FiiO K19 – Flagship Desktop DAC & Headphone Amplifier with 8 W/Ch

FiiO K19 – Flagship Desktop DAC & Headphone Amplifier with 8 W/Ch

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Studio-grade flagship DAC andheadphone amplifier K1931 -band high-precision lossless PEQ |8000mW+8000mw powerful outputESS 8 channel flagship DAC ES9039SPRO*2 |8 channel... Read more

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    Description

    Studio-grade flagship DAC andheadphone amplifier K19
    31 -band high-precision lossless PEQ |8000mW+8000mw powerful outputESS 8 channel flagship DAC ES9039SPRO*2 |8 channel THX AAA 788+High performance ultra-low phase noise femtosecond crystal oscillatorGlobal clock management  Ultra-thin die-cast unibody shock-proof construction Fully.

    The FiiO K19 is the undisputed flagship ofFiiO's product line, representing thezenith of their technological achievementin desktop DAC/Amplifiers.lt is
    engineered not merely as a component,put as a complete,reference-grade audicsystem for the most critical listeners andprofessionals.The K19 consolidates evercutting-edge technology in FiiO's arsenalinto a single, formidable chassis, offeringunparalleled performance, connectivity and control.
    Key Features & Description
    1.Unprecedented Dual-DACArchitecture:ES9039SPRO
    ·At its core, the K19 utilizes a dualES9039SPRO DAC configuration,thehighest-performance 8-channel DACchip from ESS Technology. These chipsare configured in a fully discrete, dual-mono desian where each chip isdedicated to a single audio channel.

    Specifications

    • Weight: 200gr
    • Usage: Indoor & outdoor

    Pros and cons

    • Sustainably produced
    • Ideal for everyday use
    • May discolor in direct sunlight
    • Banner image for: <h2>K19</h2><h2>Studio-grade flagship DAC and</h2><h2>headphone amplifier K19</h2>

      K19

      Studio-grade flagship DAC and

      headphone amplifier K19

      31-band high-precision lossless PEQ |8000mW+8000mW powerful output

      ESS 8 channel flagship DAC ES9039SPRO*2 |8 channel THX AAA 788+

      High performance ultra-low phase noise femtosecond crystal oscillator

      Global clock management | Ultra-thin die-cast unibody shock-proof construction Fully

    • Banner image for: <h2>Innovative,31-bandhigh-precision lossless PEQ</h2>

      Innovative,31-bandhigh-precision lossless PEQ

      The K19 features DEL (Dual Engine Limiter) technology,

      andthrough proprietary algorithms, the Kl9 can apply

      variousaudio effects such as dynamic range compression (DRC)

      anddynamic range enhancement (DRE) as well as an advancedlimiter

      to prevent clipping. Also on the K19 is an adjustable31-band high-precision

      lossless PEQ*, which supports directadjustment of PCM 44.1k-192k audio signals

      withoutresorting to sampling rate conversion (SRC). For each band.the gain can be

      adjusted between a range of+12--24dB andthe Q value can be adjusted between a range

      of 0.4dB-128dBAnd the PEQ curves don't have to be used only

      by you-PEQpresets on the Kl9 can be shared

      between users. Being able toimport and export PEQ presets opens up a whole newdimension to sound adjustment!
      *PEQ adjustment is supported on Windows and Maccomputers, as well as with the mobile control app

    • Banner image for: <h2>Flagship Ess 8-channelES9039SPRO*2 DACS</h2>

      Flagship Ess 8-channelES9039SPRO*2 DACS

      Inside the k19 are two of the new ESS 8-channelES9039SPRO DAC chips,

      featuring the fourth generation32Bit HyperStream architecture and capable

      of ultra-highdynamic range with ultra-low noise.

      These DAc chipsallow the

      k19 to output clearer and richer audio with plentyof detail.

    • Banner image for: <h2>8-channel THX AAA 788+<br/>headphone amplifier</h2>

      8-channel THX AAA 788+
      headphone amplifier

      The k19 features a new headphone amplifier designconsisting of

      an 8-channel THX AAA 788+ headphone

      amparchitecture working together in parallel and backed by

      ahigh-voltage power supply. The THX amp chips

      areconnected in parallel via 2x2 groups to make up

      a totallybalanced,4-channel amplification system.

      The result isenhanced transients, and high-poweroutput up to8000mW+8000mW with a

      320 load- allowing the k19 todrive all kinds of headphones with ease.

    • Banner image for: <h2>Dual AcCUSllCON high-performance ultra-</h2><h2>lowphase noise femtosecond crystal oscillators</h2>

      Dual AcCUSllCON high-performance ultra-

      lowphase noise femtosecond crystal oscillators

      The K19 employs two industry-leading ACCUSILICON

      AS318-B ultra-low phasenoise femtosecond crystal oscillators

      (45.1584MHz,49.1520MHz), which are 100%pre-screened

      before being selected for use in the K19.

      These femtosecond crystaloscillators effectively

      reduce the impact of phase noise on audio signals and

      allow foraccurate audio restoration

      and different sampling rates - resulting in purer and

      morestable sound no matter the source sampling rate.

    <h2>High-quality digital audio processing architecture</h2>

    High-quality digital audio processing architecture

    For the frst time in an Fll0 product the K19 utlizes a powerful quad-core FPGA as a high-definition digital signal processing center. TheFPGA is responsible for handling allincoming digital signals,including Bluetooth reception and decoding, USB decoding, coaxial and opticaldecoding, HDMl/ARC decoding, and DSP digital signal processing.

