FiiO K13 R2R – 24-bit True R2R DAC & Desktop Headphone Amplifier

FiiO K13 R2R – 24-bit True R2R DAC & Desktop Headphone Amplifier

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Fully differential true 24Bit R2R DAC resistor arrays |NOS/OS dualmodes 2400mW+2400mW powerful output|LDAc BluetoothDC/ACdualpowersuppliest10-band high-precision PEOFullybalanced audio amplifier circuit XLR+RCA... Read more

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    Description

    Fully differential true 24Bit R2R DAC resistor arrays |NOS/OS dualmodes 2400mW+2400mW powerful output|LDAc BluetoothDC/ACdualpowersuppliest10-band high-precision PEOFullybalanced audio amplifier circuit XLR+RCA preamplifier/line output.

    The Fii0 K13 R2R is a compact desktopDigital-to-Analog Converter(DAC) andheadphone amplifier that combines
    modern connectivity with a classic, highlysought-after conversion technology: theR-2R resistor ladder architecture. lt's
    designed to offer the smooth,natural, andmusically engaging sound signature ofR2R DACs in an accessible and user-
    friendly package.
    Key Features & Description
    1. Core Technology: Pure R-2R ResistorLadder DAC
    .Unlike the more common Delta-SigmaDAC chips, the K13 R2R uses a discreteresistor network to convert digitalsignals to analog. This method is oftenpraised for producing a more "analog.like," natural, and musically coherentsound with less digital harshness.

    Specifications

    • Weight: 200gr
    • Usage: Indoor & outdoor

    Pros and cons

    • Sustainably produced
    • Ideal for everyday use
    • May discolor in direct sunlight
    • Banner image for: <h2>Fully differential true 24Bit </h2><h2>R2R DAC resistor arrays |NOS/OS </h2><h2>dualmodes 2400mW+2400mW </h2><h2>powerful output|LDAc BluetoothDC/AC</h2><h2>dualpowersuppliest10-band high-precision </h2><h2>PEOFullybalanced audio amplifier circuit </h2><h2>XLR+RCA preamplifier/line output</h2>

      Fully differential true 24Bit

      R2R DAC resistor arrays |NOS/OS

      dualmodes 2400mW+2400mW

      powerful output|LDAc BluetoothDC/AC

      dualpowersuppliest10-band high-precision

      PEOFullybalanced audio amplifier circuit

      XLR+RCA preamplifier/line output

    • Banner image for: <h2>Fully differential True 24bitR2R DAC Resistor Arrays</h2>

      Fully differential True 24bitR2R DAC Resistor Arrays

      FllO's proprietary four-channel fully differential 24-bit R2Rresistor array

      DAc iscomposed of 48 precision thin-film resistors per channel, for a total of 192
      resistors across fourchannels, Each resistor features 0.1% accuracy and

      lowtemperature drift (30ppm). This R2R DAC allows the K13

      R2R to deliver auniquely rich and musical sound.

    • Banner image for: <h2>Comparison between fully differential and typical architectures</h2>

      Comparison between fully differential and typical architectures

      The K13 R2R employs a fully differential architecture that leads to lower noise,and fewer FFT harmonics, resulting in a darker music background.

    • Banner image for: <h2>Dual NOS/oS modes Double the fun</h2>

      Dual NOS/oS modes Double the fun

      NOS (Non-Oversampling) Mode: Maintains the original sampling rate for decoding, preserving authentic soundand allowing you to enjoy an organic and captivating musical experienceOS (Oversampling) Mode: Upsamples globally to a high sampling rate of 384kHz, for superior audio performanceand even more refined, clear sound.*The K13 R2R supports 1Bit DsD native decoding. When playing DsD tracks, slightly lower volume is a normal phenomenon. its recommended to adiust the volume to a normal listening level. in this mode, the menu setting SAM:0s wil be disabled.iIn different modes, the actual listening experience may vary depending on various subiective and obiective factors, Pleaserefer to your own personal listening experience.

    • Banner image for: <h2>Preamplifier + power amplifier outputDesktop decoding hub</h2>

      Preamplifier + power amplifier outputDesktop decoding hub

      With a wide variety of inputs and outputs, this unit functions as both apreamplifier

      and a power amplifier, catering to various listening preferences.It also supports PCM

      384kHz/32bit and DSD256 decoding, allowing it toeffortlessly process high-

      resolution audio signals to deliver rich sonic detailand for

      an outstanding listening experience.

