FiiO K9 Pro – Flagship Desktop DAC & Headphone Amplifier with THX-AAA 788+

FiiO K9 Pro – Flagship Desktop DAC & Headphone Amplifier with THX-AAA 788+

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K9 PROFLAGSHIP DESKTOP DAC AND AMPLIFIERCollector's AK4499 chip  THX AAA 788+ Tech Dual femtosecond clocksQualcomm QCc5124|Supports LDAC/aptX Adaptive/aptX HD App... Read more

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    Description

    K9 PRO
    FLAGSHIP DESKTOP DAC AND AMPLIFIER
    Collector's AK4499 chip  THX AAA 788+ Tech Dual femtosecond clocksQualcomm QCc5124|Supports LDAC/aptX Adaptive/aptX HD App controlTruly balanced design Dual voltage linear transformer | Wide connector selection.

    The Fii0 K9 Pro is a flagship-tier desktopDAC/Amplifier designed to be the ultimateall-in-one audio solution for thediscerning audiophile. lt represents a nocompromise approach,integrating top-ofthe-line components from the digitalsource to the analog output to achievereference-level sound quality. The K9 Prois built to serve as the central hub for bothhigh-end headphone listening and a sophisticated speaker system.
    Key Features & Description
    1.Reference-Grade Dual-DAC Architecture.

    The core of the K9 Pro features a dualAK4499EQ DAC configuration, utilizingtwo of AKM's (Asahi Kasei Microdevices) flagship DAC chips in afully discrete, dual-mono design. Thismeans one dedicated DAC chip for theeft channel and one for the right.

    Specifications

    • Weight: 200gr
    • Usage: Indoor & outdoor

    Pros and cons

    • Sustainably produced
    • Ideal for everyday use
    • May discolor in direct sunlight
    • Banner image for: <h1>K9 PRO<br/>FLAGSHIP DESKTOP DAC AND AMPLIFIER</h1>

      K9 PRO
      FLAGSHIP DESKTOP DAC AND AMPLIFIER

      Collector's AK4499 chip |THX AAA 788+ Tech |Dual femtosecond clocks

      Qualcomm Qcc5124|Supports LDAC/aptX Adaptive/aptX HD |App control

      Truly balanced design | Dual voltage linear transformer Wide connector selection

    • Banner image for: <h1>Something you wil!</h1><h1>want to keep</h1>

      Something you wil!

      want to keep

      The K9 Pro, conceived as a flagship from the very beginning. is

      designed to be uncompromising as both an amp and a DAC. lts

      outstanding performance will ensure you want to leave a spot

      for the K9 Pro in your collection of audio gear.

    • Banner image for: <h1>The stfergth to aways<br/>triumphr LegendaryAk4499</h1>

      The stfergth to aways
      triumphr LegendaryAk4499

      The K9 Pro is equipped with the legendary AKM AK4499, renowned in the

      audio industry for its exceptional performance and unparalleled decoding

      capabilities, supporting up to 384 kHz and native DSD256 audio. And given

      its current scarcity, it is definitely a chip many are eager to experience.

    • Banner image for: <h1>Listen to true beauty<br/>ThX AAA amplifier technology</h1>

      Listen to true beauty
      ThX AAA amplifier technology

      The THX AAA 788+ module used in the K9 Pro provide exemplary details

      and dynamics no matter if you are using low or high-impedance

      headphones. The K9 Pro can output up to 46Vpp transients when driving

      high-impedance loads, and up to an undistorted 2W* when pushing

      low-impedance loads. Compared to the original, the output power of the

      K9 Pro has increased by more than 50% with higher heat dissipation
      efficiency.
      *As tested in FiiO Labs under balanced out

    <h1>Six-stage audio circuit that holds<br/>up to scrutiny</h1>

    Six-stage audio circuit that holds
    up to scrutiny

    Every audio signal goes through a mammoth 6-stage circuit to reproduce music as faithfully as possible with every
    last detail.
    V conversion, LPf filter, volume control, buffer amplifier, pre-amplification, output-amplification

    <h1>Precise Design for Highly Demanding Needs<br/>. Fully differential, truly balanced design</h1>

    Precise Design for Highly Demanding Needs
    . Fully differential, truly balanced design

    Fully differential signals go through the four-channel DAc, four-channel volume adjustment, and four-channel amp

    for a truly balanced design. Such a design ensures minimal interference between different components in order to

    fully maintain all details and large dynamic swings in music for unmatched sound quality