    <h2>Global clock management</h2>

    Global clock management

    Clocks are properly managed ensuring digital signals being handled are low-jitter, making for purer and clearer audio

    <h2>Fully balanced design</h2>

    Fully balanced design

    The K19 processes audio signals through a fully differential chain - from the dual DACs, to the i conversion, to thelow-pass filtering, and finally to the balanced headphone amplifier to ensure high dynamics and minimal crosstalkAlso, various parts of the audio circuits such as the lv, LPf,and preamplifier use multiple precision op-amps includingthe OPA2211 and the OPA1602 to ensure the K19 outputs stable. high-quality sound.

    • Banner image for: <h2>New flagship, ultra-thindie-</h2><h2>cast unibody shock-</h2><h2>proof construction</h2>

      New flagship, ultra-thindie-

      cast unibody shock-

      proof construction

      The k19 comes with a brand new styling, madeof

      a die-cast unibody aluminum alloy body for atotally seamless design.

      The aluminum alloy bodyis carefully polished by a multi-axis CNC

      machineto a quality befitting of a flagship. This aluminumalloy body

      not only features reduced thickness,but is also capably

      shock-proof. And when pairedwith the included stand, the K19 is simply stable!

    • Banner image for: <h2>A new HiFi direction,</h2><h2>supports HDMI/ARC</h2>

      A new HiFi direction,

      supports HDMI/ARC

      HDMl IN and ARC capabilities are present in an FllO desktop

      DACand amp for the first time. The K19 supports decoding

      from HDMlinput, HDMl output and HDMl ARC audio return

      channelfunctionality,opening the doors to a new way of experiencing

      animmersive audiovisual experience.
      HDMl decoding/output:

      supports up to 192kHz/24bit sampling rateHDMI ARC: supports 44.1/48kHz sampling rates

    • Banner image for: <h2>Separated and </h2><h2>shieldedcircuit boards</h2>

      Separated and

      shieldedcircuit boards

      The digital and analog audio circuits of the

      k19 lie onseparate boards

      for full isolation and greatly reducedinterference.

      There are metal shields for the DSP board.

      DAC board, and the THX head-phone amplifier board,

      as aresult of the digital board and module board adopting

      acompartmentalized aluminum alloy isolation design.

      Thesemeasures all help to minimize crosstalk to ensure signalpurity.In addition,

      the honeycomb-mesh aluminum alloybody

      can also help to further reduce external interference.allowing

      you to enjoy pure, clean music.

    <h2>Carefully designed power supply<br/>DC/Ac dual power supply</h2>

    Carefully designed power supply
    DC/Ac dual power supply

    Buit into the Ki9 is a new generaion 40w lower-noise,high-eiciency,long-asting industialgrad power supply. This power suppy supports an ultra-wide range of inputvoltage(85-305VAC) and can operate under extreme temperatures (40"c-85c) wth high relabiity of around 5000 hours. The K19 can also be used wth an extemal Dc powersupply', allowing you to pair it wih a high-performance linear power supply, leting you experence a diferent sound. *Extemal Dc power supply supports 15V.3A

    <h2>Separate analog and digital power supplies</h2>

    Separate analog and digital power supplies

    separate power suoples for the dioital and analo0 audio cicuits efectivelv avoid crosstalk and intererence belween the twocircuits.lt also allows for better power supply isolation.

    • Banner image for: <h2>Audiophile-grade components</h2>

      Audiophile-grade components

    • Banner image for: <h2>Dual internal and externalheat </h2><h2>dissipation, high energycoolly output</h2>

      Dual internal and externalheat

      dissipation, high energycoolly output

      The K19's internal heat dissipation system consists ofthemmally

      conductive material being in contact with the chipsinside, which transfers the heat from the chips t

      o the thermallyconductive material and finally to the aluminum

      alloy outerframe. In addition, the thermally

      conductive aluminum alloybody

      features a honeycomb mesh design, which allows

      forconvection heat dissipation

      The internal and external heatdissipation systems of the k19 allow the

      machine toconsistently output high power without the user worrying aboutheat issues.

    • Banner image for: <h2>Six operating modes</h2>

      Six operating modes

    • Banner image for: <h2>Four analog output +two digital output</h2>

      Four analog output +two digital output

      PO+PRE OUT (default position): front headphone out+rear audio out
      (volume adjustable)
      PO: audio output only from the front headphone jack (volume adjustable)

      PRE OUT: audio output only from the rear connectors (volume adjustable)

      LO: audio output only from the rear connectors (fixed level output)
      COAXlAL: standard RCA connectors, digital output

      OPTlCAL: standard toslink connectors, digital output

    • Banner image for: <h2>Full range of connectors andoperation buttons</h2>

      Full range of connectors andoperation buttons

      1XLR4 balanced headphone out2 6.35mm headphone out
      3 4.4mm balanced headphone out4 Display
      5 USB port 6 Menu knob with button
      7Volume knob with button 8 Bluetooth antenna
      9 HDMIIN10HDMIOUT/ARC 18Optical OUT
      11 12V trigger in12Ground switch
      13 RS232 port14USB port
      15 CoaxialIN16Coaxial OUT

      17Optical IN18Optical OUT

      19 Single-ended line-out20 Balanced line-out
      21 AC/DC power toggle switch22 DC power lN
      23AC power lN24power switch

