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FiiO FD5
Dynamic In-ear Monitors
Beryllium-coated DLC diaphragm | Front acoustic prism
Rear volcanic field system | Semi-open acoustic design
Interchangeable sound tubes | Interchangeable audio jacks
*Pictures are for reference only, actual product may vary.
A uniquely timeless
industrial design
2 specially selected
high-performance materials diaphragm
3 revolutionary
acoustic design breakthroughs
Newly developed DLC dynamic driver
Large 12mm dynamic unit
In the FD5 is a newly developed, large 12mm dynamic driver utilizing N52 magnets with a high magnetic flux of 1.5 Tesla - for extremely robust bass and excellent high frequency resolution.
1.5
Tesla magnetic flux
N52
magnets
12mm
diameter
Beryllium-coated surround + DLC diaphragm
We have conducted much research and experimentation when choosing the materials for our new dynamic driver. By combining the use of Beryllium and diamond-like carbon (DLC), we make full use of the physical rigidity and flexibility properties of the materials to reduce unneeded vibration and appropriately damp sound for improved quality. Overall, the frequency response is balanced and distortion is minimized at all frequency ranges.
Diaphragm Movement Comparison Graps
Common diaphragms
Beryllium-coated DLC diaphragms
Other diaphragms
FD5 diaphragm
Materials with weak rigidity are slower to respond to voice coil movements and produce irregular ripple-like movements, causing distortion
Because of its use of rigid DLC material, the diaphragm is more responsive to voice coil movements for less distortion and more accurate reproduction of sound.
High-end audio inspired acoustic prism
In order to address the issues that come with the time delay between different sound waves, an acoustic prism system was specifically developed for the FD5. This was inspired by similar technology used for adjusting tweeters in well-known high-end audio products.
By installing a conical device close to the front end of the driver diaphragm, we can precisely control how the sound waves travel in the sound tube – bringing benefits such as eliminating high frequency standing waves and enhancing overall sound wave diffusion.
Anti-standing wave and semi-open design
A “volcanic field”was added to the rear of the FD5 in order to reduce low-frequency standing waves, reduce distortion, and overall improve the diffusion of bass waves throughout the FD5. The FD5 also adopts a semi-open design, which relieves air pressure on the ear – leading to more comfortable and long listening sessions.
A sound you actually want
Compared with a multiple-driver IEM, in the FD5 there is only one point from which the sound is produced from a single driver – making for more accurate sound positioning. The dynamic driver was carefully tuned in acoustics to make the FD5 sound wonderfully pleasant to most people's preferences – a relaxed, natural
Curves of natural beauty
FiiO's third generation design is based on carefully-designed curves, evoking majestic mountains and wonderous waterfalls. These curves combined with a faceplate offering two distinctly different textures form a sort of “acoustic art”that needs to be experienced in person.
Casting a strong voice with stainless steel
The smooth, luxurious-feeling 3D embossed stainless steel faceplate represents both form and function – while looking striking, the robust stainless steel also reduces the harmonic distortion of sound inside the FD5. The faceplate provides a striking contrast against the chrome finish of the rest of the FD5 as well.
Art and science in harmony
The stunning curved cylindrical design of the FD5 is actually a benefit for acoustics, as such a design greatly reduces unwanted resonances and reflection of sound waves within the body – allowing every last detail of your music to be faithfully reproduced.
Large and small
Find something that suits you
Great sound comes from a great fit, which is why the FD5 comes with interchangeable sound tubes in small and large sizes to best fit your ear. The large sound tube is balanced, while the small sound tube presents a lively, more bass-focused sound.
*The small sound tube should be used with the triple-flange ear tips, for deeper insertion and better sound quality.
Interchangeable parts for unlimited possibilities
The included cable is an expanded MMCX design with 8 strands of monocrystalline silver-plated copper cable that perfectly and faithfully reproduces your music. The cable also features interchangeable audio plugs for 2.5mm/3.5mm/4.4mm, you to take advantage of a variety of sources.
Material: High-purity monocrystalline silver-plated copper
Wire diameter: Single wire 0.08mm, strand 24AWG, entire cable 18AWG
Wire count: 19 per strand, 8 strands, 152 total wires
Structure: Litz Type2, each wire is individually insulated
*Interchangeable audio jack is officially licensed from the patent by FABRILOUS
Hi-Res Audio certified
The FD5 is Hi-Res Audio certified, a testament to its highly-detailed, yet rich and lifelike sound.
Accessories worthy of the experience
Even the accessories have been thoughtfully considered for the FD5. The included HB5 storage case dutifully protects your earphones, while the included MMCX clips greatly facilitates detaching the MMCX cables.
*MMCX ASSIST is provided in cooperation with Final Inc.
Accessories Included
Earphone cablem，HB5 Storage case，Final MMCX ASSIST Interchangeable audio jack，Interchangeable sound tube Bass ear tips （S M L），Balanced ear tips （S M L） Vocals ear tips （S M L），Foam tips 4
Triple Flange tips （S、L），Manual，Cleaning brush
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Professional Reviews 86/100
Nicely Roasted
Sound Quality
85/100
Fit Comfort Isolation
83/100
Build Accessories
91/100
Value for Money
90/100
The FiiO FD5 delivers physical sub-bass, expansive 3D staging and a smooth single-driver flow that makes music feel vivid and effortless. Soundnews highlights its unusually airy scale and pinpoint placement, while its interchangeable nozzles, plugs and tips invite fine-tuning. A polished, feature-rich IEM for listeners drawn to energetic, spacious sound over strict neutrality.