    • Banner image for: <h2>Ten-band high-precision </h2><h2>PEQEffortless sound customization</h2>

      Ten-band high-precision

      PEQEffortless sound customization

      The K13 R2R, with the help of the XMOS XU316 platform,

      featuresspecially-developed PEQ*, with support for 10

      frequency bandadjustments across all operating

      modes. With FllO's proprietary turalgorithm,

      accessible through their app or web interface*,

      you caneasily utilize preset tunings like "Retro PEQ,"

      or even simulate andcorrect headphone frequency response

      curves. lt also supportsexporting, importing, sharing,

      and saving EQ curves, and auto-EQ.making

      sound tuning effortless.

    • Banner image for: <h2>Specially-designed power supply</h2>

      Specially-designed power supply

      DC/AC dual power supplies

      The built-in 30W switching power supply is protected by analloy

      nickel-plated shielding cover, which significantly boostsits

      anti-interference capabilities and ensures a cleaner powersupply.

      Additionally, it also features an external DC powerinput*, allowing

      you to pair it with a higher-performance linearpower supply for a

      different sound experience.
      *Supported external Dc power supply specifications are12V-2.5A

      (or greater than 2.5A) with a 5.5*2.1mm connector.

    • Banner image for: <h2>Robust output </h2><h2>Revealingevery last detail</h2><h2></h2><h2></h2><h2></h2>

      Robust output

      Revealingevery last detail

      Boasting a balanced output power of 2400mW+2400mW

      into a320 load, the K13 R2R can effortlessly drive both

      high-fidelitylEMs and headphones, unlocking their full

      potential and allowingthem to render every last detail.

    • Banner image for: <h2>Superior screenSuperior clarity</h2>

      Superior screenSuperior clarity

      A custom, high-contrast, long-lasting HDLCD display*

      clearly shows the device'scurrent status at a glance,

      includingsampling rate, volume, gain, and outputmode.

    <h2>Minimalist design With<br/>technological elegance</h2>

    Minimalist design With
    technological elegance

    The thickened, unibody aluminum alloy casing, pairedwith a brand-new "skylight" design, not only continuesthe k11 series’

    minimalist design language but alsointroduces a literal technological window into the R2Rresistor series.

    The flowing light and vibrant colorsshowcase a unique tech aesthetic.

    <h2>Dual-knob control</h2>

    Dual-knob control

    <h2>Infrared remote control</h2>

    Infrared remote control

    <h2>Fii0 Control App connection</h2>

    Fii0 Control App connection

    • Banner image for: <h2>Adjustable RGB logo lighting</h2><h2></h2><h2></h2>

      Adjustable RGB logo lighting

      With support for Bluetooth 5.4 and reception for the

      LDAC/AAC/SBC codecs, the K13 R2R allows you to

      beimmersed in a world of high-quality music

      even whenlistening wirelessly

    • Banner image for: <h2>Precisely designed Perfect performance</h2>

      Precisely designed Perfect performance

      Three gain levels, three independent volume curvesDiferent gain levels mean the K13 R2R is better able to adapt to various kinds of lEMs .

    • Banner image for: <h2>Overheating protection, overload protection</h2>

      Overheating protection, overload protection

      Protection mechanisms will automatically kick in when abnormal operating conditions aredetected to avoid damage to the unit, making it safer to use

    • Banner image for: <h2>Adjustable RcB lighting</h2>

      Adjustable RcB lighting

      Not only does the RGB lighting indicate the current audio sampling rate, but you can alsocustomize the brightness, colors, and whether it pulses or not.

    • Banner image for: <h2>1-99 minutes timer shutdown</h2>

      1-99 minutes timer shutdown

      Convenient functionality, meeting your needs
      *Timer shutdown works one time after being set each time

    • Banner image for: <h2>Parts list</h2>

      Parts list

      ①---------- K13 R2R*1
      ②---------- Infrared remote control*1

      ③ ----------AC power cord*1)

      4 ----------Quick start guide*1
      ⑤---------- Warranty card*1

      ⑥---------- Headphone adapter*1

      ⑦ ----------USB data cable*1

    • Banner image for:

    General Specifications

    Name/Model
    K13 R2R
    Working mode
    USB DAC mode/Coaxial decoding mode/Optical decoding mode/Bluetooth receiving mode
    Color
    Black/Silver
    Weight
    About 980g
    Hardware solution
    SoC: ESP32-S3, DAC: FIIO-developed R2R DAC, USB decoding: XU316, AMP: OPA1642*2+TPA6120A *2

    FAQ

    1. K13 R2R PEQ Control website, Quick start guide, Windows USB DAC driver and Fii0 Control APP download link

    ① K13 R2R Quick start guide download link: Click here

    ② FiiO USB DAC driver download (For Windows computer): Click here

    ③ FiiO Control APP: Click here

    For Android users, search “FiiO Control” in any application market to download it. Or directly download the APK files and then copy it to FiiO players or cell phones.