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

      Parts list

      1----Quick start guide
      2----Warranty card
      3----AC power cord
      4----Type-C to USB-A adapter
      5----6.35mm adapter
      6----stand (color-matching with main unit)
      7----Vertical headphone stand support(color-matching with main unit)
      8----Screwdriver
      9----MetalXLR4 dust cover(pre-installed)
      10----Feet stands
      11----Screws
      12----USB2.0 data cable
      13----DualType-C data cable!
      14----3.5mm audio cable
      15----Infrared Remote Control

    General specifications

    Hardware solution
    DAC: ES9039SPRO*2; USB: XMOS XU316; Bluetooth decoding: QCC5125;AMP: 8-way THX788+
    Working mode
    USB DAC mode/Coaxial decoding mode/Optical decoding mode/HDMI decoding mode/HDMI ARC decoding mode/Bluetooth receiving mode
    Color
    Black/Silver
    Weight
    About 1800g
    Gain
    Ultra high gain/Super high gain/High gain/Medium gain/Low gain
    Drive-free mode (Switch mode)
    Surpported
    Display status indication
    Display indication: volume, gain, output mode, working mode, transmission format, sampling rate, EQ, etc.
    Bluetooth format indicator(Knob indicator light)
    Bule：SBCCyan：AACPurple：aptX/aptX LL
    Balanced line output interface
    XLR3 balanced socket
    HDMI interface
    HDMI IN interface*1; HDMI OUT(ARC) interface*1
    Power parameters
    Power supply
    Support AC 100-240V~50/60Hz; DC 15V/≥3A (choose one of the two)

    Audio parameters

    Some performance parameters of headphone output (6.35mm output, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)
    Output power 1
    L+R≥4000mW+4000mW（16Ω，THD+N＜1%)
    Freq. Response
    Output power 2
    L+R≥2300mW+2300mW（32Ω，THD+N＜1%)
    Frequency response
    20Hz~20kHz: Attenuation <0.2dB20Hz~80kHz: Attenuation＜3dB
    Balanced line output performance parameters (XLR3, USB DAC/Coaxial decoding/Optical decoding)
    THD+N
    ＜0.00025%(1kHz/0dB@10kΩ)
    Frequency response
    20Hz~20kHz: Attenuation <0.1dB20Hz~80kHz: Attenuation＜3dB
    Noise floor
    <2.0μV (A-weighted)
    Line output level
    4.8Vrms  (1kHz@10kΩ)
    1. Quick start guide, DSP download link of K19

    Quick start guide download link

    Click here

    FiiO USB DAC driver download(K19 is not compatible with Win7/8)

    Click here

    K19 Dedicated DSP

    Windows version download: Click here

    MAC version: Click here

    (You could also search and download 'FiiO DSP' from the APP store. )

    FiiO Control App download

    Android version: Click here

    iOS version: You could search and download 'FiiO Control' from the APP store.

    2. What should I do if the K19 is abnormal? And safety instructions

    No sound, noisy sound, no power on

    The following methods can help you troubleshoot the cause:

    1. Check whether the AC/DC toggle switch matches the currently plugged in power supply. Unplug and replug the power cord, and turn on the switch on the back of the K19. It does not support the reset function, so we need to turn the back switch off, and then turn it on again to reboot the K19.

    2.Check whether the usage mode, input and connection are correct.

    3. Replace the input terminal: Switch to other input ports, or change to a mobile phone or computer under USB to locate whether the fault is from the K19 or the front end.

    4. Replace the output terminal: such as earphones, earphone cables, replace them with other outputs such as line output, balanced output, etc. to locate the fault.

    When connecting to the front panel headphone ports, the output selection needs to be switched to [PO] or [PO+PRE]. When connecting to the rear panel output ports, the output selection needs to be switched to [PRE] or [LO] or [PO+PRE].

    5. Software side: There are many reasons for the software side failure, which can be eliminated by the following methods, whether the DAC driver is installed, whether the playback software and the output of the system are correspondingly switched to K19, and whether other sampling rate Flac and DSD tracks can be played

    *If the methods provided above cannot solve the problem, please contact support@fiio.com with the receipt attached.

    【Water entry】

    Turn it off immediately and stop using it. Do not supply power. Keep it in a dry place. Contact our customer service for help.

    3.K19 accessory list, power supply instructions

    How to use the base support and the feet pads?

    When you don't want the K19 to take up too much space on your desktop, you can place the machine on its side and use the standard base for support. When placed on its side, you don't need to put the feet on the bottom. Only when placed on its front, you need to apply the 4 feet pads.

    K19 working power supply instructions

    The voltage range of DC power supply is 10V~16V, we recommend to use 15V 3A or over 3A power supply for power supply. Any voltage below the design range will cause the K19 not working, but theoretically there will not be any damage to the K19. The K19 has internal voltage detection and protection circuitry, any power supply that exceeds the range will be disconnected from the internal circuitry by the system. The plug standard for the DC power cord is 5.5x2.1mm, positive inside and negative outside.

    AC power supply is ultra-wide input voltage, 85V~305VAC are available. The power cord is using the universal AC cord standard.

    What is the 3.5mm audio cable used for?

    The 3.5mm cable is mainly used for Trigger function.

    The following are some of the questions you may encounter when using the Trigger function:

    1.Can I use 3 pins common 3.5mm cables for the Trigger function?