    <h1>Clearly partitioned for smooth<br/>signal transmission</h1>

    Clearly partitioned for smooth
    signal transmission

    The PCB of the K9 Pro uses a partitioned layout, wherein

    not only the power supply and signals are separated, but

    the analog signal loop is also put in an independent

    section, guaranteeing the integrity of the audio signal

    being processed

    • Banner image for: <h2>Dualfemtosecond<br/>clocks of excellence</h2>

      Dualfemtosecond
      clocks of excellence

      The newest generation of XMOs chips supports dual-mode clock

      management technology. Under USB and Bluetooth decoding dual

      asynchronous femtosecond clocks are used, while under optical and

      coaxial decoding automatic PLL clocks are employed. A more precise

      clock management system makes it easier to handle any kind of source

      and maintain the maximum quality possible.

    • Banner image for: <h1>Lossless MoA decoding</h1>

      Lossless MoA decoding

      The K9 Pro supports MOA Renderer, allowing you to listen to high

      resolution audio files that are not only reasonably sized, but also

      retain master-level sound quality that brings you directly into the

      recording studio.

    • Banner image for: <h1>Fast and reliable</h1><h1>hi-res Bluetooth</h1>

      Fast and reliable

      hi-res Bluetooth

      The K9 Pro employs the Qualcomm QCc5124 to handle Bluetooth

      duties, with support for formats such as LDAC, aptX HD and aptX

      Adaptive. This chip ensures that Bluetooth connections are both

      reliable and quick, satisfying both the low latency needs for

      games/videos and the high bitrate necessary for high resolution
      audio.

      Bluetooth format support: AAC/SBC/aptX/aptXLL/aptX
      HD/LDAC/aptX Adaptive

    • Banner image for: <h1>Essentiality of<br/>volume adjustment</h1>

      Essentiality of
      volume adjustment

      Adjusting the volume may look like a simple concept, but a good

      execution of it is crucial to an excellent audio experience. The ADC curve

      reconstruction method of volume adjustment used in the K9 Pro

      effectively minimizes any left-right channel volume imbalance and noise.

      It also results in a smooth change of volume across all levels. This

      attention paid to the simple process of volume adjustment is just another

      layer to making sure you truly savor your music with the k9 Pro.


      Micbueis and objscts miy dighuy colee difmnet, pleast in kind prma?

    • Banner image for: <h1>Headphones come alive<br/>with a good source</h1>

      Headphones come alive
      with a good source

      Switch between high, medium, and low gain to fit exactly your

      needs when listening to your particular pair of headphones.

      Thanks to the pure hardware gain circuit, even when listening at

      low gain with high-sensitivity headphones both dynamic range

      and musical fidelity remain uncompromised.

    • Banner image for: <h1>Perfection exemplified</h1>

      Perfection exemplified

      The simple, yet elegant all-aluminum black exterior is anodized

      and finely sandblasted with painstaking craftsmanship for a

      textured, luxurious feel. Controls are cleary and intuitively laid out

      to make operating the device as smooth as possible. Rest assured,

      the K9 Pro is the very definition of a reliable and loyal music

      partner in your home.

    • Banner image for: <h1>Lighting up the mood</h1>

      Lighting up the mood

      The stainless-steel volume knob blends seamlessly with the

      aluminum alloy front panel to give a luxurious experience

      while controlling your music. The RGB indicator lights

      surrounding the volume knob can light up differently

      depending on the currently playing sampling rate.

    • Banner image for: <h1>App-controllable<br/>desktop amp</h1>

      App-controllable
      desktop amp

      Built-in Bluetooth Low Energy (BLE) technology allows you to use

      the FiiO Control App to control functions like channel balance,

      sleep timer, etc. at any time, even when not in Bluetooth mode.

