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FiiO K7 – Balanced Desktop DAC & Headphone Amplifier (THX AAA 788+)

FiiO K7 – Balanced Desktop DAC & Headphone Amplifier (THX AAA 788+)

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FiiO K7 Desktop Balanced DAC & Headphone Amplifier True balanced Hi-Fi, within reach. The FiiO K7 has redefined the entry-level... Read more

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    Description

    FiiO K7 Desktop Balanced DAC & Headphone Amplifier

    True balanced Hi-Fi, within reach. The FiiO K7 has redefined the entry-level desktop audio market. By incorporating the same six-stage truly balanced audio circuit found in FiiO's high-end K9 Pro, the K7 delivers a level of clarity, power, and soundstage depth that was previously impossible at this price point. It is the perfect upgrade for gamers, music lovers, and budding audiophiles.

    Flagship Technology, Compact Design

    Dual AK4493S "Velvet Sound" DACs

    At the heart of the K7 are two AKM AK4493S DAC chips, handling the left and right channels independently. This rich, musical chipset delivers FiiO’s signature "Velvet Sound"—smooth, detailed, and free of harshness, making it perfect for long listening sessions.

    Dual THX AAA 788+ Amplifiers

    Power is nothing without control. The K7 utilizes dual THX AAA 788+ amplification modules. This legendary technology provides an incredibly low noise floor and ultra-low distortion while pumping out a massive 2000mW of power (at 32Ω). Whether you use sensitive IEMs or high-impedance studio headphones like the HD600, the K7 drives them with authority.

    Precision Control and Versatility

    RGB Status Indicator

    The iconic large volume knob features a ring of RGB light that intuitively displays the sampling rate of the currently playing music:

    • Blue: 44.1kHz - 48kHz

    • Yellow: 88.2kHz and above

    • Green: DSD

    ADC Volume Control

    Say goodbye to channel imbalance at low volumes. The K7 employs ADC volume curve reconstruction, ensuring that the left and right channels are perfectly matched even when you are listening at whisper-quiet levels with sensitive earphones.

    Technical Specifications

    Feature Detailed Specification
    DAC Chipset Dual AKM AK4493S
    Amp Technology Dual THX AAA 788+
    Architecture Truly Balanced Six-Stage Circuit
    Output Power ≥2000mW (32Ω Balanced) / ≥1220mW (32Ω SE)
    Outputs 6.35mm Single-Ended / 4.4mm Balanced
    Inputs USB, Optical, Coaxial, RCA Line-In
    SNR ≥120dB (A-weighted)
    Dimensions 120 x 168 x 55 mm
    Weight Approx. 610g

    Why Choose the FiiO K7?

    • Input Switching: Easily switch between USB, Optical, Coaxial, and Line-in sources with a dedicated toggle switch on the front panel.

    • Three Output Modes: Features a toggle for Line Out (LO), Pre-Out (PRE), and Headphone Out (PO), allowing you to use the K7 as a pure DAC or a preamp for your speakers.

    • Clean Power: Powered by an external 12V switching power supply, engineered with internal LDOs to ensure a clean, low-noise electrical signal.

    • Sleek Aluminum Build: The CNC-machined aluminum alloy body is robust, elegant, and fits perfectly on any desk.

    Frequently Asked Questions

    What is the difference between K7 and K5 Pro ESS?

    The K7 is a significant upgrade. It features a truly balanced architecture (Dual DACs + Dual Amps) and a 4.4mm balanced output, whereas the K5 Pro is single-ended. The K7 offers better channel separation, lower noise, and more refined sound.

    Can I connect active speakers to the K7?

    Yes. You can connect powered speakers to the RCA outputs on the back. By switching to "PRE" mode, you can control the speaker volume using the K7's knob.

    Does it support PS5?

    Yes, the FiiO K7 supports UAC 1.0 mode (via a specific setup procedure), making it compatible with gaming consoles like the PS5 for high-fidelity gaming audio.

    • Add Streaming to your K7: Connect a WiiM Pro via Optical to turn your K7 into a high-res wireless streaming system
    • Unleash the full potential: The K7's THX power is perfectly matched for the FiiO FT3 high-impedance headphones.