    The Trigger cable comes with the K19 is a 2pins 3.5mm cable, but in fact a 3pins 3.5mm cable can be used. In practice, the L and GND pins are used for positive/negative signals, and the R pin is not connected.

    2.Trigger Design Specifications

    Trigger IN: Nominal 12V trigger, in practice, 5~15V can be triggered, power consumption is below 20mA;

    Trigger OUT: nominal 12V DC output, external output ≤ 60mA, if the trigger current in the terminal device exceeds 60mA , the synchronously power on and off function may not be able to trigger.

    3.Why is the response speed of Trigger synchronously power on and off function a bit slow?

    In order to avoid false triggering and filtering trigger signal jitter phenomenon, the K19's Trigger function has done a certain delay anti-jitter processing to ensure that no false triggering phenomenon will occur. Therefore, there will be a little delay. And in the process of K19 power on or off, the system blocks the Trigger function. You need to wait until the K19 is completely turned on or off before it can respond to the Trigger function again.

    4. K19's Knob/Menu/Remote control setting instruction

    Power on/off/Volume Knob

    Short press the knob to turn off/wake up the screen

    When K19 is off, press the knob to turn it on. Hold the volume knob to turn the K19 off.

    When K19 is on, rotate the volume knob clockwise to turn up the volume, counterclockwise to turn down the volume.

    Menu/Input Knob

    Menu setting: On the homepage, hold the menu knob to call up the settings menu, rotate it to switch between different settings, and short press it for confirmation. On the settings menu, hold the menu knob for about 2s or select and press the "Return icon" to return to the previous page.

    Working mode switching: On the homepage, rotate the menu knob to erter the working mode menu, and keep rotating to successively switch between USB/COAXIAL/OPTICAL/HDMI/HDMI ARC/BLUETOOTH modes. Choosing the targeted mode and short pressing the knob for confirmation, it will switch to the corresponding mode and return to the homepage. On the working mode switching page, hold the menu knob to return to the homepage.

    Menu settings instuction

    Equalizer

    Jazz, Rock, R&B, Hip-Hop, Pop, Dance, Classical and 10 customized equalizers can be selected for a total of 17 equalizer effects.

    With DSP software, you can realize more playability.

    Gain

    Five types of gain can be set: Low, Medium, High, Super High and Ultra High.

    1. Gain switch: Ultra High,Super High,High, Medium and Low corresponding to the gain of 13dB/10dB/0dB/-3dB/-9dB.
    2. Gain is invalid under PRE or LO output.
    3. When using L/M gain, THX power supply is 12V; when using SH or UH gain, THX power supply is switched to 14.5V through software.

    Output selection

    (√ means the current level has output while × means no output).

    LO: the output is switched to the rear panel; volume is not adjustable and no output from front panel headphone ports.

    PRE: the output is switched to the rear panel; volume is adjustable and no output from front panel headphone ports.

    PO: the output is switched to the front panel; volume is adjustable and no output from the rear panel ports. When connecting the headphones to K19, please select PO.

    PO+PRE：the output ports in the front and rear panels have output at the same time; the volume is adjustable.

    Max volume

    Self-defined from 20 to 120 levels (can not be customized to volume 0 in order to prevent misuse , leading to users thinking that the machine is malfunctioning.)

    Filter

    K19 has original 7 filters of the DAC chip. You could choose the filter according to your listening preferences.

    Dimmer

    Adjustable brightness 1~5 levels

    Screen timeout

    When the screen is inactive for the set time, the display will turn off automatically. Adjustable 15 seconds to 30 minutes.

    Rotate screen

    You can customize the screen flip angle. There are default, 90 °, 180 °, 270 ° four angles can be selected.

    Smart idle time

    When K19 is not in working condition (e.g. stop playing) and reaches the set time, the background will turn off part of the circuit power supply to minimize heat generation and save power. When resuming the working state (e.g. replaying), K19 automatically enters the working state and resumes output. Three time values of 2min/10min/30min can be selected. When OFF is selected, it means that the intelligent power saving is not enabled and the K19 will continue to be in the normal working decoding state.

    U-AUDIO

    Support UAC1.0 and 2.0 modes. UAC 1.0 is driverless mode: supports PS5, Switch and other drive-free devices;UAC2.0: high bit-rate transmission mode

    Language/语言

    switch between Chinese and English

    Factory Reset

    The K19 can be restored to factory settings, resetting all parameters, including customized EQ parameters and Bluetooth pairing record that have been saved in the K19. The cache information will be cleared without downgrading the firmware version.

    Version

    Check MCU, DSP, FPGA firmware version.

    Bluetooth version could be checked via FiiO Control APP; XMOS firmware version could be checked via Window USB DAC driver panel.

    Update

    Enter MCU firmware upgrade mode

     

    5. K19's signal input and output method description

    Input Supported by K19

    K19 supports USB, optical, coaxial, HDMI,HDMI ARC and Bluetooth input, a total of 6 input modes. The input modes can be switched via the menu knob, infrared remote control or FiiO Control APP.

    Input priority

    1. USB input: USB port in front panel > USB port in rear panel

    2. The other input modes can be switched via the menu knob, infrared remote control or FiiO Control APP.

    Output supported by K19

    K19 supports 6.35mm single-ended output, 4.4 balanced output, XLR4 balanced output, RCA line output (LINE OUT), balanced line output (BALANCED OUT), coaxial out, optical out, HDMI out, a total of 8 output methods.

