Sleeping
Concerts
Motorcycle
Swimming
Work
Kids
On stage
In the studio
Rehearsals
Writing music
Mixing at home
Daily commute
Long journeys
Listening at home⏱️ Estimated reading time: 14 min
On this page: Overview
Key Takeaways
Most people choose an in-ear monitor by its drivers and then judge it with whatever IEM ear tips happen to be fitted. That is backwards. The tip is the only part of the IEM that touches your ear canal, and it decides the seal, the bass you hear and how long you can wear the pair before your ears tire.
Owners have a name for trying one tip after another: tip rolling. It is worth doing, because the right tip can change a pair more than you would expect, and a different size in each ear is completely normal. Our view at Bollsen is simple. Fit decides more than drivers.
We are a family-owned hearing company from Ljubljana and the official UK and EU partner of Unique Melody, so we see the same question in every inbox: why does my new IEM sound thin? If you are new to the category, what are in-ear monitors covers the basics. This guide is about the tip: silicone, foam or hybrid, bore width, sizing, two quick seal tests, what comes in each Unique Melody box and when to replace your tips.
Why does the ear tip matter more than people expect?
An ear tip couples the IEM’s nozzle to your ear canal and closes it into a small sealed space, and low frequencies only build up properly inside a sealed space. When the tip leaks, the bass escapes through the gap first, so a broken seal sounds thin long before it sounds quiet.
The drivers are only half of the system. The other half is the air between the nozzle and your eardrum, and the tip controls that air. It sets how tightly the canal is closed and how deep the nozzle sits, and its opening shapes what gets through. Our product pages put it plainly: try every size in the box before judging the sound, because the right tip sits snugly without pressure, “and that is when the bass fills in and the treble settles.”
If you want the mechanism behind this, how in-ear monitors work explains the drivers, the nozzle and the sealed canal in more depth. For choosing tips, one rule covers most cases: weak bass means check the seal before you blame the IEM.
Silicone, foam or hybrid: which ear tip material suits you?
Silicone ear tips are durable and easy to clean, foam ear tips expand to fill the canal and usually seal most easily, and hybrid TPE tips sit between the two; some, such as AZLA Xelastec, soften with body heat. Most IEMs ship with silicone, and that is where to start.
Silicone holds its shape, so it relies on the right size to seal. It is light on the ear, and many owners find it a touch brighter in the treble than foam. Memory foam is rolled thin, inserted, then left to expand for a few seconds; it forgives a canal that is not quite round and usually blocks more outside sound, but it soaks up wax and wears out first.
Hybrid tips made from thermoplastic elastomer (TPE) are the newest option. According to AZLA’s Xelastec ear tip documentation, the material reacts to body temperature and softens to the shape of the ear canal. Whether that feel suits you is personal, and only your own ears can settle it.
| Tip type | Seal | Comfort over hours | Effect on bass and treble | Durability | Cleaning |
|---|---|---|---|---|---|
| Silicone (single flange) | Good when the size is right; leaks if too small | Light and cool; can press if one size too large | Bass depends on the seal; treble often a little brighter | Longest-lasting of the three | Easy: wipe or rinse, dry fully |
| Memory foam | Usually the easiest full seal; blocks the most outside sound | Soft at first; can feel warm over a long session | Full bass; treble slightly softened | Shortest: loses its spring with use | Hard: absorbs wax and sweat, replace rather than wash |
| Hybrid TPE (e.g. AZLA Xelastec) | Good; Xelastec softens to the canal shape with body heat | Personal; try before you commit | Full bass with a silicone-like treble | Between silicone and foam | Wipe clean; avoid harsh solvents |
| Wide-bore silicone | As silicone | As silicone | More open treble; bass can sound leaner | As silicone | Easy, but wax reaches the nozzle sooner |
The table describes tendencies, not guarantees. The same tip can behave very differently from one ear to the next, which is the point of the sizing section below.
What does bore width do to the sound?
The bore is the opening through the middle of the tip, and its width changes the balance: a wide bore lets more high frequencies through and tends to sound airier, while a narrow bore softens the treble and makes the bass feel stronger by comparison.
That gives you a simple tuning tool. If an IEM sounds sharp or tiring in the treble, a narrower bore or a foam tip can take the edge off. If the bass feels boomy or bloated, a wider bore often clears it up. Bore width is fine tuning, though. It cannot rescue a tip that does not seal, so sort the size first.
How do you find the right ear tip size?
Size each ear separately, starting from the medium tip that is usually pre-fitted, because left and right ear canals often differ and the right tip for one ear may be the wrong one for the other. A tip that is too small breaks the seal and slips; one that is too large presses and never sits deep enough.
The evidence comes from hearing aids, which use the same physics. In a 2019 ISAAR study of instant ear tips, researchers measured five tip types in 60 ears and found large variation both between tip types and between people wearing the same type. In other words, “medium” is a label, not a promise.
Go down a size if the tip presses after ten minutes or will not go in far enough to seal. Go up a size if the IEM works loose when you talk or chew. If a pair still aches or keeps working its way out with every size, why IEMs hurt or fall out goes through the shell, nozzle and insertion causes.
How do you test the seal?
Two quick tests tell you whether the tip seals: a pressure check as you insert the IEM and a bass test with a track you know well. Run both in a quiet room and test each ear on its own.
- Insert the IEM properly. Reach over your head, pull the top of your outer ear gently up and back, and twist the IEM in until the tip sits snugly. With foam, roll the tip thin first and hold it in place for a few seconds while it expands.