What Reviewers Are Saying
Pros
Deep, clean and impactful bass reaches convincingly into the sub-bass without sacrificing definition.
Large, airy soundstage with strong layering and stable image placement stands out for an IEM.
Generous accessory package includes interchangeable sound tubes, extensive tip selection and 2.5mm, 3.5mm and 4.4mm plug options.
&
Cons
Bass-heavy tuning can bleed into the lower mids, leaving vocals and midrange instruments somewhat veiled for some listeners.
Treble can become sharp or slightly sibilant on demanding recordings, depending on nozzle and tip choice.
Optimal sound depends heavily on achieving a deep, secure fit and experimenting with the supplied tips and nozzles.
SOUND QUALITY PERFORMANCE 85/100
The FD5 is widely heard as an energetic, natural-sounding single-dynamic IEM with notably strong bass reach, spacious presentation and easy macro-dynamic flow. Its main trade-offs are a potentially bass-heavy lower range, somewhat recessed or veiled mids for some listeners, and treble that can become sharp depending on music, nozzle choice and fit.
Bass
86/100
Several reviewers praise deep, punchy and clean bass, with convincing sub-bass rumble, fast attack and strong physical slam. However, Giz Audio finds the quantity excessive and insufficiently controlled, reporting bleed into the lower mids; Currawong likewise calls it almost overwhelming with the wider nozzle.
Midrange
81/100
Audiokey Reviews hears a warm, nuanced and naturally toned midrange with strong detail and palpability. In contrast, Soundnews notes an upper-midrange roll-off and hollow effect, while Giz Audio hears veiling and recessed vocals caused by bass bleed and a midrange dip.
Treble
83/100
The FD5 earns repeated praise for its extension, air, clarity and grain-free presentation, with Audiokey Reviews considering it competitive with far more expensive models. Still, several reviewers identify a sharper edge: Soundnews finds the intensity elevated, Currawong reports tizzy peaks and occasional sibilance, and Audiokey notes a slight sibilant tendency at the very top.
Resolution Separation
85/100
Reviewers hear good transparency, clear microdetail and an ability to reveal subtle arrangement details. Separation is more variable: Currawong initially found a central blob with the wide nozzles before the narrower pair substantially improved definition, while Giz Audio considers detail merely competitive rather than exceptional at the price.
Soundstage Imaging
88/100
Spatial performance is a standout for several listeners, who describe a large, layered and sometimes holographic presentation with good depth, height and image solidity. Soundnews particularly praises its broad, airy 3D field, though Giz Audio finds width and imaging only average, especially through the midrange.
Dynamics Coherence
90/100
Enjoy The Music highlights effortless dynamics and purity of tone, while Soundnews praises clean decay and a slightly lingering bass character that benefits jazz and acoustic recordings. The single-driver presentation is generally described as smooth, liquid and cohesive rather than mechanically segmented.
FIT COMFORT ISOLATION PERFORMANCE 83/100
The FD5 can be comfortable for extended listening and offers strong passive isolation once properly fitted, but nozzle and insertion choices are unusually consequential. Multiple reviewers note that getting the right seal takes care, and tonal balance can shift materially with fit and nozzle selection.
Seal Stability
76/100
Fit is a meaningful variable with the FD5: Soundnews reports having to try more than 15 measurements to achieve a complete seal, while Enjoy The Music emphasizes that only a few millimeters of insertion can make a major difference. Currawong also notes that sufficient insertion depth is necessary for full bass power, though the broad tip selection helps users experiment.
Comfort
86/100
Soundnews describes the FD5 as comfortable over long sessions, and Currawong expects its rounded shells to fit most listeners comfortably. Currawong also cautions that the stainless-steel earpieces are heavy, which may not suit every ear over time.
Isolation
89/100
Enjoy The Music reports very effective outside-noise blocking in everyday use. Currawong adds that the narrow nozzles used with tri-flange tips can provide good isolation, although actual results will depend on obtaining the proper seal.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Accessories
91/100
Reviewers describe a polished chrome-plated stainless-steel shell with an attractive Art Deco faceplate, and Soundnews calls the finish flawless. The package is especially practical, including multiple nozzle options, a substantial lined case, varied ear tips, a connector-removal tool and balanced cable terminations in 2.5 mm and 4.4 mm.
Value for Money
90/100
At roughly $300 to $350, multiple reviewers call the FD5 affordable, a tremendous value or a product that punches above its price. Giz Audio is more reserved, describing it as broadly average for the asking price, but still not disappointing.
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- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- Addicted to Audio — online and in-store — Epping, Victoria, Australia (website)
- Advanced MP3 Players — online and in-store — Musselburgh, Scotland, United Kingdom (website)
- Alpha Audio Pte — online and in-store — Singapore, Singapore (website)
- Apos Audio — online and in-store — Oakland, California, United States (website)
- Audeos — online and in-store — Żywiec, Województwo śląskie (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Affair — online and in-store — Deritend, England, United Kingdom (website)
- Audio Basic — in-store — Singapore, Singapore (website)
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