    Output priority

    1. [PO]Front panel output: 4.4mm, 6.35mm and XLR4 balanced output, with the same priority, can output at the same time, but it is not recommended to use it for a long time at the same time, especially when the impedance of the two earphones is quite different. The output volume may be too loud and can cause the low-impedance headphones in it to overload and cause damage.

    2. [LO] or [PRE] rear panel output: LINEOUT and BALANCE OUT can be output at the same time.

    3.[PO+PRE] the output ports in the front and rear panels have output at the same time; the volume is adjustable.

    4.Coaxial and optical outputs with no control switch are always in the output state. The volume of optical/coaxial output is not adjustable. You can adjust the volume of the decoder device connected to the out port.

    Which headphone port on the front panel has the best sound quality?

    Theoretically, the XLR4 balanced port is not much different from the 4.4 balanced port. And the balanced output port sounds more balanced and has more power than the 6.35mm port.

    Different headphone ports with different headphones will have a different taste. The sound quality is not good or bad absolute distinction. It is recommended to try and compare by yourself.

    The relevant recommendations for connecting speaker:

    1.Generally, when connecting to the amplifier or active speakers, please adjust the volume of the amplifier or active speakers to low level before connecting. Gradually adjust to suitable level after connecting to avoid popping sound.

    2. In LO mode, the output volume is max and can not be adjusted . please adjust the volume of the amplifier or active speakers to low level before connecting. Gradually adjust to suitable level after connecting to avoid popping sound.

    3. When connecting to speakers with no volume adjustment, it is recommended to use PRE mode in K19.

    6. The sample rate supported by K19

    USB in: Up to 768kHz/32bit, DSD512 (Native) , MQA 8X

    Coaxial in: Up to192kHz/24bit, DOP64, MQA not supported

    COAX out: Up to 384kHz/24bit; DSD128 (DOP) ，MQA

    OPT in:Up to 96kHz/24bit

    OPT out: Up to 192kHz/24bit

    HDMI in: Up to 192kHz/24bit

    HDMI ARC: Up to 48kHz/16bit

    7. K19 indicator light description

    K19 adopts RGB indicator light. When the power is turned on, the indicator light is on.

    In the playback state of digital signal input (including USB, OPT, COAX,HDMI, HDMI ARC), it can indicate the current audio quality:

    1. Cyan ≤ 48khz sampling rate (K19 does not support songs with a sampling rate lower than 44.1kHz)

    2. Yellow>48khz sampling rate

    3. Green DSD format

    4.Magenta MQA

    RGB indicator color in Bluetooth mode

    Bluetooth codec/status

    SBC

    AAC

    aptx/aptx LL

    LDAC

    aptx-adaptive

    aptx-HD

    Connected but no codec recognized

    Pairing mode

    Color

    Blue

    Cyan

    Purple

    White

    Green

    Yellow

    Blue

    Alternate red and

    blue

    Can the indicator lights of the two knobs be controlled independently to display different states?

    No, these two knob indicators are kept in the same state and designed for synchronized control. So the indicators can only display the same state but not be separated from the independent control display.

    8.DSP Equalizer Introduction

    All working modes of the K19 support DSP equalizer, which can be adjusted through the connected computer or mobile phone.

    When using the DSP equalizer on a computer, please use a USB cable to connect tthe K19 through its RS232 port to the computer, and download the DSP equalizer software first.

    (Windows version download: Click here MAC version: Click here You could also search and download 'FiiO DSP' from the APP store. ). When using the DSP equalizer on a mobile phone, please download the FIIO Control app to use it.

    When K19 switches EQ on and off, the sound is interrupted for about 1 second?

    K19's EQ is a hardware implementation. When switch on or off the EQ, the system will initialize, turn off the power and switch the audio path for the DSP chip.In order to avoid the sound like the impact sound which affects the experience, so the mute treatment has been done. The EQ of the player is realized by software algorithm with no hardware involved, so there will be no sound interruption when switching.

    Can the EQ parameter files exported by Windows DSP and MAC OS DSP be shared?

    Yes, the EQ parameter file exported from both systems can be cross recognized and used. You can also share it with other users.

    DSP EQ is available in which output?

    All working modes of the K19 support DSP equalizer for analog outputs, such as PO, BAL, RCA_LO, BAL_LO.

    The DSP EQ is not available for digital outputs, such as COAX and OPT outputs .

    Since the EQ function of K19 is realized by the dedicated DSP chip, the EQ is not available for digital output signals (coaxial/optical output) which do not pass through the DSP chip is not available.

    9. How to control K19 on FiiO Control?

    Download the latest FiiO Control App on your phone: download link

    After connecting K19 to your mobile phone via Bluetooth, open FiiO Control APP, find FiiO K19 in My Products page and click Connect. After a successful connection, you will enter the Bluetooth control page of K19.

    What to do if the phone cannot be connected:

    1.Try to restart K19 and connect again

    2.It is not recommended to use FiiO Control and FiiO Music at the same time. During Bluetooth high bit rate transmission, if you set FiiO Control, there may be conflicts. It is recommended to use FiiO Music to play music after the setting is completed.

    3.Please turn on the location of the mobile phone, turn off the FiiO Control APP, and reconnect it

    4. It is recommended to set K19 to Bluetooth working mode first. Open FiiO Control to connect K19 after the mobile phone searches for FiiO K19 device in "Settings - Bluetooth" and connects to it successfully.