    Specifications

    • Weight: 200gr
    • Usage: Indoor & outdoor

    Pros and cons

    • Sustainably produced
    • Ideal for everyday use
    • May discolor in direct sunlight
    • Banner image for: <h2>K7/K7 BT</h2><h2>A new baseline for balanced</h2><h2>desktop sound</h2>

      K7/K7 BT

      A new baseline for balanced

      desktop sound

      Truly balanced DAC/Amp |THX AAA 788+ amp technology | Dual AK4493SEQ DACs

      Multiple intelligent protection systems Two levels of hardware gain | QCc5124 Bluetooth

      chip included 12V/24W low-noise switching power supply Power supply with numerous

      independent LDOs RGB status indicators |3 output modes

    • Banner image for:
    • Banner image for: <h2>Truly balanced decoding and amplification</h2>

      Truly balanced decoding and amplification

      The K7 has a six-stage audio circuit with truly balanced analog and digital sections - which helps to reduce
      crosstalk and reproduce music to a great extent, allowing you to better enjoy the purity of your music.

    • Banner image for: <h2>Democratized high-quality balanced amplification<br/>Couldn/yt,sound better</h2>

      Democratized high-quality balanced amplification
      Couldn/yt,sound better

      Using the same THX AAA 788+ amplifiers as the K9 Pro, the K7 is capable of outputting 560mW into a 300Ω load at 1% distortion, andd2000mW into a 320 load at 1% distortion. This ensures both low and, are powered with aplomb, and most importantly lets you experience musicality that''s sure to tug at your heartstrings

    • Banner image for: <h2>Dual AK4493SEO<br/>Rich and delicate overall sound</h2>

      Dual AK4493SEO
      Rich and delicate overall sound

      The left and right channels are each equipped with an efficient high-performance AK4493sEQ. With this DAc’s
      pleasant timbre, its rich and delicate overall sound will let you rediscover your music all over again.

    • Banner image for: <h2>Robust decoding capabilities<br/>Take a trip around the music world</h2>

      Robust decoding capabilities
      Take a trip around the music world

      The XMOS XUF208 decoder chip uses dual clock management to

      handle various music formats with ease, allowing you to easily

      listen to many audio formats.

    • Banner image for: <h2>RGB indicator lights<br/>For a colorful</h2>

      RGB indicator lights
      For a colorful

      The RGB indicator lights are capable of displaying single colors as well as mixed colors, with a unique light flow effect

      during power-on/off or input switching. Dazzling and vivid light effects give your desk some much needed spice.

    • Banner image for: <h2>HD Bluetooth A reassuring wireless experience</h2>

      HD Bluetooth A reassuring wireless experience

      The Bluetooth version of the k7 is available. lt uses the Qcc5124 Bluetooth chip*, supporting high-definition Bluetooth formats likeLDAC/aptX HD/aptX Adaptive. When using the K7 BT, switch the input mode to Bluietooth, and you will acquire low-latency Bluetoothtransmission and hi-res sound quality. Also, the app control* helps to further enhance your wireless experience.

      *Bluetooth 5.1, supports LDAC/aptX Adaptive/aptX/aptX HD/aptX LL/AAC/SBC

      *Through the FiiO Control app, the K7 BT can achieve the following,Through the FiiO Control app, the K7 BT can achieve the following

    • Banner image for: <h2>Multiple intelligent protection systems<br/>WVorpyfree listening</h2>

      Multiple intelligent protection systems
      WVorpyfree listening

      Overheating, overload, DC protection systems ensure that the k7 always operates at its bestso you can always enjoy a wonderful listening experience in multiple scenarios.

    • Banner image for: <h2>Consistent inside and out<br/>For pure clean listening</h2>

      Consistent inside and out
      For pure clean listening

      The K7 features a power design consisting of multipl

      eindependent stages, with a voltage of each stage being

      regulated by low-noise LDOs. Feeding this power design is a

      nexternal 12V switching power supply, All in all, the k7's power

      design is designed to supply plentiful, clean power for an

      extraordinary listening experience.

