iem headphones Mest MKII from the inside

iem headphones Mest MKII All the accesories

Unique Melody MEST MKII In-Ear Monitor (IEM)

4.0 (1 reviews)

A wide, holographic stage and deep sub-bass that make your music feel bigger than your headphones.

Wide, three-dimensional soundstage: instruments sit around you, not between your ears
Deep, full sub-bass with smooth, detailed treble
8 drivers per side: dynamic, balanced armature, electrostatic and bone conduction
One-piece carbon-fibre shell with gold-foil finish
Universal Fit or Custom Fit built to your ears

EDM, pop, rock and film scores
Listeners who want scale and sub-bass
Long listening sessions at moderate volume

Official Unique Melody partner for the UK & EU
Pre-order: Universal Fit delivered by DHL Express within 5 working days
Custom Fit: hand-built and delivered in about 3 weeks once we have your ear impressions
2-year BOLLSEN warranty with UK & EU support
14-day returns on Universal Fit with the hygiene seal unbroken
Price includes UK VAT

Fit Type

Plug

Clear

A Leader in High-End In-Ear Monitors

What owners say about the MEST MKII

Reviews from verified owners of the Unique Melody MEST MKII.

At first I wasn’t immediately impressed with the MEST MKII.

However, after a few days of listening, the sound quality truly revealed itself. The audio became incredibly rich, clear, and detailed, with excellent isolation thanks to the full in-ear fit.

Once my ears adapted, the listening experience was remarkable — far more immersive than traditional over-ear headphones. While there are some small improvements that could be made to the design and accessories, the sound performance itself is outstanding.

Jonh H.

Amazing sounding in-ear monitor.

Ryan Dolan

Flagship Sound, Crafted by Unique Melody

The MEST MKII represents the next generation of flagship in-ear monitors from Unique Melody. Designed for audiophiles, musicians, and critical listeners, it combines advanced acoustic technology with refined craftsmanship to deliver an exceptional listening experience.

Each earphone is carefully engineered to reproduce music with remarkable clarity, depth, and balance. From powerful low frequencies to detailed highs, the MEST MKII reveals the full character of every recording, allowing listeners to experience music exactly as it was intended.

Finished with a distinctive carbon fiber and gold-foil design, the MEST MKII blends premium materials with high-performance engineering, creating an in-ear monitor that looks as impressive as it sounds.

MEST MKII at a glance

The crowd-favourite MEST: big, cinematic sound from four driver technologies in one carbon-fibre shell.

Key specs

Drivers per side: 1 dynamic, 4 balanced armature, 2 electrostatic, 1 dual-sided bone conduction
Impedance: 12.3 Ω · Sensitivity: 112 dB @ 1 kHz
Frequency response: 20 Hz – 70 kHz
Connector: flat 0.78 mm 2-pin
Cable: UM Copper M2 OCC copper, 3.5 mm, 4.4 mm or 2.5 mm
Shell: one-piece carbon fibre with gold foil

In the box

MEST MKII monitors (pair)
UM Copper M2 cable
Leather carry case
AZLA SednaEarfit Xelastec and silicone ear tips in several sizes
Cleaning tool, storage pouch and warranty card

Contents as supplied by Unique Melody and may vary slightly by batch.

Buy with confidence

Official Unique Melody partner for the UK & EU
Pre-order: Universal Fit delivered by DHL Express within 5 working days
Custom Fit: hand-built and delivered in about 3 weeks once we have your ear impressions
2-year BOLLSEN warranty with UK & EU support
14-day returns on Universal Fit with the hygiene seal unbroken
Price includes UK VAT

Plug: choose 3.5 mm, 4.4 mm balanced or 2.5 mm balanced above.

The Technology Behind the Legendary MEST Sound

The MEST MKII is built around a sophisticated multi-driver architecture designed to deliver exceptional performance across the entire frequency range. Inside each earphone, several specialized drivers work together through a carefully tuned crossover system.

A 10 mm dynamic driver produces deep and controlled bass, while balanced armature drivers reproduce the midrange with clarity and precision. Dual electrostatic drivers extend the high frequencies, revealing subtle details and natural air in the music.

Unique Melody’s dual-sided bone conduction driver adds another dimension to the sound by transmitting micro-vibrations through the shell, enhancing texture and realism. This innovative combination allows the MEST MKII to deliver a highly detailed, spacious, and immersive listening experience.

Feel the Music with Bone Conduction Technology

The MEST MKII features Unique Melody’s innovative bone conduction technology, designed to enhance the way sound is perceived. Instead of relying only on air movement like traditional earphones, this system transmits subtle vibrations through the shell directly to the inner ear.

