.LEFT AND RIGHT CAN DIFFER.LearnHow to choose IEM ear tips1 PULL UP + BACK2 INSERT + TWIST3 CABLE OVER EARRELEASE THE EAR, THEN CHECK THE SEAL WITH MUSIC PLAYINGLearnHow to insert IEMs0.78 MM 2-PINMMCXSOCKETTWO STRAIGHT PINS, PUSH FIT0.78 MM PINSSNAPS IN, ROTATESSNAP RINGONE COAXIAL SNAP FITLearn2-pin vs MMCX cablesPHONE / PCDONGLE DAC/AMPIEMsDIGITALANALOGNO HEADPHONE JACK? THE DONGLE IS THE DAC + AMP.LearnDo IEMs need a DAC or amp?
06 Models

Brands, models and uses

The names that come up in every budget thread, plus picks for musicians and gamers.

Models and brandsMoondrop IEMs20501002005001k2k5k10k20kFREQUENCY (Hz)LOUDERBASSMIDSTREBLENEUTRALV-SHAPEDWARMILLUSTRATIVE, NOT A MEASUREMENTModels and brandsTruthear IEMsModels and brandsKZ IEMs: ZS10 Pro and ZSN Pro XModels and brands7Hz Salnotes Zero:2Models and brandsShure SE215TRANSMITTERMONITOR MIX INBELTPACKIEMsFLOOR WEDGEWIRELESS IN-EAR MONITOR RIGBest IEMsIEMs for musicians and stageSTEPS, FRONT LEFTRELOAD, BEHINDDOORIMAGING: WHERE A SOUND SEEMS TO BESTEREO IEMs PLACE SOUNDS LEFT TO RIGHT; GAME AUDIO SETTINGS MATTER TOOBest IEMsIEMs for gaming
07 Shop

Shop by name

Straight to current listings. Read the matching guide first if you are not sure what fits.

08 FAQ

Questions people ask

What are IEM headphones?

IEM stands for in-ear monitor. IEMs are earphones that sit inside the ear canal and seal it with a soft tip. They started as stage monitors for musicians and are now popular for everyday listening because the seal blocks outside noise and delivers full bass at lower volume.

Are IEMs better than earbuds?

For sound and isolation, usually yes, because the seal keeps bass in and noise out. Earbuds that rest in the outer ear are easier to put on and let you hear your surroundings. IEMs take a minute to fit properly and need the right tip size.

How much should I spend on my first IEM?

Somewhere between $20 and $50 is enough to hear what a well tuned IEM does. Several sets in that range follow research-based tuning targets and use detachable cables. Spend more for build, comfort and refinement, not because cheap sets cannot sound good.

Do IEMs work with a phone?

Yes. Most IEMs are easy to drive. If your phone has no headphone jack, a USB-C to 3.5 mm adapter or a small dongle DAC handles the conversion. A few sets plug straight into USB-C.

Are IEMs safe for your ears?

Used at sensible volume, yes, and a good seal helps because you do not need to turn up the volume to beat background noise. NIOSH recommends limiting exposure to 85 dBA averaged over 8 hours, and halving the time for every 3 dB louder.

Sources: What Hi-Fi?, American Musical Supply, AES 2017, NIOSH. We have not tested these products; see how we choose.