Sleeping
Concerts
Motorcycle
Swimming
Work
Kids
On stage
In the studio
Rehearsals
Writing music
Mixing at home
Daily commute
Long journeys
Listening at home
- Official UM partnerUK & EU, genuine stock
- 2-year warrantyHandled by our own team
- 14-day returnsUniversal Fit, seal unbroken
- Hand-builtBy UM's master artisans
The MEST Jet Black feeling
Every musician, exactly in place.
Pin-point imaging and a stage with real depth: hear exactly where every musician stands.
Find your Unique Melody in 3 taps
Is the MEST Jet Black the one for you?
Three questions, honest answer. If another model suits you better, we will say so.
1What do you play most?
2How do you feel about treble?
3What is your budget?
Your match
3 questions to go
Answer the questions and we will match you to the right model.
Watch before you buy
Don't take our word for it.
Independent reviewers on the MEST Jet Black. Hear what they hear, then decide.
Independent reviews. Plays right here, and only loads when you press play.
No time for 20 minutes?
Skip straight to what you care about
Each one plays the review from that exact moment.
The sound
Precise, layered and deep.
The most technical MEST yet: 10 drivers, a hybrid bone-conduction system and a zirconia ceramic shell.
BOLLSEN sound map, summarised from independent reviews.
Maybe not for you if you are sensitive to treble or want a warm, laid-back sound: try the MEXT.
Inside Unique Melody
Hand-built by people who have done it for a decade.
Every pair is assembled, soldered and tuned by hand in Unique Melody's own five-storey workshop, then listened to and measured before it ships.
Photos and facts © Unique Melody.
Inside the shell
The most technical MEST.
10 drivers per side and a hybrid bone-conduction system in a zirconia ceramic shell.
- 011 × dynamic: fast, deep bassTight and well controlled.
- 024 × balanced armature + 2 × electrostaticResolution and air across the range.
- 033 × bone conduction (2 composite + 1 piezo)A hybrid system for depth and texture.
- 04Zirconia ceramic shellDense, inert and beautifully finished.
As seen on YouTube
10 honest reviews. Watch, listen, decide.
Life with MEST Jet Black
Wherever the music takes you.
Choose your fit
Ready to wear, or moulded to your ears.
Custom Fit is moulded to your ears for a perfect seal and all-day comfort. Universal is the fast, flexible way in.
| Universal Fit | Custom Fit | |
|---|---|---|
| How it fits | Ear tips in several sizes | Hand-built from impressions of your ears |
| Bass and isolation | Great with the right tip | Steadier bass, more isolation |
| Bone-conduction effect | Subtle | Strongest |
| Delivery | DHL Express, 5–7 working days | 3–4 weeks after we get your 3D scans |
| Returns | 14 days, hygiene seal unbroken | Made to order: free refit instead |
How Custom Fit is made · UM has built custom monitors since 2006
Find where to get your ears measured
Custom Fit monitors are made from ear impressions or a 3D scan of your ears. We accept both. Audiologists and hearing centres across the UK and Europe can take them in a short appointment.
- 1Order Custom Fit
- 2Book impressions or a 3D scan
- 3Send them to us
- 4Yours in 3–4 weeks
When you call, ask for “ear impressions for custom in-ear monitors”.
Most clinics charge a small fee. Our ear-impression guide arrives by email after you order.
When you call, ask “Do you offer 3D ear scanning for custom in-ear monitors?”
Not every clinic has a scanner, so ask first. Our guide email after you order explains how to send us the scan file.
Reviews
What owners and reviewers say
Headfonics score
The critics' choice of the MEST line: Headfonics scored it 9/10 and called it a big step up from the MKII, and Audiophile Heaven added it to its Hall of Fame. The trade-offs are a forward treble some ears find intense, a fit that rewards trying the transparent tips, and some driver flex on insertion.
What they love
- The best staging and imaging in the MEST range (Headfonics)
- Resolution and separation built for technical performance (Everyday Listening)
- A premium, durable ceramic build and leather case (Audiophile Heaven)
- Easy to drive and consistent at any volume
Worth knowing
- Treble is forward: lovely on good recordings, intense on harsh ones
- Fit matters: reviewers got the best seal with the transparent tips
- Some driver flex when inserting, which is common with this design
- Ceramic is heavier than resin or carbon fibre
Summarised from Headfonics, Everyday Listening, Audiophile Heaven, The Headphone List.
