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FiiO F9
F9
F9
Triple Driver Hybrid In-Ear Monitors
Hi-Res Audio Certification
The F9 has been certified by the Japan Audio Society to be "Hi-Res Audio" capable. This means that the F9 is capable of a frequency response up to 40kHz, which can fully reproduce the audio and give you a natural and life-like listening experience that truly lets you listen to the music the way the artists wanted it to sound.
1 Dynamic Driver & 2 Balanced Armatures for Triple helpings of rich sound
The F9 utilizes a hybrid design in which each channel is composed of one dynamic and two balanced armature (BA) drivers. The 9.2mm dynamic driver is specifically tuned to produce bottomless lows while the two BA drivers precisely portray extended upper-mids and highs.
Freely switch between balanced and single-ended with standard MMCX connectors
The F9 utilizes the standard MMCX connector for its interchangeable cables, and comes standard with both 2.5mm balanced and 3.5mm single-ended cables.
The 2.5mm balanced cable is made of silver-plated copper wire, which ensures a balanced sound signature and a high level of detail retrieval. Of course, due to its balanced nature, the left and right channel wires are separated so that there is significantly greater channel separation - leading to a richer, more detailed musical experience.
The 3.5mm single-ended cable comes with a full set of in-line controls capable of playing/pausing songs, switching tracks, volume adjustment, and even calls with its high-quality microphone. This makes the F9 a perfect complement to enhance your experience with your portable audio player or cell phone.
Making Waves with an Organic Design
The F9's stunning exterior was inspired by something familiar we are all accustomed to: water. The sleek lines recall the ripples that occur when drops of water fall into a lake, making the F9 both more human and familiar.
Organic Strength
The ripple-like lines on the F9 not only give it a unique touch, but also serve to ensure structural strength and maximize the amount of space internally for a more optimized design overall. Moreover, the inside layer of the F9's shell is specially lined with plastic to both better secure the drivers and eliminate internal resonances.
Colossal Energy from a Tiny Body
You would never imagine that such a grand sound could come from something as tiny as the F9. Due to the way we have cleverly packaged the naturally-detailed BA drivers and the traditionally vast-sounding dynamic driver, we have achieved a fully cohesive sound that you would normally not think is possible from a puny in-ear monitor.
Precision Craftsmanship
The F9's outer aluminum shell is meticulously crafted using CNC systems – impressive already, but it doesn't stop there. The shells are then carefully hand-polished and matched, before going through sandblasting and anodization. This complex overall process ensures that the F9 has a masculine, robust shell that is yet encapsulated in a tender beauty.
PEK polymer nanocomposite driver for heightened detail
The F9 utilizes a dynamic driver made of PEK (polyether ketone) polymer nanocomposite, known for not only being tough but also being light. This allows the F9's dynamic driver to be highly capable of producing quick, detailed, and extended bass.
Scientifically Tuned based on Physics and Psychoacoustics
We achieved maximum performance from the F9's drivers by looking to the laws and principles of physics and psychoacoustics when designing our product. By doing so, the drivers are able to work in perfect harmony to achieve a cohesive sound that is absolutely able to reproduce every part of the sound frequency spectrum – allowing for a frequency response from 15 Hz to 40 kHz.
Over-the-ear design for an enjoyable experience
After much testing and feedback from a wide variety of users, we came up with an over-the-ear design that is not only ergonomic but also comfortable. With the F9, you can easily get lost within your music for hours without fatigue.
Outgoing red or serene black?
Choose red for an unreserved and vigorous look, or go for black for an understated and sophisticated appearance.
Unexpectedly Thoughtful AccessoriesUnexpectedly Thoughtful Accessories
Besides the 2.5mm balanced and 3.5mm single-ended cables, the F9 comes with a whole host of other accessories all designed to tailor and safeguard your listening experience. For instance, the F9 comes with two different kinds of ear tips – one set optimized for bass while the other is designed for a more balanced presentation. Each type of ear tips comes in small, medium, and large sizes. The color of the ear tips is even matched to the color of your F9 unit! We give you control over your listening experience, so you can listen however you want, whenever you want. The F9 also comes with our popular waterproof carrying case, so you can be rest assured that your earphones will continue to function for years to come.
Thoroughly Tested Before Being Delivered to You
We conduct dozens of stringent quality tests, thousands of times, so that you may cast your worries away and your fears are allayed.