    For iOS users, search “FiiO Control” in App Store to download it.

    ④ PEQ control website: https://fiiocontrol.fiio.com/

    Note:

    1.Only windows and Macos system support web control; (Android or iOS system does not support)

    2.Please use Chrome, Edge, Opera and other browsers which support Web HID API to control properly.

    2.What should l do if the K13 R2R is abnormal?

    [No sound, noise, unable to boot, indicator light off, etc.]

    You can try the following methods to help you solve the problem:

    1. Restart K13 R2R;

    2. Re-plug the power cord.

    3.Check whether the AC/DC power supply is connected correctly. Check whether the AC/DC switch is selected correctly for the corresponding position. For AC power supply, please toggle the AC/DC switch to AC and turn on the AC IN switch. For DC power supply, please toggle the AC/DC switch to DC and use 12V power supply instead of other power supply like 9V or 15V.

    [Over-current protection]

    K13 R2R doesn't have over-current protection mechanisms but have overload and over-temperature mechanisms.

    When overload mechanism is triggered, the display will show OVERERR.

    When over-temperature mechanism is triggered, the display will show TEMPERR.

    After the protection is triggered, you must turn off the power to restore it. You can turn it off and then on through the knob, or replug the power supply to restore it.

    If the issue remains after restart, it means that the device may have a hardware problem. Please contact the seller or support@fiio.com about that.

    3.What accessories does the K13 R2R include? iR remote control explanation

    K13 R2R*1, AC power cord*1, Infrared remote control*1, USB data cable*1, Headphone adapter*1, Quick start guide*1, Warranty card*1

    4.0peration introduction for K13 R2R

    A. Power on/off

    The K13 R2R supports both AC and DC power supplies.

    When powered by AC, set the AC/DC power switch to the AC position, turn on the AC power supply, and connect the power cable for use.

    For external DC power supply, set the AC/DC power switch to the DC position, and ensure the DC power supply provides an output voltage of 12V and an output current of ≥2.5A. The DC connector specifications are 5.5 × 2.1 mm.

    When the K13 R2R is powered on, long press the volume knob or use the infrared remote control to turn it off. When the K13 R2R is powered off, briefly press the volume knob or use the infrared remote control to turn it on.

    B. Knob operation

    ①Switch working mode

    On the homepage, rotate the menu knob to enter the working mode menu. Rotate the knob to successively switch between USB IN, OPT IN, COAX IN and BT IN. After selecting the desired mode, short press the knob to complete the switch and return to the homepage. If you do not wish to switch modes, hold the knob to return to the homepage.

    ②Setting menu

    On the homepage, hold the menu knob for about 2s to enter the Settings menu. Rotate the knob to switch between different settings. When the current setting needs to be changed, short press the knob, and there will be flashing characters showing up on the menu. At this time, rotate the knob to switch between different settings, and short press the knob to confirm the setting. Then, the new setting will take effect with no character flashing anymore. Other settings can still be changed.

    On the Settings menu, hold the menu knob for about 2s to return to the homepage.

    ③Adjust volume

    On the homepage, rotate the volume knob to turn the volume up and down.

    When not on the main interface, turning the volume knob will immediately return the system to the main interface and display the current volume level.

    ④Quickly switching output

    On the homepage, double press the menu knob can directly jump to the output switching page, achieving the function of quickly switching output.

    ⑤Introduction to Settings menu

     

     

     

    SAM(Oversampling settings):

    The default option is OS and over sampling is on. When external audio datas transform to the K13 R2R, it will be oversampled and converted to a 384k sampling rate (in simple word: upscaling). Then the data will be sent to the R2R module for decoding. The purpose of oversampling is to change the distribution of quantization noise and improve the SNR.

    When the SAM option is set to NOS, oversampling is off. The audio data will be decoded and processed in its original sampling to present the original sound experience.

    DSD(DSD decoding mode):

    The default option is D2P. When playing DSD format tracks, the device internally employs SRC to convert DSD to PCM before decoding via the R2R module.

    When the DSD option is set to 1BIT: When playing DSD format tracks, no SRC processing is performed. Instead, DSD is 1bit DSD native decoding. (Note: When 1bit DSD native decoding is selected, the SAM: NOS/OS menu option is disabled.The software background will use NOS mode for decoding both DSD and PCM).

    5.K13 R2R signal input, output, gain description

    [Input supported by K13 R2R]

    K13 R2R supports USB, Coaxial input, Optical input,Bluetooth input, a total of 4 input methods, by rotating the menu knob in main interface to enter the working mode menu for switching working mode.