    10.How to use the K19 as a USB DAC for mobile phones?

    The K19 does not have a battery, and is powered by an external power supply. You can purchase an OTG adapter cable to connect to an Android phone, an Apple phone or a player.

    Android phone

    1. K19 input setting: Switches to USB working mode using menu knob

    2. K19 output setting: switch to the corresponding output port according to the interface used, switch to [PO] or[PO+PRE]for the front panel, switch to[PO+PRE], [PRE] or [LO] for the rear panel.

    3. Connect the mobile phone and K19 through the type-C to type-C cable comes with K19 or other OTG cable to use.

    [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, it needs to be turned on, and some devices have to turn off the USB output to have sound.

    2. Confirm whether the mobile phone developer mode has enabled USB debugging. On the mobile phone, you need to turn on USB debugging, turn on "Developer Options", and then turn on the "USB debugging" or "OTG" function.

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

    4. 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 it is not possible to connect to the computer, consider repairing or replacing the machine.

    iPhone/iPad

    It is necessary to purchase a Lightning to Type C data cable with OTG function (such as LT-LT1) to connect K19 and iPhone/iPad/iPod(You could use the type-C to type-C cable comes with the K19 if you are using iPhone 15 or above device.), and enjoy high-quality music by playing songs.

    [Note]

    When the iOS device is decoding, adjusting the volume of the iOS device is invalid.

    Does K19 support driverless function?

    Yes. In the system setting menu of the K19, you could switch U-AUDIO option to UAC 1.0. PS5, Switch and other drive-free devices can be supported.

    11. How to use K19 as a USB DAC for computer?

    Windows computer

    1. Install the FiiO USB DAC driver on the computer: Click

    Notice:

    a. This version of the driver can only be used in Win10 and Win11 systems. Win7 and Win8 are not applicable.

    b. If you have already installed other versions of the driver, please disconnect all FiiO devices from the computer when installing the driver (otherwise it may cause a file missing prompt after the version is installed).

    2. K19 input setting: Switches to USB working mode using menu knob

    3. K19 output setting: switch to the corresponding output port according to the interface used, switch to [PO] or[PO+PRE]for the front panel, switch to[PO+PRE], [PRE] or [LO] for the rear panel.

    4. Connect the computer and K19 through a square USB data cable, set the audio output of the computer system and the audio output of the playback software to K19 and then use it.

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

     

    MAC computer

    MAC computers do not need to install drivers, just select and set the corresponding sound output device.

    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

     

    Linux computer

    The Linux system is driver-free. In theory, it can be used directly by connecting it. However, due to the large number of versions, there is no guarantee that all systems can be adapted. If it is connected, it is recommended to use other data cables or USB ports to check. If it is not recognized, it should be is not supported.

     

    Does K19 support driverless function?

    Yes. In the system setting menu of the K19, you could switch U-AUDIO option to UAC 1.0. PS5, Switch and other drive-free devices can be supported.

     

    Why can’t K9 be recognized and used (USB) on win7 or win8 system computers?

    The provider that provides us with USB DAC driver solutions has made it clear that it is no longer compatible with win7 and win8 systems in 2021, and only retains support for win10 and win11 systems.

    In order to solve the problem of errors when users mistakenly use XMOS firmware to upgrade, we have decided after research to use a separate PID for each model of subsequent new products as a basis for upgrade judgment. It turns out that FiiO's old models share the same PID. K19 uses a new PID, which cannot be recognized by versions 5.50 and below. It needs to be updated to version 5.50 or above.

    Therefore, driver version 5.58 and above must be installed to use K19, and K19 is not compatible with win7 and win8 systems.

    12. How to upgrade the firmware for K19?

    K19 can be upgraded with firmware, of which, both XMOS and MCU firmware need to be upgraded via PC; Bluetooth firmware can be upgraded via FiiO Control APP. Firmware is not available at the moment, and will be added after subsequent updates.

     

    MCU firmware update instruction: 

    Video instruction about updating the K19: https://youtu.be/q-5kwBWNJ4E 

     

    Before updating MCU firmware for K19, please note the following:

    1) You can use a Windows computer or MAC computer.

    2) In addition to connecting the K19 to the computer, it is recommended to unplug all other devices or decoders on the computer USB interface;

    3) During the firmware upgrade process, please do not disconnect the power supply or unplug the USB cable to avoid upgrade failure.

    1. First switch the working mode of K19 to USB mode, then long press the MENU/INPUT button to enter the menu, find "Update" in the menu, select "on", and the screen of K19 will display "Waiting... .", and then connect the USB interface on the front panel of the K19 to the USB interface on the computer.

    Please note:

    a) Use the USB interface on the front panel of K19 instead of the USB interface on the rear panel of K19;

    b) If it is a desktop computer, please use the USB interface on the front panel of the desktop computer and do not use the USB interface on the rear panel;

    c) Please do not use a USB 3.0 data cable, otherwise the computer may not be able to recognize the K19. The USB 3.0 data cable is different from the USB 2.0 data cable. The inside of the USB 3.0 data cable interface is usually blue; please use a USB 2.0 data cable. It is recommended Use the USB cable that comes with the K19 from the factory.

    2. Check the computer at this time. A blank USB drive letter will appear on the computer with a memory size of approximately 1.69MB. Copy the “update.bin” file (please do not modify this file name) in the "K19_MCU_M146" folder to this blank USB drive letter. The copying time is about 20 seconds. When the file copy is completed, you can right-click the USB drive letter and select "Eject".