    Specifications-General specifications

    Name / Model No.
    K9 Pro
    Gain
    L/M/H
    FiiO Control
    Supported
    Firmware upgrade
    System firmware and Bluetooth version can be upgraded via USB
    Low battery reminder
    /
    Bluetooth transmission
    /
    Bluetooth format indicator
    SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green
    Maximum supported sampling rate
    384kHz-32bit/DSD256（USB DAC）/ 192kHz-24bit (coaxial) / 96KHz-24bit (optical)
    Hardware solution
    DAC: AK4499, USB: XMOS XUF208, Bluetooth: QCC5124, LPF: OPA1612 * 2,volume IC: NJU72315 * 2, AMP: THX AAA788+ * 2, linear transformer
    Volume Scrollr
    Potentiometer+ADC Sampling
    Channel balance
    L12~R12 (0.5dB per level)
    Deep standby
    Long press the multi-function button for about 3s
    Dimensions
    ≈200×224.5×76mm
    Bluetooth receiver (5.0)
    AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive
    Charging indicator
    /
    Button
    Physical key + toggle switch
    Single-ended line input interface
    RCA socket
    Balanced output interface
    4.4mm socket, XLR4 balanced socket
    Balanced line output interface
    XLR3 balanced socket
    USB
    Type-C, USB B (data transmission)
    Balanced line input interface
    4.4mm balanced socket
    Digital coaxial input interface
    RCA socket
    Headphone output interface
    Standard 6.35 mm socket
    Single-ended line output interface
    RCA socket

    Specifications-Audio parameters

    Single-ended line out putperformance parameters:
    THD+N
    ＜0.0007%(1kHz/10kΩ/dbA)
    Crosstalk
    ≥110dB (1kHz/10kΩ)
    Frequency response
    20Hz~20kHz (-3dB)
    SNR
    ≥123dB (dbA)
    Noise floor
    ＜1.9μV（dbA）
    Line Level
    2.5Vrms (1kHz/10kΩ)
    Balanced line output performance parameters:
    THD+N
    ＜0.0004%(1kHz/10kΩ/dbA)
    Crosstalk
    ≥123dB (1kHz/10kΩ)
    Frequency response
    20Hz~20kHz (-3dB)
    SNR
    ≥123dB (dbA)
    Line Level
    5Vrms (1kHz/10kΩ)
    Single-ended headphone output performance parameters（6.35mm）:
    Continuous undistorted output power 1
    ≥1.1W（16Ω / THD+N＜1%， AUX IN)
    Continuous undistorted output power 2
    ≥2W（32Ω /THD+N＜1%，AUX IN)
    Continuous undistorted output power 3
    ≥278mW（300Ω / THD+N＜1%，AUX IN)
    Noise floor
    ＜2μV（dbA）
    Frequency response
    20 Hz~20kHz (-3dB)
    Output impedance
    ＜1Ω（32Ω）
    Crosstalk
    ≥75dB (1 kHz/32Ω，AUX IN)
    THD+N
    ＜0.0005% (1 kHz/32Ω/dbA)
    SNR
    ≥123dB (dbA)
    MAX Output Voltage
    ＞26Vp-p
    Balanced headphone output performance parameters（4.4mm/XLR4）:
    Continuous undistorted output power 1
    ≥1.1W（16Ω / THD+N＜1%，AUX IN)
    Continuous undistorted output power 2
    ≥2W（32Ω /THD+N＜1%，AUX IN)
    Continuous undistorted output power 3
    ≥1.1W（300Ω / THD+N＜1%，AUX IN)
    Noise floor
    ＜3μV（dbA）
    Frequency response
    5Hz~50kHz (-3dB)
    Output impedance
    ＜1Ω（32Ω）
    Crosstalk
    ≥114dB (1 kHz，AUX IN)
    THD+N
    ＜0.0004% (1 kHz/32Ω/dbA)
    SNR
    ≥123dB (dbA)
    MAX Output Voltage
    ＞51Vp-p

    FAQ

    1. What should I do if the K9 Pro is abnormal? And safety instructions

    【Could not be turned on】

    1. Unplug and replug the power cord to make sure the power cord has connected to the K9Pro firmly.   and
    2. Turn on the switch on the back of the K9 Pro. If the issue still remains, please try to hold the input button for about 10s.
    3. Try to replace the fuse. Remember to check whether the voltage switch is in the correct option before powering on the K9Pro again.

    [No sound, noisy sound]
    The following methods can help you troubleshoot the cause:

    1. Please confirm whether the volume wheel indicator light is on, whether it is in silent mode, short press the power/multi-function button
    2. K9 Pro does not have a reset button, you can restart K9 Pro by switching the rocker switch on the rear panel
    3. Replace the input terminal: When connecting with earphones from the front panel, [OUTPUT] needs to be switched to [HP]. Switch to other input ports, or change to a mobile phone or computer under USB to locate whether the fault is from the K9 Pro 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

    5. Replace the fuse: The fuse is used to cut off the power supply when there is a short circuit or voltage mismatch, which protects the K9 Pro
    6. 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 K9 Pro, and whether other sampling rate Flac and DSD tracks can be played

    If the methods provided above cannot solve the problem, please contact our official customer service "FiiO" manual customer service to give you further detailed answers


    [Inlet]
    Turn it off immediately and stop using it. Do not supply power. Keep it in a dry place. Contact our customer service to register for repair.