- Pressure check. As the tip seals, room sound should drop away and you should feel a light, even pressure, not pain. When you ease the IEM out, a sealed tip gives a slight resistance or a soft release.
- Bass test. Play a familiar track with a steady bass line at a moderate volume. Press the IEM gently inwards with a fingertip: if the bass grows, the tip is leaking.
- Swap and compare. Try the next size up in the leaking ear, or a different material, and repeat until both ears sound the same with nothing pressed.
The insertion method matters as much as the tip, and how to wear in-ear monitors covers it step by step, including cable routing over the ear. On stage the seal has to survive singing, sweat and movement, which is why in-ear monitors for musicians puts so much weight on fit.
There is also a practical benefit. A good seal lets you listen at a lower volume, because you are not turning up to drown out the room. In the Federman and Ricketts listening-level study, musicians’ minimum acceptable level was about 6 dB lower on in-ear monitors than on floor monitors, though their preferred level was only about 0.6 dB lower. IEMs are not hearing protection; for gigs and festivals take Music SoundPRO earplugs.
Which ear tips come with Unique Melody IEMs?
Every Unique Melody IEM ships with ear tips, most in several sizes, and some models include two tip types so you can compare a silicone fit with a hybrid TPE fit out of the box. These are the tips listed under “In the box” on our Unique Melody in-ear monitors (UK) product pages, model by model.
- From The Start: UM Blue Core ear tips in S, M and L.
- MEST MKII: AZLA SednaEarfit Xelastec tips plus silicone tips, in several sizes. The product page’s advice is to try the AZLA tips first.
- MEST MKIII CF Blue: UM Open and UM Petal ear tips in S, M and L. Its 6 mm nozzle can feel wide in smaller ears, so trying every tip in the box matters here.
- Mason FS: AZLA SednaEarfit Xelastec and UM silicone ear tips.
- Stardust, MEST Jet Black and The Multiverse Mentor: UM silicone ear tips in several sizes, with transparent tips as well on the Jet Black.
- 2HT, 3DT, MEXT, Maven III Moonshard and MEST Fortune: ear tips in several sizes.
Contents are as supplied by Unique Melody and may vary slightly by batch. Whatever the model, work through every size and every tip type in the box before you buy anything else.
How often should you replace ear tips?
Replace ear tips when their condition changes, not on a fixed schedule: how often depends on the material, how many hours you wear them and how much they are exposed to sweat and earwax. Foam usually needs replacing first, silicone lasts longest and hybrid TPE sits in between.
Foam is due when it stays squashed, recovers instantly instead of slowly, or starts to crumble. Silicone and TPE are due when they tear, go sticky or slack, stay discoloured after cleaning, or start slipping in a canal they used to grip. A tip that has gone soft quietly breaks the seal, and the first sign is usually thinner bass.
Between replacements, wipe the tips after each session and keep wax out of the nozzle; how to clean IEMs covers tips, nozzles and filters without damaging the drivers. Never share tips. See your GP if your ear becomes painful, itchy, swollen or starts to discharge; the NHS guide to ear infections explains when to get help.
When are ear tips not enough?
Ear tips are not enough when no size or material gives you a seal that lasts a full session, or when your ear canals are an unusual shape. Then a custom-fit shell, built from a 3D ear scan or ear impressions of your ears, seals with the shell itself instead of a tip.
The IEM maker 64 Audio is honest about this in its comparison of custom and universal IEMs: seal is “less of a factor than you’d think” for small bass differences between the two, but “if you truly don’t get a good seal, then that’s a problem for sure.” In our range, Custom Fit is available on the MEXT, MEST MKII, MEST Jet Black, MEST Fortune, The Multiverse Mentor and Mason FS, always for £300 more than the universal version. Before you go custom, universal vs custom IEMs weighs up seal, comfort, lead time and returns.
Which IEM ear tips should you start with?
Start with the tips in the box. Size each ear separately, run the pressure check and the bass test, and only then try a different material: foam if you want an easier seal, hybrid TPE if silicone feels hard, a wider bore if the bass is too heavy.
Replace tips when they stop behaving like new, and count thin bass as a fit problem before you call it a sound problem. If you are still choosing the IEM itself, how to choose in-ear monitors in the UK walks through drivers, plugs, fit and budget. Get the tip right first. The rest of the IEM can only sound as good as the seal allows.
His connection to hearing protection stems from personal experience with sound sensitivity during live events and work in noisy environments, an issue that made him more aware of the long-term risks of unmanaged noise exposure. Today, as both a communicator and a user of BOLLSEN products, he is passionate about raising awareness around the importance of proactive hearing care.
At BOLLSEN, he develops data-driven marketing campaigns, writes SEO-focused articles, and manages communication channels that connect customers with practical knowledge about hearing protection. His work ensures that BOLLSEN’s message—prioritizing health, performance, and sustainability reaches a global audience in an engaging and trustworthy way.
Passionate about writing since childhood, Timotej combines creativity with a strong analytical approach, continuously testing new ideas in digital marketing, performance advertising, and social media. He believes in learning through innovation and collaboration, balancing leadership with openness to new perspectives.
Beyond his professional role, Timotej is committed to a healthy lifestyle and finds inspiration in fitness, sports, and quality time with friends. His personal passion for well-being aligns with BOLLSEN’s core values, making his work not only a career but also a cause he deeply believes in.