    Note: Do not unplug the USB cable directly, and do not click the eject button in the lower right corner of the computer, otherwise the K19 will not enter the upgrade state.

    3. At this time, K19 will automatically enter the firmware upgrade state, and the words "Updating..." will be displayed on the screen. During the process of upgrading the firmware, please keep the K19 powered normally, do not operate the K19, and do not turn off the power. The upgrade process will last about 30 seconds. After the upgrade is completed, K19 will automatically restart. After that, you can see MCU M146 in the "Version" in the K19 menu, which indicates that the K19 MCU M146 firmware upgrade is successful.

    13. How to use the K19 as Bluetooth receiver?

    How to use Bluetooth function?

    1. After power on, switches to Bluetooth working mode using menu knob

    2. Open the Bluetooth settings on the mobile phone, find K19 and click

    3. Select the corresponding headphone port output: switch to the corresponding output port according to the interface used, switch to [PO] or[PO+PRE]for the front panel, switch to[PO+PRE], [PRE] or [LO] for the rear panel.

    Note: After turning it on, the Bluetooth control function of K19 can be used at any time. As long as it is turned on, K19 can be set through software without switching to BT mode.

    Clear pairing

    If you have already connected to other Bluetooth devices, you can do a factory reset through the setting menu to force K19 enter pairing mode and connect with a new device.

    If you don't want to factory reset the K19, you can choose to clear the K19 from pairing individually through the FiiO Control APP menu after connecting the mobile phone to the K19.

    No response after Bluetooth connection

    1. Restart K19

    2. Clear the pairing of K19

    3. Delete the K19 from the Bluetooth settings on the mobile phone and pair it again

    4. Do a factory reset through the setting menu to force K19 enter pairing mode and connect with a new device.

    14.How to use K19 optical, coaxial function?

    1. The use of coaxial and optical input is similar. After powering up, switches to optical/coaxial working mode using menu knob.

    2. Input setting: connect the coaxial or optical fiber cable to the corresponding input port.

    3. Output setting: select the corresponding headphone port output: switch to the corresponding output port according to the interface used, switch to [PO] or[PO+PRE]for the front panel, switch to[PO+PRE], [PRE] or [LO] for the rear panel.

    [Note]

    FiiO player uses coaxial output, pays attention to use the coaxial adapter cable delivered with the player, changes PO output to SPDIF, and changes SPDIF to D2P.

    15. How to use the HDMl IN and HDMI ARC mode in K19?

    How to use the HDMI IN mode?

    The HDMI IN mode of the K19 supports audio and video signal reception, as well as transmitting the received video signals to the monitor.

    1. Switch to HDMI mode using menu knob.

    2. Connect the audio device with HDMI output to the HDMI IN port of the K19, and then connect the HDMI OUT port of the K19 to the monitor to cast the display of the audio device to the monitor, and the sound will be decoded and output on the K19 (e.g., connect the computer to the HDMI IN of the K19, and then connect the K19’s HDMI OUT to the monitor).

    3. When connecting the K19 to an audio device, such as a computer, you need to select the corresponding sound card device in the audio settings on the computer.

    How to use the HDMI ARC mode?

    1. Connect an audio device with ARC function to the HDMI OUT (ARC) port of the K19.

    2.Switch the input mode of K19 to HDMI ARC mode using menu knob.

    3. On the ARC audio device side, Settings - Sound Settings - Output Options,confirm that the current output has been switched to HDMI (ARC) output mode

    4. After playing the audio/video in ARC audio device, if the K19 has no output, you can check the K19 HDMI ARC interface, the sample rate showing in the display. Generally, the output sampling rate is 48kHz for ARC out.

    5.If there is no sound when the sampling rate is confirmed to be 48kHz, please try to adjust the ARC volume from the audio source device side.

    16.K19 DSP function instruction

    When connecting the computer to the K19 via a USB cable, be sure to connect the USB port marked RS232 on the rear panel of the K19. Other USB ports do not support connection with the DSP.

     

    The overall functional division of the DSP client is shown in the figure above:

    a) DRC/DRE，compressor and Limited adjustment area

    b) DSP online status

    c) Settings

    d) 31-band EQ parameter setting area

    e) EQ switching and access operation area

    f) EQ curve display area

    If after opening the DSP client, it prompts that the connection failed, you can check whether the USB cable between K19 and the computer has been correctly connected, and whether it is connected to the RS232 USB port on K19. After confirming that the connection is correct, you can close the prompt window and click the "Connect" knob in the upper right corner to reconnect.

    You can also check whether there is a device named "USB-Enhanced-SERIAL CH343" in the computer's device manager after connecting to the computer. If not, it means that the K19 is not correctly connected to the computer and you need to recheck the hardware connection status.

    If you need to switch the language, you can click the menu knob as shown above, select "Language/语言", and switch the 中文 or English display as needed.

     

    1. DRC/DRE，compressor and Limited adjustment area

    The parameters in this area are divided into 3 parts, from top to bottom, namely dynamic adjustment, compression adjustment and limiter adjustment. The small circle in the upper left corner of each section is the reset button. When you need to reset parameters, click this button to restore the parameters to default.

    1.1 Dynamic Adjustment

    The main function of this part is to improve or reduce the dynamic performance of the track.

