1DD + 2BA + 4EST
Seven drivers per side, each with its own part of the range.
New arrival
FIIOIN-EAR MONITORSCustomer reviews (0)
FiiO FX25 High Resolution In Ear Earphones
Seven drivers in carbon fibre.
Tribrid IEMs with a dynamic driver, two Knowles armatures and four Sonion electrostatics in light carbon-fibre shells.
Regular price
£749.99
Unit price
Including VAT
Free next day UK delivery
Awaiting stock arrival date — order now to reserve one from the next delivery. Nothing to pay until it arrives.
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FiiO FX25 High Resolution In Ear Earphones
A little extra. A better pairing.
Better together.
Hand-picked pairings for this product. Choose one — we'll add them together.
MEET THE FX25
Seven drivers in carbon fibre.
Tribrid IEMs with a dynamic driver, two Knowles armatures and four Sonion electrostatics in light carbon-fibre shells.
Electrostatic treble
The four Sonion drivers from FiiO’s flagship FX17, for open, airy treble.
Ready for any source
3.5mm, 4.4mm and USB-C plugs, and 22 pairs of eartips.
Read the full description
The FiiO FX25 are tribrid in-ear monitors with seven drivers per side: a 10mm lithium-magnesium dynamic driver for the bass, two custom Knowles balanced armatures for the mids and the handover to the treble, and four Sonion electrostatic drivers, the same as in FiiO’s flagship FX17, for open, airy treble. Carbon-fibre shells keep them light at about 7g each, and swappable 3.5mm, 4.4mm and USB-C plugs suit any source.
Seven drivers, each with a job
The dynamic driver’s lithium-magnesium diaphragm, at 1.6g/cm³, is lighter and stiffer than beryllium according to FiiO, with a flexible surround for low distortion and natural vocals and instruments. One Knowles armature is tuned for clear upper mids that blend smoothly with the electrostatics; the other has a vented back chamber for fuller lower mids, which suits pop vocals. The four Sonion EST65QB02 electrostatics give an airy, open treble. A new RLC second-order band-stop filter removes resonance peaks from the drivers and shell, for a smooth treble that stays easy to listen to.
Tuned shells
FiiO’s patented S.Turbo sound tube in the front chamber adds bass weight and punch and filters excess upper frequencies from the dynamic driver, and micro vents in the rear chamber balance the pressure for deeper bass and clear vocals. The shells are hand-laminated carbon fibre, light and rigid at 1.58g/cm³, so every pair has its own grain.
| Drivers | 1 × 10mm lithium-magnesium dynamic · 2 × Knowles BA · 4 × Sonion electrostatic |
|---|---|
| Frequency response | 10Hz–40kHz |
| Impedance and sensitivity | 20Ω · 106dB/mW @ 1kHz |
| Cable | 6N single-crystal copper, silver-plated, cryo-treated · about 1.2m · 0.78mm 2-pin |
| Plugs | Swappable 3.5mm, 4.4mm balanced and USB-C DAC |
| Weight | About 7g per earpiece, without the cable |
| Colour | Dusk Brown; the carbon-fibre pattern is different on every pair |
Cable and accessories
The cable is 6N single-crystal copper, silver-plated and cryogenically treated at −192°C for more than 100 hours, and its twist-lock plugs swap between 3.5mm, 4.4mm balanced and a USB-C DAC plug for phones. The standard 2-pin connector takes upgrade cables. FiiO includes 22 pairs of eartips, from SpinFit and FiiO HS18 to memory foam and double-flange, and an aluminium and leather NEST CUBE case.
Good to know
- At 20Ω and 106dB/mW they are easy to drive from a phone with the USB-C plug, and they scale up with a player or amplifier.
- In the box: FX25 earphones, cable with 3.5mm, 4.4mm and USB-C DAC plugs, NEST CUBE case, 22 pairs of eartips, magnetic cable clip, cleaning brush and quick start guide.
- Goes well with: the FiiO LINK TWS to make them wireless, or the FiiO CLASS A desktop amplifier.
In the box
- FiiO FX25 earphones
- Cable with swappable 3.5mm, 4.4mm balanced and USB-C DAC plugs
- NEST CUBE carrying case
- 22 pairs of eartips
- Magnetic cable clip and cleaning brush
- Quick start guide
THE FINER DETAILS
Built for
better listening.
Know what you’re choosing.
Find the right fit for your setup.
- Design
- Tribrid in-ear monitors · hand-laminated carbon-fibre shells in Dusk Brown (every pattern unique)
- Drivers
- 1 × 10mm lithium-magnesium dynamic · 2 × custom Knowles BA (mid and high) · 4 × Sonion EST65QB02 electrostatic
- Impedance
- 20Ω @ 1kHz
- Sensitivity
- 106dB/mW @ 1kHz
- Frequency response
- 10Hz–40kHz
- Hi-res support
- Hi-Res Audio certified
- Weight
- 7g
- Cable length
- 1200mm
- Cable connector
- 0.78mm 2-pin · over-ear cable, 6N single-crystal copper, silver-plated, cryo-treated
- Plugs supplied
- Swappable twist-lock plugs: 3.5mm, 4.4mm balanced and USB-C DAC
Specifications are based on manufacturer information and may change.
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How does free delivery work?
Every UK order has a free delivery option, and orders of £50 or more qualify for free next day delivery. Order by 12 noon, Monday to Friday, for next day delivery; orders placed after 12 noon, at the weekend or on a bank holiday are dispatched on the next working day. Stock availability and destination also affect arrival — check the options shown at checkout.
Pre-orders ship when stock arrives; the next day service starts after dispatch. Full delivery information
What if it’s not right for me?
Return within 14 days for any reason, or within 30 days if faulty, with free return postage. See our full Returns Policy for conditions and how to start a return.
Can you help me choose headphones?
Absolutely. Tell us what you listen to and the headphones you have — or the ones you’re considering — and we’ll help you find a suitable pairing. Chat with us
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Use the Price Beat option on this page to send us the competing offer. The team will review your request; it isn’t an automatic discount. How Price Beat works
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