Driver Type
1 Dynamic + 2 BAs
Headphone Type
Over-the-ear
Frequency Response
15Hz - 40kHz
Maximum Input Power
100mW
Sensitivity
106dB/mW
Impedance
28Ω
Single Earbud Weight
3.76g
Plug Type
3.5mm+2.5mm
Cord Length
120cm
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Professional Reviews 83/100
Nicely Roasted
Sound Quality
79/100
Fit Comfort Isolation
87/100
Build Accessories
89/100
Value for Money
88/100
The F9 delivers clean, controlled bass and an energetic, mildly V-shaped tuning that gives percussion real sparkle without mid-bass blur. PortaFi highlights its spacious presentation, secure fit and comprehensive kit, while Joshua Valour rates the robust metal build and balanced cable as key everyday advantages. It is a compelling hybrid IEM for crisp, lively listening.
What Reviewers Are Saying
Pros
Clean, low-reaching bass delivers satisfying weight without blooming into the midrange.
Energetic treble brings clarity and definition to percussion, with a commendable sense of width and depth for the class.
Strong ownership package: robust metal shells, detachable cables, carry case and a balanced cable included.
Secure, comfortable ergonomic fit and above-average passive isolation suit everyday portable use.
&
Cons
Recessed lower mids leave male vocals and vocal texture less immediate or detailed.
Upper-treble emphasis can expose sibilance and make cymbals too prominent for treble-sensitive listeners.
SOUND QUALITY PERFORMANCE 79/100
The F9 is described as a clean, mildly V-shaped hybrid with controlled low end, an energetic upper range and a generally pleasant presentation. Its main limitations are recessed lower mids, only moderate vocal texture and a treble peak that can make sibilants or cymbals too prominent for sensitive listeners.
Bass
85/100
Both reviewers find the bass clean and controlled rather than bloated, with good low-frequency texture and little intrusion into the midrange. Sub-bass reaches low and delivers satisfying weight, though the attack is described as substantial rather than especially fast or sharp.
Midrange
77/100
The midrange sits behind the bass and treble to create the F9's V-shaped presentation. Lower mids and male vocals can sound recessed, while female vocals benefit from upper-mid emphasis; Joshua Valour also finds vocal texture and detail limited.
Treble
76/100
Treble has confident presence and an 8 kHz lift that can add clarity, definition and excitement to percussion. That same emphasis can bring out sibilance, while the uppermost treble rolls off enough to limit air and fine-detail retrieval.
Resolution Separation
77/100
The F9 separates vocals cleanly enough, and PortaFi considers midrange resolution respectable. However, reviewers note limited vocal texture and microdetail, with a slightly dry character that can expose rough recordings rather than smoothing them over.
Soundstage Imaging
82/100
PortaFi finds the stage commendable for the price, with useful width, depth and separation between layers. Joshua Valour is more reserved, calling imaging and staging middle-of-the-road, so the spatial performance is competent rather than a defining strength.
Dynamics Coherence
75/100
Reviewers describe a weighty, enjoyable bass impact and no major tonal faults, suggesting a generally cohesive listen. They say comparatively little about large-scale dynamic swings or transient nuance, and the F9 is not presented as unusually lively or sophisticated in this respect.
FIT COMFORT ISOLATION PERFORMANCE 87/100
The rounded housings are reported to sit securely and comfortably, without protrusions that cause discomfort. Passive isolation is above average and suitable for most noisy environments, though it is not portrayed as class-leading stage-monitor isolation.
Seal Stability
87/100
PortaFi reports that the F9 fits well and remains securely seated. No reviewer identifies recurring seal loss, fit instability or fit-related bass changes.
Comfort
90/100
The ergonomic rounded shape is specifically praised for avoiding protrusions and discomfort. The available feedback describes the F9 as an easy and comfortable in-ear fit.
Isolation
84/100
PortaFi characterizes passive isolation as slightly above average and sufficient for most noisy surroundings. It is a useful everyday level of attenuation rather than an extreme-isolation design.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Accessories
89/100
The fully metal shells are praised as well assembled, and the package is described as unusually comprehensive. Reviewers provide little direct long-term durability commentary, but the reported construction and included kit make for a strong ownership package.
Value for Money
88/100
At roughly $100, PortaFi considers the F9 a very good offering, helped by its extensive package, solid construction and engaging sound. Joshua Valour judges its sound appropriate for the asking price rather than markedly above it, making this a justified purchase rather than a standout bargain.
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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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