    DRCDRE THR: Dynamically adjust the start level. When the detected signal size reaches the set threshold (usually less than the set value), the function will take effect.

    DRCDRE Attack: When the signal duration meets the start level setting threshold, the function takes effect.

    DRCDRE Release: The signal does not meet the start level setting threshold, and when the duration reaches this set value, the function fails.

    DRCDRE Ratio: Dynamically adjust the parameter proportion. The larger the value, the greater the adjustment range.

    DRCDRE Depth: Dynamically adjust the size setting. When this parameter is a negative value, it will reduce the dynamic performance of the track (a simple understanding is to reduce the output amplitude); when this parameter is a positive value, it will improve the dynamic performance of the track (a simple understanding) That is to increase the output amplitude).

    1.2 Compression adjustment

    The main function of this part is to limit the maximum output amplitude as a whole and perform overall attenuation based on the current maximum signal to avoid sound breakage and distortion caused by excessive amplitude.

    Comp THR: function enable trigger threshold.

    Comp Attack: When the signal duration meets the start level setting threshold, the function takes effect.

    Comp Release: The signal does not meet the start level setting threshold, and when the duration reaches this set value, the function fails.

    Comp Ratio: After triggering the compression limiting function, the compression amplitude is set. The larger the value, the greater the reduction.

    1.3 Limiter adjustment

    The main function of this part is to limit the maximum output amplitude as a whole to avoid sound breakage and distortion caused by excessive amplitude.

    Limiter THR: function enable trigger threshold.

    Limiter Attack: When the signal duration meets the start level setting threshold, the function takes effect.

    Limiter Release: The signal does not meet the start level setting threshold, and when the duration reaches this set value, the function fails.

    1.4 The difference between compression adjustment and limiting adjustment

    From a functional point of view, compression adjustment and limiting adjustment are both used to limit the maximum output amplitude of the signal, but they are slightly different: compression adjustment is an overall limitation. For example, in the range of 20Hz~20kHz, it is detected that the current 1kHz has been triggered. By setting the compression threshold, the output signal will reduce the overall amplitude of all signals in the full frequency range of 20Hz to 20kHz, which is equivalent to reducing the overall volume of the K19. Under the same conditions, if only 1kHz reaches the limiting adjustment threshold, the output signal will only limit the output amplitude of 1kHz, and other frequency bands will remain unchanged, maintaining the original output size.

     

    2. EQ parameter setting instructions

    This area is the main parameter section for EQ adjustment. There are a total of 31 levels of EQ parameters available for adjustment. You can change the parameters through interface buttons, push buttons, arrows, etc. to adjust the parameter configuration that meets your own requirements. Each section can set the PEQ type, gain value, frequency value, and Q value parameters.

     

    2.1 PEQ type

    PEQ is mainly divided into 3 types:

    Type 1: PEQ - Peak EQ. In this mode, frequency point adjustment will only affect the frequency amplitude at the current frequency point and its sides, as shown in the figure above.

    Type 2: LSEQ - Low Shelf EQ. In this mode, setting parameters will have an overall impact on the frequency below the current frequency point, as shown in the figure above.

    Type 3: HSEQ - High Shelf EQ. In this mode, the set parameters will have an overall impact on the part above the current frequency point, as shown in the figure above.

    2.2 Gain

    This item is to adjust the output amplitude. A positive number means prompting the output amplitude, a negative number means reducing the output amplitude. The maximum can be set to +12dB and the minimum -24dB.

    2.3 Frequency

    This item is used to set the frequency value that needs to be adjusted.

    2.4 Q value

    The Q value is used to define the width of the frequency range affected by boosting. It describes the frequency range of boosting or attenuation, which is actually bandwidth. The larger the Q value, the smaller the bandwidth affected, and conversely, the smaller the Q value, the larger the bandwidth affected.

    3. EQ switching and access operation instructions

    3.1 EQ switch

    Click the first button in the picture to pop up the EQ selection list, select any required EQ name, and K19 can switch to the corresponding EQ simultaneously (note, if you switch EQ from K19 while the DSP is connected, the DSP client will The current EQ displayed will not be refreshed, just disconnect and reconnect the DSP software). It is recommended that when the DSP client is connected, use the DSP to switch EQ first.

    3.2 EQ import, export and save

    When you click "EQ Export", you can save the current EQ setting parameters in the computer to form a local parameter file; click "EQ Import" again, you can import the EQ parameter file to the DSP client, and K19 will immediately follow the parameter settings. effective execution.

    When the DSP client is online, if EQ is imported or modified, K19 will immediately take effect simultaneously. However, the modified data will not be stored in memory. When you need to save the parameters to K19, you can use the "EQ Save" button to save the parameters to In Custom 1~Custom 10, the original custom parameters are overwritten.

    3.3 EQ Reset and Bypass

    EQ reset: Reset the current EQ parameters and restore them to factory settings (Note: After resetting the EQ, the K19 will not automatically save it. You still need to manually select the save EQ to save the parameters to the K19).

    EQ Bypass: Click this button to temporarily turn off the EQ function. Click it again to restore the EQ function. It is especially suitable for AB comparison listening of EQ on and off states.

    3.4 RTA function

    RTA is a function used to display real-time spectrum measurement and analysis of audio. K19 does not support it and you can ignore this function.

    4. Description of EQ curve display area

    This area can display the overall output status of the actual EQ curve. When you use the mouse to drag the digital dots in the area, you can quickly adjust the EQ parameters.

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