    • Numerous exciting possibilitiesAll within reach

      Numerous exciting possibilitiesAll within reach

      Variety of inputs and outputs All in one place

    • One key controls switching between

      One key controls switching between

      One key controls switching between the 4 different inputs,with a flowing light effect to indicate when the input hasswitched and is ready.

    • 3 different outputsWith just one touch

      3 different outputsWith just one touch

      One touch of a handy key allows you to switchbetween 3 output modes (for use withheadphones, with speakers, or use as a DAC)

    • Banner image for: <h2>Precisely tuned volume<br/>For truly moving experience</h2>

      Precisely tuned volume
      For truly moving experience

      Thanks to ADC curve reconstruction, experience a smooth 112 steps of adjustable volume free

      of channel imbalances and noise - ensuring that every note is faithfully reproduced.

    • Banner image for: <h2>Lightweight all-in-oneSimple and elegant</h2>

      Lightweight all-in-oneSimple and elegant

      The K7 features a petite design that only measures 55mm thick

      and with a footprint of less than 1/3 of an A4-sized sheet of

      paper-allowing it to fit perfectly on modern desks.

    • Banner image for: <h2>Abundant Accessories</h2>

      Abundant Accessories

      Power cable x1
      Power adapter x1
      USB cable x1
      Quick start guide x1

      Warranty card x1

    • Banner image for: <h2>Basic Specifications</h2>

      Basic Specifications

      • DAC: AK4493SEQ*2
        Decoder: XMOS XUF 208
        Amplifier: Dual THX AAA 788+
      • Outputs: 6.35mm/4.4mm
      • Inputs: USB/OPT/COAX/RCA
      • Output power 1: ≥2000mW (320, balanced/THD+N<1%)
      • Output power 2: ≥1220mW (320, single-ended/THD+N<
        1%
        Signal-to-noise ratio: =120dB ( A-weighted, UAC)
      • Noise floor: Po <4.4μV (A-weighted, UAC); BAL < 7.7μV (Aweighted, UAc)
        Output impedance: <10 (320 load)
        Weight: About 610g
        Dimensions: About 120mmx168mmx55mm

    General specifications

    Name / Model No. 
    K7/K7 BT
    Color 
    Black
    Weight
    ≈610g
    Gain
    L/H
    Maximum supported sampling rate
    PCM 384kHz-32bit/DSD256（USB DAC）PCM 192kHz-24bit（COAX）PCM 96KHz-24bit（OPT）

    FAQ

    1. Quick start guide, Windows USB DAC driver download link of K7

    Quick start guide download link: Click hereFiiO USB DAC driver download:v4.47.0 version: Click here (For Win7/8)v5.30.0 version: Click here (For Win 10/11, not for Win7/8/XP)

    2. What accessories does the K7 include?

    Power cable x1;Power adapter x1;USB cable x1;Headphone jack adapter x1;Quick start guide x1;Warranty card x1

    3. Signal input, output method and gain description for K7

    [Input supported by K7]K7 supports USB input, optical input, coaxial input, line input, a total of 4 input methods. Click the front panel INPUT button to switch the input mode.[Output supported by K7]K7 supports 6.35mm single-ended headphone output, 4.4 balanced headphone output, RCA line output (LINE OUT), a total of 3 output methods.[Output selection]Switch LO, PRE, PO three output modesLO: rear panel line-out, fixed volumePRE : rear panel line-out, adjustable volumePO: front panel headphone out, adjustable volume[Gain]Switch H/L gainsH/L corresponds to high/low two-gear gain, and the corresponding gain is 0dB/6dB.Choose the gain setting with your earphones such that a comfortable listening volume lies somewhere between 9 and 3 o'clock on the volume knob