    (The K13R2R could remember the selected input mode still after restart.)

    [Output supported by K13 R2R]

    The output mode is determined by the OUT option in the settings menu.

    PO: Front panel headphone output at the same time, adjustable volume; Rear panel line output no output

    PRE: Rear panel line output output at the same time, adjustable volume; Front panel headphone output no output

    LO: Rear panel line output output at the same time, fixed at maximum volume; Front panel headphone output no output

    (Note: When switching between PO and PRE outputs, the system will independently remember the volume levels for each output mode.)

    [Which gain should I use when using headphones]

    K13 R2R supports three levels of gain, which could be switched in menu, respectively L/M/H, the corresponding gain is 0dB/6dB/12dB.

    The gain adjustment needs to be determined according to your earphones. It is recommended to use H gain for high impedance headphones, M gain for normal impedance headphones, and L gain for low impedance headphones.

    (Note: Gain is valid in PO mode and invalid in LO/PRE output mode.)

    6. How to use the K13 R2R as a USB DAC for mobile phones?

    To connect the K13 R2R to an Android phone, player or Apple phone, you need to purchase an additional Type-C to Type-C, lightning to Type-C OTG cable (such as LT-LT3) to connect:

    1. After the K13 R2R is turned on, use the OTG cable to connect to the mobile phone;

    2. K13 R2R input setting: Rotate the [INPUT] knob to switch to [USB IN] mode.

    (Both the rear and side USB ports can be used for USB decoding. If the two USB ports are connected simultaneously, the side one will prevail, and the rear one will be disabled.)

    3. K13 R2R output setting: switch to the corresponding output port according to the interface used.

    【OUT PO】Front panel 3.5mm + 4.4mm headphone output, typically connected to headphones

    【OUT LO】Rear panel LINE OUT + Balanced Out with maximum fixed output volume, not adjustable, typically connected to speakers/amplifiers with adjustable volume

    【OUT PRE】Rear panel LINE OUT + Balanced Out with adjustable output volume, typically connected to speakers/amplifiers without adjustable volume

     

    【Android phone】

    After the mobile phone is connected to the K13 R2R through the purchased OTG cable, the song can be played on the mobile phone. After being decoded by the K13 R2R, it is output from the headphone port to enjoy high-quality music.

    [Note] If there is no sound after you connect, you need to pay attention to the following points:

    1. Mobile phone playback software settings. If there is a USB output that needs to be turned on, some devices have to turn off the USB output to have sound;

    2. Confirm that the mobile phone developer mode has enabled USB debugging;

    The mobile phone needs to open USB debugging, open "Developer options", and then open "USB debugging" or "OTG" function;

    3. Confirm that the transfer cable supports OTG function, whether the direction of the cable is reversed;

    4.Please reconfirm that the K13 R2R has been switched to USB IN mode, and that the output port settings match the headphones/speakers currently in use.

    5. Since the USB audio of various brands of mobile phones is not standardized at present, FiiO does not guarantee full compatibility. According to the above connection method, if it is not supported, it is recommended to try other mobile phones or connect to the computer DAC to rule out whether the hardware of some devices is bad (such The probability of the situation is small), if you can’t connect to the computer, you can contact our customer service for further confirmation.

     

    【iPhone/iPad】

    It is necessary to purchase a Lightning to Type C cable with OTG function (such as FiiO LT-LT3). Connect K13 R2R and iPhone/iPad/iPod, play songs and enjoy high-quality music.

    【Note】

    1. Only Apple devices with iOS10.0.2 and above systems are supported. Those with versions lower than this version can not be supported due to the Apple system itself;

    2. When the iOS device is decoding, adjusting the volume of the iOS device is invalid and needs to be adjusted on the K13 R2R.

    7.How to use the K13 R2R as a USB DAC for computer?

    【Windows computer: Only support Win10 or above】

    1. Install the v5.72.0 or above version FiiO DAC universal driver on the computer;

    Driver download link: Click here

    2. K13 R2R input setting: After turning on the K13 R2R, rotate the [INPUT] knob to switch to [USB IN] mode.

    3. K13 R2R output setting: switch to the corresponding output port according to the interface used.

    【OUT PO】Front panel 3.5mm + 4.4mm headphone output, typically connected to headphones

    【OUT LO】Rear panel LINE OUT + Balanced Out with maximum fixed output volume, not adjustable, typically connected to speakers/amplifiers with adjustable volume

    【OUT PRE】Rear panel LINE OUT + Balanced Out with adjustable output volume, typically connected to speakers/amplifiers without adjustable volume

    4. Connect the computer and K13 R2R through a square USB data cable, set the audio output of the computer system and the audio output of the playback software to K13 R2R and then use it.