    2. K9 Pro's Knob/OUTPUT/GAIN/INPUT/Power Button Description

    【Knob】Rotate the Volume knob to increase the volume. Rotate counterclockwise to decrease the volume. (Note: This is a normal feature that the first few degrees do not influence the volume at all. )

    [OUTPUT]
    Switch DAC, PRE, HP three output modes

    DAC means that the output is switched to the rear panel, and the volume knob cannot adjust the volume. At this time, there is no sound from the earphone port on the front panel.

    PRE means that the output is switched to the rear panel, and the volume knob can adjust the volume. At this time, there is no sound from the headphone port on the front panel.

    HP means that the output is switched to the front panel, and the volume knob can adjust the volume. At this time, there is no sound from the rear panel interface. Please turn to the [HP] file to connect the earphones.


    [GAIN: Gain]
    1. Gain switch: H/M/L corresponds to high/medium/low three-gear gain, and the corresponding gain is -3dB/6dB/16dB
    2. The gain is invalid under Line out and BALANCED OUT output
    3. When the gain is L/M, the THX power supply is 10V, when the gain is H, the THX power supply is switched to 14.5V by software


    [INPUT]
    Switch the 5 modes of K9 Pro signal input: USB, OPT: optical fiber, COAX: coaxial, LINE: line output, BT Bluetooth

    [Power button/Multi-function button]
    Long press to standby, long press for 2 seconds to enter standby mode
    Short press, the indicator light is off, in silent mode, all output ports of K9 pro stop outputting, at this time, the sound can be restored by rotating the volume knob.

    3.K9 Pro's signal input and output method description

    [Input Supported by K9 Pro]
    K9 Pro supports USB input, optical input, coaxial input, line input, Bluetooth input, a total of 5 input methods, through the front panel INPUT button to switch the input

    The highest sample rate supported by each input mode
    USB: 384kHz/32bit, DSD256
    Coaxial: 192kHz/24bit, coaxial does not support DOP
    Optical fiber: up to 96kHz/24bit
    Bluetooth: LDAC protocol supports up to 96k
    Line: analog signal, pure amplification, no decoding


    Input priority
    1. USB input: side USB C port> rear USB B port, when both port B and port C are connected with signal input, K9 Pro will decode the signal from port C first
    2. Line input: 4.4 Line input＞LINE IN


    [K9 Pro output]
    K9 Pro supports 6.35mm single-ended output, 4.4 balanced output, XLR4 balanced output, RCA line output (LINE OUT), balanced line output (BALANCED OUT), a total of 5 output methods

    Output priority
    1. The output is mainly divided into [HP] front panel output and [PRE] rear panel output
    2. [HP] Front panel output: 4.4mm, 6.35mm and XLR4 balanced output, the same priority, can be output at the same time
    3. [PRE] Rear panel output: LINEOUT and BALANCE OUT can be output at the same time

    4. K9 Pro indicator light description

    K9 Pro uses RGB indicator light, the power is turned on, the indicator light is on.

    In the digital signal input (including USB, OPT, COAX) playback state, it can indicate the current audio quality:
    1. Blue ≤48khz sampling rate (K9 Pro does not support songs with a sampling rate lower than 44.1kHz)
    2. Yellow>48khz sampling rate
    3. Green DSD format
    4. Purple MQA tracks

    [Measures to deal with red light abnormality]
    1. When the red light is on, it means that the temperature is higher than 70℃. At this time, K9 Pro will stop working. It is recommended to leave it for a while and try again
    2. When the playback is abnormal, it is recommended to turn off the switch on the back panel and restart K9 Pro
    3. For overload protection, it is recommended to unplug part of the output interface before using K9 Pro

    5. K9 Pro accessories list description

    Packing list:
    1. K9 Pro *1
    2. Power cord*1
    3. Square port USB data cable*1
    4. Bluetooth antenna *1
    5. 6.35mm male to 3.5mm female Headphone jack adapter*1
    6. Quick start*1
    7. Warranty card*1
    8. Instruction card for voltage selection*1
    9. Fuse*1
    10. Voltage protection plug*1

    [Why do you use the fuse?]
    The fuse is used to cut off the power supply when there is a short circuit or voltage mismatch, which protects the K9 Pro
    It can be replaced with other fuses of the same specification, fuse tube specification @T 250V500mA H 5.2x20mm

    [Where should the red voltage level at the bottom be toggled? ]
    The voltage protection plug is plugged to the bottom to prevent dust. There are two voltage ranges of 110V and 220V, which can be adjusted to the corresponding voltage according to the local voltage range.