    4. How to use the K7 as a USB DAC for mobile phones?

    K7 does not have a battery, it is powered by a built-in linear power supply, you can purchase an OTG cable to connect to an Android phone, an iPhone or a player.【Android phone】K7 input setting: K7 [INPUT] switch to USB gearK7 output setting: switch to the corresponding output port according to the interface used, switch to [PO] on the front panel headphone out, switch to [PRE] or [LO] on the rear panel line-out.Connect the phone and K7 via USB C to USB B data cable (such as FiiO LD-TC1)[Note] If there is no sound after you connect, you need to pay attention to the following points: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;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;Confirm that the adapter cable supports the OTG function, and whether the direction of the cable is reversed;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 USB B data cable which supports OTG function(e.g. FiiO LD-LT1) to connect K7 and iPhone/iPad/iPod, and you can enjoy high-quality music by playing songs.【Note】Only support Apple devices with iOS10.0.2 and above. Those with lower versions cannot be supported because of the Apple system's reasons.When the iOS device is decoding, adjusting the volume of the iOS device is invalid

    Collapsible row

    [Windows Computer]Install the FiiO USB DAC driver on your computer first:Click hereK7 input setting: switch K7 [INPUT] to USBK7 output setting: switch to the corresponding output port according to the interface used, switch to [PO] on the front panel headphone out, switch to [PRE] or [LO] on the rear panel line-out.Connect the computer and K7 through USB data cable, set the audio output of the computer system and the audio output of the playback software to K7How to play music in DSD format when used with a computer:Click here[MAC Computer]MAC computer does not need to install the driver, just choose to set the corresponding sound output device.【Note】It is recommended to adjust the system volume to the maximum, and adjust the output volume of the machine by adjusting the potentiometer.When K7 is connected to Mac, it supports up to DSD128 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 K7 supports up to 384kHz ).In theory, OSX can also connect to K7 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.

    6. How to use the coaxial and optical decoding function of K7?

    (1) After powering on the K7, short press the input button and switch the input mode to OPT. The K7 will enter optical decoding mode.(Switch to Coaxial to enter the coaxial decoding mode).Use an optical or a coaxial cable to connect the input device to the K7 to achieve optical or coaxial decoding.(2) Switch the output mode to a suitable one.LO: rear panel line-out, fixed volumePRE : rear panel line-out, adjustable volumePO: front panel headphone out, adjustable volume(3) Scroll the volume knob and adjust the volume of the K7 to a suitable level before playing music.(4)Play music on the front device to enjoy the music.Note: When there is no output from the K7, please try to play other music first.

    7. How to use the line input function of K7?

    (1) After powering on the K7, short press the input button and switch the input mode to LINE. The K7 will enter line in mode.

    (2)Switch the output mode to PO and connect the headphone to the K7.(3) Scroll the volume knob and adjust the volume of the K7 to a suitable level before playing music.(4)Play music on the front device to enjoy the music

    8. The sample rate supported by K7

    The highest sample rate supportedUSB: 384kHz/32bit, DSD256Coaxial: 192kHz/24bitOptical: up to 96kHz/24bitThe reason for only support up to 384kHz/DSD256 in USB mode:During developing the K7, we found that there will be noise when decoding some DSD512 and 768k music files. We did try to fix this problem via different methods but failed still. Currently, the amount of DSD512 and 768k files are still limited. So we did not add the DSD512 and 768k support in the K7 finally.

    10. Is it normal that the K7 is heating?

    The THX AAA 788+ module, which has better output power and sound effect, also bring the same heating problem for K7 as the K9Pro. In addition, the K7 heat dissipation is relatively slow since the K7 uses closed enclosures. After a long time of use, the shell will be warmer and this is normal.And there is an overheating protection system in the K7. When the internal temperature exceeds the set value, the protection system will be triggered. Therefore, you don't need to worry about the heating in the K7.

    11. Overheating protection,Overload protection and DC protection of K7

    The protection system will be triggered when the K7 is overloaded or overheating.When the protection system is triggered, you would need to restart the K7 for help: you can restart the K7 via the volume knob or replug the power plug.DC protection is to prevent problems with the K7 damage to the headphones. If it keeps triggering, the K7 may have hardware issue. Please contact the seller or support@fiio.com about that.

    12. How to update the XMOS firmware for K7?

    Please do not update this firmware if you are not planning to turn off the RGB light for your K7. 

