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FiiO K11 R2R High-Performance Desktop DAC and Headphone Amplifier

FiiO K11 R2R High-Performance Desktop DAC and Headphone Amplifier

FiiO K11 R2R High-Performance Desktop DAC and Headphone Amplifier

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FiiO K11 R2R High-Performance Desktop DAC and Headphone Amplifier

High-Performance Desktop R2R DAC/AMP.
Fully Differential 24-Bit R2R Resistor Array.
NOS/OS Dual-Mode Free Switching.
Professionally Designed Electronic Volume Control Chipset(NJW1195A).
Supports 32-Bit/384kHz PCM and Native DSD256 Audio Signal Processing.
Professional Audio Amp Circuit.
1300mW+1300mW Strong Output.
Three-Levels Adjustable Gain.
Specially Designed Low-Noise Power Supply.
6.35mm+4.4mm Dual Headphone Output Options.
High-Quality Emerald Solid-State Capacitors.
Customized LCD Display Screen.
Global RGB Logo Light.

FiiO has unveiled a new R2R model for its renowned K11 desktop DAC/AMP. Featuring a custom-built fully differential 24-Bit R2R Resistor Array, the K11 R2R provides listeners with a smooth and rich audio experience. It includes dual NOS/OS operating modes, each offering distinct sound qualities. The DAC/AMP comes with two headphone output options: a 6.35mm single-ended port and a 4.4mm balanced port. With a robust amplifier section that includes three-level adjustable gain and high-quality emerald solid-state capacitors, the K11 R2R delivers a powerful output of 1300mW per channel. Enjoy the rich, smooth, organic R2R sound with the FiiO K11 R2R, available now!

Fully-Differential 24-Bit R2R DAC Array

FiiO has incorporated its newly designed four-channel fully differential 24-bit R2R resistor array in the K11 R2R. This array consists of 48 resistors per channel, totaling 192 high-precision ultra-thin film resistors with 0.1% accuracy and minimal temperature drift across the four channels. This design ensures a clean, crisp output with a dark background, thanks to the specially developed audio circuit architecture.

NOS/OS Dual Operating Modes

The FiiO K11 R2R offers dual operating modes: NOS (Non-Oversampling) and OS (Oversampling). These modes can be switched freely and provide distinct sound characteristics. NOS mode retains the original sampling rate during signal processing, resulting in a more musical presentation, while OS mode upsamples all signals to 384kHz, offering more detail and clarity.

Powerful Amp Section

The K11 R2R is equipped with a professionally designed amplifier circuit, including Ti OPA1642 as low-pass filters and dual SGM8262 professional-grade operational amplifiers. With an output power of up to 1300mWx2, the K11 R2R can easily drive demanding headphones. It also features three-level gain modes for compatibility with both sensitive and high-power equipment. The device uses the NJW1195A precise digital volume chipset for accurate volume adjustments with low distortion between channels.

Dual Headphone Output Ports

The K11 R2R includes dual headphone output ports: a single-ended 6.35mm port and a balanced 4.4mm port. This allows users to pair a variety of IEMs and headphones with the K11 R2R, enjoying high-resolution music in all its glory.

High-Resolution

The FiiO K11 R2R supports high-resolution audio signal decoding, including PCM and DSD processing up to 32-bit/384kHz PCM and DSD256. DSD256 requires the DSD output mode to be set to native, and it is internally converted to PCM for R2R signal processing.

Power Supply

The K11 R2R features a professionally designed low-noise power supply, comprising 17 low-noise LDO precision voltage regulator ICs and 2 DC-DCs for a multi-channel power supply. It also benefits from an external 12V power supply, ensuring a clean output with minimal noise and distortion. The K11 R2R delivers high-quality sound to its users.

Specifications

DAC: fully differential true 24-bit R2R resistor arrays
Main control chip: GD32F303RET6
Output 6.35mm single-ended L+R≥460mW+460mW (32Ω, THD+N＜1%) / L+R≥50mW+50mW (300Ω, THD+N＜1%)
Output 4, 4mm balanced L+R≥1300mW+1300mW (32Ω, THD+N＜1%) / L+R≥220mW+220mW (300Ω, THD+N＜1%)
Inputs: USB Type-C, Coaxial, Optical
Outputs: 1 x 6.35 mm (single-ended) / 1 x 4.4 mm (balanced) / 1 x L/R RCA / 1 x Coaxial
USB input decoding: PCM 384kHz/32-bit / DSD 256
Coaxial input decoding: PCM: 192kHz/24-bit
Optical input decoding: PCM 96kHz/24-bit
Line-Out (LO) mode Power-Out (PO) mode
Display: 1.1-inch LCD VA segment display
Adjustable RGB illumination
Dimensions: 147 x 133 x 32.3 mm

Weight: 420 g

List of items included:

1x FiiO K11 R2R
1x power supply
1x USB data cable
1x quick start guide
1x 6.3 to 3.5mm jack adapter

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.

FiiO provides products and service related to music.
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

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

About products

Affordable: FiiO products are well-known for its feature of high cost-performance. Lowering the entry level to make more customers can afford.
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.
More accessories bring more fun: Enable to play in a variety way and use under more possible environments.
Updates available: Equipped with a variety of ports, it makes the music players can still connect to external amp/DAC for upgraded enjoyment.
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.

Reviews(1)

Overall rating

1 Review

Quality

(5)

Maurizio

Dopo avere letto altri positivi commenti su questo Dac ed incuriosito dal tipo di conversione R2R ho deciso di acquistare questo Dac. Spedizione come al solito veloce e puntuale con BRT da parte di Playstereo. Dopo il canonico rodaggio di circa 100 ore posso dire che il suono di questo Dac è quello che andavo cercando da tempo. Dolce ed analogico, privo delle asprezze e degli artefatti tipici dei Dac delta-sigma. Assolutamente delizioso in modalità NOS con materiale HiRes (da 96kHz in sù). Questo Dac è dotato di 96 resistenze per canale in configurazione bilanciata. Purtroppo non è presente l'uscita linea bilanciata ma è presente quella bilanciata per cuffie attraverso la quale a mio parere il suono è migliore. L'alimentazione è a 12 Vdc attraverso un alimentatore esterno switching. Ho l'impressione che il suono migliori ulteriormente con una alimentazione lineare ed a tal fine per gli ascolti più critici lo alimento con una batteria al piombo gel da 12V 7.2 Ah. Ottima sinergia con le Mest II in low gain dall'uscita bilanciata. Lo preferisco e di molto al Mojo e all'Ifi Micro. Il suo punto di di forza a mio avviso sta nel realismo con cui vengono riprodotti gli strumenti acustici. Ad esempio la tromba è riprodotta con notevole realismo con tutte le armoniche del suono dal vivo, in confronto quella degli altri due dac sembra la tromba di un sintetizzatore. Se non si era capito il K11 R2R mi è piaciuto molto e a questo prezzo, pur con i limiti citati, è regalato.