FiiO FF3S Large 14.2mm Dynamic Driver In-Ear Earphones [b-Stock]



B-Stock product, (read below) in excellent condition with original packaging, 2 year warranty.

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64,75 €

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Brand: FiiO


FiiO FF3S 14.2mm Dynamic Driver In-Ear Earphones

  •     Interchangeable cable (0.78mm 2 pin)
  •     Interchangeable twist-lock connector 3.5mm and 4.4mm
  •     Aluminum alloy construction
  •     14.2mm dynamic driver
  •     Beryllium-coated dome + PU sealing cone
  •     2 types of foam covers included (crisp and bass sound)
  •     High purity silver plated monocrystalline copper cable

Great sound and shape - "drum" bass chamber

Inspired by the musical instrument drum, a bass cavity has been specially developed for the new FF3S headphones. This cavity has been specially designed to take full advantage of the resonances and better bring out the texture of the bass tones, accurately reproducing the wood of the music with surprising agility.

Lightweight with exceptional feel - aluminum alloy construction

The brand new FiiO FF3S comes with an improved build quality. The FF3S features an aluminum alloy construction with a matte finish, giving it a subtle but much more luxurious look than its predecessor. Another advantage of the aluminum alloy is its lighter weight. Each FF3S earbud weighs just 3.9g, making them 52% lighter than the FF3. This offers a whole different level of comfort for longer listening sessions, especially for those whose ears are very sensitive to weight.

Included silicone wing hooks

The FiiO FF3S come with silicone wing hooks as standard to ensure the earphones stay in your ears. No matter where you go, let high-fidelity music accompany you.

Wired headphones with untethered possibilities - 0.78 mm 2-pin detachable cable

FiiO has listened to user feedback and equipped the FF3S with a detachable 0.78mm 2-pin cable, giving users endless upgrade possibilities to enhance their listening experience. In addition, an easy-to-feel dot has been added to the left earbud to help differentiate between left and right earbuds and ensure a truly ergonomic design.

Immerse yourself deeper in your music - Bass-boosting acoustic flute design

FiiO's R&D department has fully utilized the interior space of the FF3S housing to incorporate a bass-boosting acoustic tube. This tube expands the airflow path, increases air damping and improves sound attenuation to lower the resonance point of the headphones and achieve amazing sound performance. As a result, the FF3S can reproduce frequencies of up to 90 Hz in normal, open-back wearing [1] and has an effective frequency range [2] of up to 42.5 Hz for truly deep earphone bass.

[1] Normal wearing conditions for earplugs without the use of a sponge cover.

[2]Effective frequency range refers to the frequency range in which the frequency response is no more than 10 dB below a certain sound pressure range.

*The above test data are results from FiiO Labs. *Audio test equipment: APx555B+Brüel & Kjær Head and Torso Simulator (HATS) 4128C

More than just big 14.2 mm dynamic driver

Thanks to its large 14.2 mm dynamic driver, the FiiO FF3S can release more energy when playing music for a clean and natural sound. Experience the powerful sound of beating drums and energetic dynamics in your music with the FF3S.

Specially selected materials - beryllium-coated dome tweeter + PU sealing membrane

A good sound depends not only on the size of the driver, but also on the materials it is made of. After numerous tests by the FiiO research team, a dynamic driver with a beryllium dome and PU seal was selected for the FF3S. The beryllium-coated diaphragm is very stiff and at the same time lightweight, which reduces unwanted vibrations and therefore unwanted distortion. PU is used for the seal of the dynamic driver, whose properties enable a more detailed and structured bass. Not only does the bass come across beautifully, but the mid-range frequencies of human voices are also rich and the treble has also been greatly improved - with an effective frequency range of up to 17 kHz. [3] A larger effective frequency range also has the advantage of creating the impression of a larger sound stage.

[3] The effective frequency range is the frequency range in which the frequency response is no more than 10 dB below a certain sound pressure level.

Capturing every detail - ultra-fine copper-clad aluminum voice coil made from Japanese Daikoku

Excellent sound comes from careful consideration of all design aspects of the product, including the parts that are not easily seen in use. The dynamic driver of the FF3S features an ultra-fine copper-clad Daikoku voice coil. With a diameter of just 0.033 mm, the Daikoku voice coil is very light and helps to reduce the overall weight of the dynamic driver, allowing it to move faster and further improving treble resolution.

Listen to your heart's content - 2 types of sponge covers included

The FF3S comes standard with 2 types of sponge covers for different sound types - bass boosting and transparent. Choose the covers you want to use for different styles of music and to suit your own taste.

Fully equipped High-purity, silver-plated monocrystalline copper cable

The FF3S cable consists of a total of 152 cores of high-purity, silver-plated, monocrystalline copper. This was specially selected because the silver plating improves the resolution of the treble and at the same time reduces unwanted sibilance. The cable's jacket is made of German TPU, which not only makes the cable resistant to yellowing and hardening, but also allows the cable to be more flexible, making it more comfortable to wear and reducing unwanted microphonics.

Wide compatibility - interchangeable twist-lock plugs

The FiiO FF3S is equipped with an all-aluminum interchangeable twist-lock plug, allowing you to switch between 3.5/4.4 mm plugs at any time. This makes it even easier to enjoy the exemplary sound of the FF3S, setting a real benchmark in its class.