    6. How to use the K9Pro as a USB DAC for mobile phones?

    K9 Pro does not have a battery, it is powered by a built-in linear power supply, you can purchase an OTG to connect to an Android phone, an iPhone or a player

    [Android phone]
    1. K9 Pro input setting: K9 Pro [INPUT] switch to USB gear
    2. K9 Pro output setting: switch to the corresponding output port according to the interface used, switch to [HP] on the front panel, switch to [PRE] or [DAC] on the rear panel
    3. Connect the phone and K9 Pro via USB data cable (both side and back data ports are available)

    [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 setting that needs to be turned on, some devices only have sound when the USB output is turned off

    2. Confirm that USB debugging is enabled in the developer mode of the mobile phone
    You need to turn on USB debugging on the mobile phone, turn on "Developer Options", and then turn on the "USB debugging" or "OTG" function

    3. Confirm that the adapter 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 uniformly standardized, 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 the computer DAC to exclude whether the hardware of individual devices is faulty (such probability of the situation is small), if it can't be recognized when connect to the computer, you can consider return it to us for repairing or replacing.


    [IPhone/iPad]
    You need to purchase a Lightning to TypeC data cable which supports OTG function(e.g. FiiO LT-LT1) to connect K9 Pro and iPhone/iPad/iPod, and you can enjoy high-quality music by playing songs.

    [Note]
    1. Only support Apple devices with iOS10.0.2 and above. Those with lower versions cannot be supported because of the Apple system's reasons.
    2. When the iOS device is decoding, adjusting the volume of the iOS device is invalid

    7. How to use K9 Pro as a USB DAC function to connect to a computer?

    [Windows Computer]
    1. Install the FiiO USB DAC driver on your computer: https://drive.google.com/file/d/19A8ROt0olaztSm61wsciIFO2uoRkgqIH/view
    2. K9 Pro input setting: switch K9 Pro [INPUT] to USB
    3. K9 Pro output setting: switch to the corresponding output port according to the port used, switch to [HP] for the ports on front panel, switch to [PRE] or [DAC] for the ports on rear panel
    4. Connect the computer and K9 Pro through USB data cable (both side and back data ports are available), set the audio output of the computer system and the audio output of the playback software to K9 Pro.

    How to play music in DSD format when used with a computer? 

    https://forum.fiio.com/note/showNoteContent.do?id=202105281106126083841

    [MAC Computer]
    1. MAC computer does not need to install the driver, just choose to 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.

    [Note]
    1. When K9 Pro is connected to Mac, it supports up to DSD256 to play DSD tracks. This is because under OSX, it can only support DSD128 through DoP (DSD256 needs to be packaged with 768K under MAC, while K9 Pro supports up to 384kHz ).
    2. In theory, OSX can also connect to K9 Pro to play DSD256 through Native, but the corresponding playback software must also pass MFi and support Native output.

    [Linux Computer]
    The Linux system is drive-free. In theory, it can be used directly by connecting it to it. However, due to the large number of versions, it cannot be guaranteed that all systems can be adapted. If the connection is not recognized, it is recommended to change to another data cable or USB port for troubleshooting.

    8. How to control K9 Pro on FiiO Music App or FiiO Contol?

    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

    Ensure that the FiiO Control App is the latest version. Enter the  the App->Tap the FiiO K9Pro to complete the connection. After a  successful connection, it will enter the Bluetooth control menu.


    2. Filter
    EQ is only valid for Bluetooth

    What should I do if other phones are connected?
    It is not recommended to use FiiO Control and FiiO Music at the same time"

    9. How to upgrade the Bluetooth firmware of K9Pro/K9Pro ESS?

    The K9Pro/K9Pro ESS upgrade is completed on our APP FiiO Control (or FiiO Music), and it supports online upgrade and Local upgrade.