By bending ultra-thin ceramic layers in response to the audio signal, the bone conduction driver adds another dimension to the listening experience. This allows the MEST MKII to deliver greater depth, richer textures, and a more immersive soundstage.

The result is music that feels more natural and lifelike, revealing details and layers that conventional in-ear monitors often miss.

Premium Materials, Precision Components

Carbon Fiber Shell

The MEST MKII features a one-piece carbon fiber shell with elegant gold foil accents, combining durability with a refined aesthetic. Beyond its distinctive appearance, the ergonomic shell design ensures a comfortable and secure fit while improving contact with the ear. This precise fit also enhances the effectiveness of the bone conduction system, allowing the earphones to deliver a more immersive and detailed listening experience.

High-Purity Copper Cable

The MEST MKII is paired with a premium OCC copper cable developed in collaboration with PW Audio. Designed for clean and stable signal transmission, the cable helps preserve the full detail and dynamics of the sound. Its durable construction and flexible design ensure long-term reliability while providing a comfortable listening experience for everyday use.

Why Unique Melody?

Unique Melody hand-builds in-ear monitors and custom monitors for listeners and musicians around the world, and keeps trying ideas other brands do not.

Bone-conduction pioneers

The original MEST brought a bone-conduction driver into an in-ear monitor. Today UM combines up to four driver technologies in one shell.

Materials with a purpose

Carbon fibre, zirconia ceramic, 3D-printed titanium, stabilised wood and walnut: each chosen for how it sounds as much as how it looks.

Custom specialists

UM has built custom monitors from ear impressions for years. Selected models are available as Custom Fit, moulded to your ears.

Official UK & EU partner

BOLLSEN is Unique Melody’s partner for the UK and EU: genuine stock, a 2-year warranty and support from our own team.

What reviewers say about the MEST MKII

One of the best-loved MEST models: owners rate it 4.7 out of 5 on Head-Fi, and reviewers keep coming back to its huge, holographic stage. The honest caveats: it needs a deep fit and the right tips, and the treble can get hot if you push the volume.

What they love

A holographic stage and precise imaging (IEMRanking reviewer consensus)
Smoother, more natural timbre than the original MEST (headphones.com)
Deep sub-bass and plenty of micro-detail
A smaller, more comfortable shell than the first MEST

Worth knowing before you buy

Treble can become fatiguing at high volume
Sound depends on fit: try the AZLA tips first
Some reviewers see it as a sidegrade to the original MEST rather than an upgrade

Summarised from independent reviews: headphones.com, IEMRanking, Headfonia, Mobileaudiophile.

Who is the MEST MKII for?

For listeners who want their music to feel big: wide, deep and full of air, with a sub-bass you feel as much as hear.

Made for

EDM, pop, rock, cinematic and orchestral music
Listeners who love a big, holographic stage
Anyone happy to try a few ear tips to find the perfect seal

The sound in short

V-shaped and full: deep sub-bass, smooth mids, extended treble
Very wide, three-dimensional stage
Natural, coherent timbre

Maybe not for you if

You are sensitive to treble and like to listen loud
You have very small ears (it needs a deep fit)
You want lush, forward vocals above all else

Handcrafted Audiophile Earphones

Unique Melody in-ear monitors are designed for listeners who demand exceptional sound quality. Each model is carefully engineered to deliver precise tuning, deep detail, and a truly immersive listening experience.

Advanced Multi-Driver Technology

Unique Melody IEMs combine multiple driver technologies — including dynamic, balanced armature, electrostatic, and bone conduction systems. This hybrid design allows them to reproduce music with remarkable clarity, natural timbre, and impressive soundstage.

Built for Years of Listening

Premium materials, precision assembly, and detachable high-quality cables ensure long-term reliability. Designed for audiophiles, musicians, and everyday listening, Unique Melody earphones deliver flagship-level performance wherever you go.

Custom Fit: Moulded to Your Ears

Made for your ears only

The Custom Fit MEST MKII is hand-built from impressions of your own ears. A full-shell seal gives steadier bass, better isolation from background noise and all-day comfort, and reviewers say it is where Unique Melody’s sound comes fully alive.

How it works

Choose Custom Fit and place your order.
We email you our ear-impression guide.
A local audiologist takes your impressions (usually charged separately by the audiologist).
Send them in using our instructions. Your monitors are hand-built and delivered by DHL Express in about 3 weeks.
Not quite right? We arrange a free refit.

Custom monitors are made to order for you, so the 14-day change-of-mind return does not apply. Your 2-year warranty and statutory rights do.

MEST MKII: your questions answered

Universal or Custom Fit: which should I choose?

Universal Fit arrives fast and uses ear tips, so you can share it or resell it. Custom Fit is moulded to your ears: a perfect seal, more stable bass and the strongest bone-conduction effect. Reviewers consistently say the MEST sound comes alive in custom shells.