    (Both the rear and side USB ports can be used for USB decoding. If the two USB ports are connected simultaneously, the side one will prevail, and the rear one will be disabled.)

    5. With a computer: How to play general lossless tracks and music in DSD format? Click to view

    When using the K13 R2R UAC mode to connect to a computer for music playback, occasional audio dropouts or USB recognition issues may occur:

    This is because the front-panel USB ports on some computers may experience unstable signal transmission compared to the rear-panel USB ports. This instability can lead to occasional audio dropouts or USB recognition failures. If you encounter such issues, please try connecting to a USB port on the back of the computer.

    【MAC computer】

    1. MAC computer does not need to install the driver, just change the sound output device to K13 RR after connection.

    2. It is recommended to adjust the system volume to the maximum, and adjust the output volume of the machine by adjusting the potentiometer.

    Apple computer DAC setting introduction: Click here

    Notice: When K13 R2R is connected to Mac, it can play DSD tracks up to DSD256. This is because under OSX, the DoP can only support DSD256.

    【Linux computer】

    The Linux system is driver-free. In theory, it can be used directly by connecting it directly. However, due to the large number of versions, it can not be guaranteed that all systems can be adapted. If it is connected, it is recommended to use another data cable or USB port to check. is not supported.

    8.How to use the coaxial and optical decoding function of K11?

    1.After powering on the K13 R2R, rotate the [INPUT] knob to switch the input mode of K13 R2R to the corresponding input: OPT IN (optical fiber), COAX IN(coaxial), and connect to the corresponding optical fiber/coaxial input line;

    2.K13 R2R output setting: switch to the corresponding output port according to the interface used.

    【OUT PO】Front panel 3.5mm + 4.4mm headphone output, typically connected to headphones

    【OUT LO】Rear panel LINE OUT + Balanced Out with maximum fixed output volume, not adjustable, typically connected to speakers/amplifiers with adjustable volume

    【OUT PRE】Rear panel LINE OUT + Balanced Out with adjustable output volume, typically connected to speakers/amplifiers without adjustable volume

    3.Scroll the volume knob and adjust the volume of the K13 R2R to a suitable level before playing music. And select the GAIN (gain) according to personal preference;

    4.Play music on the front device to enjoy the music.

    Note: When there is no output from the K13 R2R, please try to play other music first.You can also check whether the output settings for the front-end device are correct.

    9.How to use the Bluetooth receiver function of K13 R2R?

    1.After powering on the K13 R2R, rotate the [INPUT] knob to switch to [BT IN] mode.

    When switched to the Bluetooth receiving mode for the first time, the K13 R2R will automatically enter the pairing state. At this time, the screen of the K13 R2R will display “PAIRING”. Find and select K13 R2R in your phone's Bluetooth page to connect.

    2.K13 R2R output setting: switch to the corresponding output port according to the interface used.

    【OUT PO】Front panel 3.5mm + 4.4mm headphone output, typically connected to headphones

    【OUT LO】Rear panel LINE OUT + Balanced Out with maximum fixed output volume, not adjustable, typically connected to speakers/amplifiers with adjustable volume

    【OUT PRE】Rear panel LINE OUT + Balanced Out with adjustable output volume, typically connected to speakers/amplifiers without adjustable volume

    3.Scroll the volume knob and adjust the volume of the K13 R2R to a suitable level before playing music. And select the GAIN (gain) according to personal preference;

    4.Play music on the front device to enjoy the music.

    Troubleshooting:

    If your phone cannot detect the K13 R2R Bluetooth device, please try these solutions:

    1.Switch the K13 R2R input mode (e.g., switch to USB then back to BT mode).

    2.Replug the power supply for the K13 R2R, then search for the connection again.

    3.In the settings menu, select RESET and confirm. When the Y/N prompt appears, choose Y and briefly press the menu knob to confirm. This operation will restore the K13 R2R to factory settings. Then attempt to connect again.

    10.How to control the K13 R2R in the FiiO Control App?

    Here are the steps to control the K13 R2R in FiiO Control App.

    1.Please update the FiiO Control App to the latest version (Click the link to get the latest Android version:

    https://forum.fiio.com/note/showNoteContent.do?id=202105071628040377809&tid=17

    2.Ensure that the FiiO Control App is the latest version. Enter My devices->Tap the BTR17 to complete the connection. After a successful connection, it will enter the Bluetooth control menu.

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