     

    Online upgrade:
    1. Connect K9Pro/K9Pro ESS to the phone via Bluetooth
    2. Start the APP and go to the K9Pro/K9Pro ESS Status page- -> Settings-Firmware upgrade

    3. On the firmware upgrade page, tap Online upgrade
    4. The system will automatically detect the new firmware version (beforehand make sure there is network working).Then a prompt dialogue will pop up. Tap CONFIRM to start the upgrade.
    5. When the upgrade is going, please do not make any operation and wait with patience.
    6. When the upgrade completes, a prompt of Upgrade completed successfully will pop up.

     

    Local upgrade:

     

    K9 Pro(AKM)Bluetooth Firmware downlaod link: Click here

    K9 Pro ESS Bluetooth Firmware download link: Click here


    1. Connect K9Pro/K9Pro ESS to the phone via Bluetooth

    2. Start the APP and go to the K9Pro/K9Pro ESS Status page- -> Settings-Firmware upgrade

    3. On the firmware upgrade page, tap Local upgrade

    4. On the file list, tap the search icon and select the firmware file. Then a prompt dialogue will pop up. Tap CONFIRM to start the upgrade.
    5. When the upgrade is going, please do not make any operation and wait with patience.
    6. When the upgrade completes, a prompt of Upgrade completed successfully will pop up.

     

    Note:
    1. Please confirm that FiiO Control is installed on the phone, if not, you can download and install: Click here

    2. Please update the firmware in Bluetooth mode and do not leave the Bluetooth mode until finishing update.

    3. If the firmware update fails, please restart the K9Pro AKM/K9Pro ESS and update again. 

    4. Both Android and Apple devices support upgrades

    10. How to use the K9 Pro as Bluetooth receiver?

    1. After power on, switch [INPUT] to BT mode
    2. Open the Bluetooth settings on the phone, and click after finding K9 Pro
    3. Select the corresponding headphone port output

    [Clear Pairing]
    If you have connected to other Bluetooth devices, you can long press [INPUT] for 5 seconds to force the K9 Pro to pair with the new device.

    After turning on the K9 Pro, the Bluetooth control function of K9 Pro can be used at any time, as long as it is turned on, you can set the K9 Pro through the software without switching to BT mode.
     

    Why is there no response when Bluetooth is connected?
    1. Clear the pairing of K9 Pro
    2. Delete the K9 pro from the Bluetooth settings on the phone and then pair it again
    3. Long press [INPUT] to clear the pairing, and the K9 Pro will re-enter the pairing mode with the red and blue lights flashing

    11. How to use K9 Pro optical, coaxial, and line input?

    1. The use of coaxial and optical fiber is similar. After power on, switch [INPUT] to the corresponding indicator optical fiber (OPT) and coaxial (AX)
    2. Input settings, connect the coaxial or optical fiber cable to the corresponding input port
    3. Output settings, switch to the corresponding output, connect headphones to realize the decoding function of K9 Pro

    [Note]
    The FiiO player uses coaxial output. Please pay attention to use the coaxial adapter cable, change the PO output to SPDIF, and change SPDIF to D2P. 

    12. What is the sound tuning direction of K9 Pro?

    K9PRO mainly considers the needs of headphones, so the sound tuning is based on resolution. Moreover, we do not pursue strong tension to express his driving power.
    Coupled with the blessing of THX, the sound reproduction is relatively high, and the background sound is clean; the soundstage is regular (longitudinal and horizontal are regular)
    In addition, due to the high magnification and strong driving ability, when matching different headphones, please pay attention to matching gain and volume.
    Although they are all headphones, some have high sensitivity, you can use medium gain + large volume for them which will make the sound softer and more delicate.
    If the sensitivity is low, it is recommended to use high gain + loud volume to get sufficient power.

    13. How to play DSD tracks with K9 Pro?

    The method of using Foobar 2000 to play general lossless tracks is very simple, and it can be done in three steps:
    1. After decompressing the folder, install the Foobar 2000 and FiiO DAC driver
    2. Use the data cable to connect the computer and the decoding device: K9 Pro, Q3, BTR5, etc.
    3. Open the playback software Foobar2000 and set the output to: ASIO: FiiO ASIO Driver, some computers will not switch automatically, you need to switch the computer's audio output device to the corresponding decoding device

    Additional settings are required to play DSD
    1. Install the components, install all the plug-ins of the package
    2. Click output, select the output mode ASIO: foo_dsd_asio
    3. Click on SACD decoder, drive mode selection: DSD
    4. This needs to be set according to different decoding devices. DoP Marker 0x05/0xFA is preferred. Some decoders also support ASIO Native"