Does the bone-conduction driver make a difference?

It adds a subtle, tactile layer and a sense of depth rather than a separate sound. You notice it most with a deep, well-sealed fit, and most of all in the Custom Fit version. We would rather you know that before buying than be surprised.

MEST MKII, MKIII or Jet Black?

MKII is the fullest and most cinematic, with the most sub-bass. MKIII CF is the most balanced and vocal-friendly, with relaxed treble. Jet Black is the most technical, with the best staging and imaging in the MEST family. Not sure? Ask us and we will help you choose.

Do I need an amplifier?

No, a good phone dongle or music player will drive it. A balanced 4.4 mm source gives it more control and reviewers found it opens up the stage.

Which ear tips should I use?

With a universal IEM the ear tip decides the seal, and the seal decides the bass and the treble. Try every size and type in the box before judging the sound: the right tip sits snugly without pressure and the bass suddenly fills in. Reviewers say this matters on almost every Unique Melody model.

Which plug should I choose?

Choose it above, before you add it to your basket. 3.5 mm works with most dongles, laptops and music players. 4.4 mm balanced suits dedicated music players and balanced DACs and gives more control. 2.5 mm balanced is for older players that use that socket.

How does ordering a Custom Fit work?

Choose Custom Fit and place your order. We email you our ear-impression guide. A local audiologist takes the impressions (usually charged separately by the audiologist), you send them in using our instructions, and your monitors are hand-built and delivered by DHL Express in about 3 weeks. If the fit is not right, we arrange a free refit.

How fast is delivery?

Unique Melody monitors are sold on pre-order. Universal Fit is delivered by DHL Express within 5 working days. Custom Fit takes about 3 weeks once we have your ear impressions.

What warranty and returns do I get?

Every Unique Melody product from BOLLSEN comes with a 2-year warranty, handled by our UK & EU support team. Universal Fit monitors can be returned within 14 days if the hygiene seal is unbroken. Custom Fit monitors are made to order for your ears, so the change-of-mind return does not apply, but you get a free refit and the full warranty. Your statutory rights are not affected.

Why buy from BOLLSEN?

BOLLSEN is the official Unique Melody partner for the UK and EU. You get genuine stock, a 2-year warranty handled by our own support team, clear delivery times, and help choosing the right model or fit before you buy.

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Fit Type	Custom Fit, Universal Fit
Plug	3.5 mm, 4.4 mm balanced, 2.5 mm balanced

Manufacturer Information

BOLLSEN - ERTG d.o.o.
Dunajska cesta 159
1000 Ljubljana
Slovenia
support(@)bollsen-hearingprotection.com

Product Identification

Product Image:
Product Category: IEM
Model: Unique Melody MEST MKII In-Ear Monitor (IEM)
Article Number: IEM-UM-001-U-44, IEM-UM-001-U-25, IEM-UM-001-C-44, IEM-UM-001-C-25, IEM-UM-001-C-35, IEM-UM-001-U-35

Free UK delivery over £35 and a 40-day money-back guarantee on our earplugs.

UK orders over £35 ship free in 2 to 3 business days; below £35, tracked delivery costs £4.95 and takes 1 to 3 business days. If you are not completely satisfied, simply contact us within 40 days of purchase for a full refund. No questions asked. You pay the return postage, and we recommend sending it tracked. For more details, including delivery to Europe and the rest of the world, please visit our Shipping & Delivery Terms page. Our warehouses are located:

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Customer reviews

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Toddlers on the road

Hello, our child tolerated the toddler ear muffs on his little head quite well during the transfers by speedboat and seaplane. They sit nicely on the head, I was just disappointed that they don't hold well on the forehead and kept sliding down over his eyes (even more with a sweaty forehead), even though there's a sort of rubberised strip there. But it looks like they eliminated the noise as they should, because the child wasn't scared of the noise and even fell asleep. So I recommend them, it's just that either a better way of fastening them on the head needs to be worked out, or a different system from the manufacturer.

Translated · Show original

Batola na cestach Dobry den, chranice sluchu pre batola nase dieta celkom strpelo na hlavicke pocas presunu rychloclnom aj hydroplanom. Pekne sedia na hlavicke, len som bola sklamana ze to moc nedrzi na cele a sa mu to zosuvalo na ocka (pri spotenom cele este viac), hoci je tam taky pogumovany pasik. Ale vyzera, ze hluk to eliminovalo ako malo, lebo sa dieta nebalo hluku a dokonca zaspinkalo. Cize odporucam, len je potrebne bud potrenovat lepsie uchytenie na hlavicke alebo iny system od vyrobcu.

Erika K. · ✔ Verified purchase · 2026-08-26 ·

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