Awesome set. Excellently balanced. Lighter on bass, but good depth, amazing layering and separation. Can't go wrong here.
MRG · Verified owner
A good and truly unique IEM. It has a more mature tuning than its predecessors. It won't give you an immediate wow, but with good music it becomes wonderful when paired with a solid player.
Robert · Verified owner
Own the MEST Jet Black? Add a photo and tell other listeners what you hear.
The details
Everything you need, nothing to add.
In the box
- MEST Jet Black monitors (pair)
- UM Jet Link custom cable (OCC copper, 26 AWG), included in the plug you choose
- Italian leather carry case
- UM silicone tips and transparent tips, S/M/L
- Cleaning cloth, mesh bag and warranty card
Contents as supplied by Unique Melody and may vary slightly by batch.
Key specs
- Drivers per side: 1 dynamic, 4 balanced armature, 2 electrostatic, 3 bone conduction (2 composite + 1 piezo)
- Crossover: 4-way air + 2-way bone conduction
- Impedance: 12.6 Ω · Sensitivity: 106 dB @ 1 kHz
- Frequency response: 20 Hz – 70 kHz
- Connector: 0.78 mm 2-pin
- Shell: zirconia ceramic (“Black Jade”) with aluminium faceplate
Which plug?
- 3.5 mm: phone dongles, laptops and most music players
- 4.4 mm balanced: dedicated players and balanced DACs, more control
- 2.5 mm balanced: older players with that socket
- The cable is included in every plug, at the same price
- No amplifier needed for most listeners
Delivery
- Universal Fit: DHL Express, 5–7 working days
- Custom Fit: 3–4 weeks once we have your 3D ear scans
- Price includes UK VAT
Warranty & returns
- 2-year BOLLSEN warranty with UK & EU support
- Universal Fit: 14-day returns with the hygiene seal unbroken
- Custom Fit: made to order, free refit if the fit is not right
- Your statutory rights are not affected
Product safety
The MEST family
MKII, MKIII or Jet Black?
 MEST MKII |  MEST MKIII CF Blue | You are here MEST Jet Black | |
|---|---|---|---|
| Character | Fullest, most cinematic | Most balanced, vocal-friendly | Most technical |
| Bass | |||
| Vocals | |||
| Staging | |||
| View MEST MKII | View MEST MKIII CF Blue | Selected |
Character summarised from independent reviews.
FAQ
Your questions, answered
Universal or Custom Fit: which should I choose?
Universal Fit arrives fast and uses ear tips. Custom Fit is moulded to your ears, which removes the fit fuss reviewers mention and gives the bone-conduction system the firmest contact.
Is the cable important?
Owners say the Jet Black is cable-sensitive. It comes with UM’s matched Jet Link OCC copper cable, and we recommend starting there before experimenting with upgrades.
MEST Jet Black or MKIII CF?
Jet Black is more technical and neutral, with less bass and the best imaging. MKIII CF is more relaxed and vocal-friendly. Choose Jet Black for detail, MKIII CF for easy, natural listening.
Is driver flex a fault?
No. A small crackle when pushing the monitor in is common with multi-driver designs and does not harm the drivers. Insert gently and it settles.
How does ordering a Custom Fit work?
Choose Custom Fit and order. We email our ear-impression guide, a local audiologist takes the impressions (usually charged separately), you send them in, and your monitors arrive by DHL Express 3–4 weeks after we receive them. Not right? We arrange a free refit.
How fast is delivery?
Universal Fit is delivered by DHL Express in 5–7 working days. Custom Fit takes 3–4 weeks once we have your 3D ear scans.
What warranty and returns do I get?
A 2-year BOLLSEN warranty handled by our UK & EU team. Universal Fit can be returned within 14 days with the hygiene seal unbroken. Custom Fit is made for your ears, so instead of a change-of-mind return you get a free refit. Your statutory rights are not affected.
Why buy from BOLLSEN?
BOLLSEN is the official Unique Melody partner for the UK and EU: genuine stock, a 2-year warranty from our own team, clear delivery times and help choosing.
Bought from a hearing company. Looked after for 2 years.
The official Unique Melody partner for the UK & EU: genuine stock, help choosing and warranty support from our own team.
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