    14. How to play MQA tracks on K9 Pro?

    K9 Pro supports USB to unfold MQA tracks, K9 Pro is equivalent to MQA Renderer, it needs to be equipped with a front-end mobile phone or player that supports MQA Core. 
    Generally speaking, whether a set of equipment can successfully unfold MQA tracks can be analyzed from the direction of the audio signal.
    Audio signal direction: audio source -> playback software, playback equipment -> connection cable -> K9Pro  
    1. Audio source: the song is MQA coded track 
    2. Playback software: supports MQA playback, if the software does not support it, only ordinary lossless tracks will be played.
    3. Playback device: install software that supports MQA on your mobile phone or buy a player that supports MQA, such as FiiO M11 Plus LTD. 
    4. Adapter cable: When connecting the MQA decoder, the player and the decoder need to be connected with an OTG adapter cable. Both USBs of K9 Pro can be connected to the mobile phone or the player through the OTG adapter cable to unfold MQA 
    5. K9 Pro only supports USB MQA unfold, the panel output button [OUTPUT] pay attention to the corresponding output.

    15. Differences between K9 Pro and K9 Pro ESS

    【Main differences on the electronic part】

    1. Different DAC: the K9 Pro ESS uses dual ES9038PRO (the best flagship DAC in the ESS family), while the K9 Pro uses the best AMK AK4499, which has been discontinued for 2 years due to the fire that happened to AKM.

    2. Slight difference on the internal circuit: due to needs on adjusting the power supply, indicators and sound properties, we have made some slight adjustments on part of the electric circuits (But the key parts are still the same, as excellent as the former ones).

    3. Slight improvements on the output power, distortion and SNR compared to the K9 Pro.

    【Main differences in the structural portion】

    1. Due to larger output power, we have designed heat dissipation holes on both sides to help dissipate more heat. (Placing the K9 Pro ESS horizontally can help to dissipate more heat).

    2. The volume knob was changed to a PVD processed gold one, which looks more attractive.

    3. The internal structure has been improved to dissipate more heat.

    4. Included are the support stand and isolation feet, helping to save more space on the desktop when placed vertically.

    16. What are the sound differences between AKM and ESS verison K9Pro?

    Row content

    17. Why is the K9Pro not using the THX AAA-888?

    The K9 Pro is a product that sells for less than $1,000 and does not require the THX AAA 888 in terms of power and product positioning.

    Whether we will use the THX AAA-888 is still a question due to its relatively large power. See the table below.

    We have also conducted a comprehensive test. However, there is no product that fits it currently. Maybe in the future, there will be. Let's look forward to it. 

    18. Why is the volume knob of the K9 Pro ESS a little bit skew?

    The knob is designed with a potentiometer pole + aluminum alloy knob. The volume is controlled by rotating the large knob to drive the potentiometer.

    Between the potentiometer pole and the aluminum alloy knob is a plastic component, which is convenient for installation and can help to solve the shaking issue. It is an unavoidable issue in the industry. The larger the volume knob, the more obvious the issue.

    In the design, if it is skewed 1° off the original position, one side will shift about 0.39mm, 3° will cause about 1.18mm shift, and 5° about 1.97mm. Because the volume knob of the K9 Pro is large, a 2mm to 3mm shift for one side is normal.

    19. The color of the internal transformer of K9 Pro ESS

    Some users may notice that the internal transformer of the K9 Pro ESS available in China is green while the one in some foreign countries is brown (those requiring the China Compulsory Certification are also green).

    Since there are different certification demands in different countries/regions, the color of corresponding transformers may vary. But they have the same performance and indicators. For example, it needs the China Compulsory Certification for sales within China (while in foreign countries, it normally requires the CE or FCC).

    To facilitate the production, we used different colors for the transformer. It is the same as the K9 Pro. The only difference is that we cannot see the color of the K9 Pro’s transformer from outside.

    20. Why does the K9Pro/K9Pro ESS not support DSD512?

    Max sampling rate support: 32bit/384kHz PCM, native DSD256.

    Just like the K9 Pro, we found during testing that noises would occur when playing DSD512 and above 768k sampling rate. We have attempted many times yet still cannot absolutely settle it. Since we have strict quality controls and there are not many DSD512 and 768k sampling rate songs on the market, we decided to leave DSD512 and 768k sampling rate behind.

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