Headphone type: Dynamic drivers

Frequency response: 20Hz-20kHz

Driver type: Dynamic driver

Impedance: 45Ω@1kHz

Sensitivity: 105dB (1kHz@1mw)

Maximum input power: 100mW

Cable: 152 cores high-purity silver-plated monocrystalline copper

Headphone connector: 0.78mm 2pin

Audio plug: Including 3.5/4.4mm twist-lock plug (interchangeable)

Cable length: Approx. 120cm

Weight: 3.9 g per earphone (without cable)

List of items included:

  • Earphones*1
  • Earphone cable*1
  • Transparent sponge covers: 6 pairs (with hole), bass sponge covers 6 pairs (without hole), anti-slip silicone rings M 3 pairs (transparent black), anti-slip silicone rings L 3 pairs (transparent black), silicone wing hooks 1 pair (transparent black)
  • Detachable 3.5/4.4 mm audio plug*1 (3.5 mm plug pre-installed)
  • User manual

A ´B-Stock´ is a product which has been returned by a customer within their 14/30 Day Money Back Guarantee.
These items are offered at a special, reduced price. Please note, that occasionally the packaging is no longer in pristine condition.
B-Stock products are in full working order and are checked by specialists before releasing them as B-Stock. They come with the full 2 year warranty as any other new product.
Any special comments about a B-Stock product will be noted at the beginning of the article description.


FiiO logo

About FiiO Electronics Technology Co., Ltd.

01 Brand Introduction - HiFi+Fashion

FiiO Electronics Technology Co., Ltd. was established in 2007.  It is a high-tech enterprise that combines research, development, production and sales, and its sales are mainly based on its own FiiO brand as opposed to OEM/ODM.  It focuses on digital audio, with current mainstay products being portable headphone amplifiers, DAC / amps and portable digital audio players.

FiiO: It is composed of Fi (Fidelity) from HiFi and iO (represents number 1 and 0) which indicates the sincerer feeling and more convenient life the digital tech has brought to us.

飞傲: The Chinese transliteration of FiiO, as well as representing youthful vigor and the active & innovative spirit of the company.

Audio products are meant to fulfill the spiritual pleasure of users.

  1. FiiO provides products and service related to music.
  2. We also hope to bring happiness to our users with the provided products and service, which is also the key value of FiiO.

Customer Service

  1. Good after-sales service, more reliable
  2. Great user experience, more pleasure
  3. Variety of activities, more involved

About products

  1. Affordable: FiiO products are well-known for its feature of high cost-performance. Lowering the entry level to make more customers can afford.
  2. Easy to use: FiiO pays great attention to the user experience. We are not only provide products with high quality, but also easy to use and with long lasting durability.
  3. More accessories bring more fun: Enable to play in a variety way and use under more possible environments.
  4. Updates available: Equipped with a variety of ports, it makes the music players can still connect to external amp/DAC for upgraded enjoyment.
  5. Endless transformability available: With replaceable amp module and expandable storage, the X7 can bring more playability.

02 Company Profile

Research & Development Team

  • Twenty years of R&D experience in audio products
  • Former core R&D team for audio products from OPPO
  • A team of 20 professional R&D engineers in software, hardware, industrial design, structure and electro-acoustic.

Research & Development Investment

FiiO keeps bringing in advanced equipments and high-tech talents so as to ensure the stable growth and long term competitive edge. Up till now, the team size has expanded three times than that of 2007 when we established.

Team Composition

The R&D team is made up of development dep, engineering dep and QC dep, with 60+engineers in total.

Authorized certifications

FC, CE, KC, CCC and ISO9001:2008 ensure the safety and quality of the products.

Production management

FiiO has strict requirements to production with almost “zero tolerance” even to small problems, which is strictly in compliance with the International Quality Management System ISO9001. 

QC Equipment 

  • a. AP audio analyzer (valued at 200,000RMB).
  • b. Life-span test platform against high & low temperature, swing and plug & unplug trial.
  • Aging test carriage towards mass production.
  • Aging test machine under high & low temperature.

Customer oriented

Driven by customers’ needs, we innovate constantly and response promptly to the market changes. We develop new products based on customers’ needs and compete for more market shares.

Company culture - Our Vision

Present the world a better “Made in China”.

Brand Spirit

  • Innovation

the earliest company that designed the minimum volume headphone amplifier. First dockable amp & DAC product. First amp specially designed for iPod/iPhone. First amp with adjustable power supply and power supplied by mobile phone battery. First multifunctional headphone amp & DAC for Android smarphone. First Hi-Res music player at a price lower than 1000RMB supporting 192K music. First Android-based Hi-res music player. 

  • Quality

Repair Rate < 1%. Sound Quality Control system. Original components imported from TI, Wolfson, Maxim. Company-wide quality control. +20 quality engineers and inspectors. Complete testing facilities. 

  • Service

CEO at the frontline of customer service. 100% response to enquiries. The most popular headphone amplifier brand on Head-Fi. First class website and contents in the audio industry. Interaction with and support to customers on Facebook and Microblog (twitter-like social website).

Brand Mission

FiiO designs, produces and sells high-quality products at favorable prices to those who love music and style.

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FiiO FF3S Large 14.2mm Dynamic Driver In-Ear Earphones [b-Stock]

B-Stock product, (read below) in excellent condition with original packaging, 2 year warranty.

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