    Before Upgrade

    1. Ensure that you have installed the USB DAC driver(Download link: Click here)

    2. Download the K7 system firmware upgrade package.

    Upgrade operation

    Double click to run the firmware upgrade tool: FiiODfu.exe (included in the compressed package)

    1 , After powering on the K7, please click the input button and switch the input mode to the USB DAC mode. And then connect the K7 to the computer through the USB port.

    2 , Click " Browse " → select the upgrade package file, then click "Open".

    3 , Click " Start " to start the upgrade.

    4 , After the progress bar has completed, when the interface displays Firmware “upgrade finished successfully”, it represents the firmware upgrading has been successful. 

    Note: Please do not perform any operation until the upgrade is completed.

    Please do not update other XMOS firmware for the K7.

    Please do not connect other DAC like BTA30Pro to the computer at the same time when updating the firmware for the K7.

    13. What power adapter is suitable for the K7?

    The AC power input of the power adapter comes with K7 supports AC power between 100V and 240V.The specification of the DC port for K7 is 5.5x2.1mm.The DC output of the power adapter comes with K7 is 12V/2A. You could use 12V3A power supply as well. It is recommended to use the power adapter comes with the K7 or FiiO linear power supply PL50.

    14. What's the main difference between K7 and K5Pro?
    1. 1. The K7 follows the convenient interaction in the K9 series. Press the button to switch input signals, switch gain level by the 2-level switch to take good care of headphones with different impedance and sensitivity; switch outputs between DAC, PRE and HP outputs by the 3-level switch. Besides, the K7 supports 4.4 balanced output.
    2. 2. In terms of headphone amplifier, the K7 uses dual THX AAA 788+ amps which has the best overall performance in the current market. It can produce an undistorted 560mW under a 300Ω load (THD+N＜1%), and an undistorted 2000mW under a 32Ω load (THD+N＜1%).
    3. 3. The K7 first uses RGB indicator lights that are capable of displaying single colors as well as mixed colors, with a unique light flow effect during power-on/off or input switching. Dazzling and vivid light effects give your desk some much needed spice.
    15. Does the K7 work as amplifier when using line out during line in mode?

    No, the K7 only works as a signal converter at that time. The input signal will barely go though the main circuit of the K7 and the K7 will not work as amplifier.

    16. Can I turn off the RGB indicator or change its colour?

    You could not change its colour.

    But if you would like to turn off the RGB indicator of K7, you could install this XMOS firmware for your K7 in the Windows computer.

    17. Can I connect the amplifier with balanced input to the 4.4mm headphone output port of the K7?

    Yes,the 4.4mm balanced headphone out(with 4 audio pins and a ground pin) of the K7 could drive the amp well actually though it is not lineout port. You could order the suitable cable for connecting the 4.4mm port of K7 and the balanced input port of the amp.

    18. Does the K7 support Bluetooth?

    The K7 does not support Bluetooth.Before developing the K7, we did some questionnaire and found that most K5Pro users need the balanced output but not Bluetooth.After taking into account the cost and cost performance, we decided not to add Bluetooth for K7 first. Without Bluetooth, the cost could be reduced and the final price could be kept at a lower level.In fact, we also have a professional Bluetooth transceiver BTA30Pro. If you would need the Bluetooth connection, you could consider the BTA30Pro+K7 for help.Of course, if the user's needs change later, we will also consider adding the Bluetooth function for K7.

    19. Does the K7 support DSD decoding in coaxial mode?

    The coaxial mode supports up to 192k so DSD decoding is not supported.

    20. What to try if the K7 could not be recognized or the output is stuttering, when using as USB DAC for computer?

    Some USB ports in the front panel of the computer may not provide stable power supply. Please try the USB ports in the back panel or use other usb cables.

    21. Why will the response slow when switching input mode?

    In order to prevent large changes in volume when switching the input mode, we designed a "fade out" function, i.e. the volume will gradually increase when switching, so that it needs more time for reaction. That's why it will be slow.

    There is no response when switching too fast, because it is still in the switching cycle. In this case, please wait a few seconds.

    22. Why will there be latency when adjusting volume through the volume knob?

    It seems that the volume is controlled through the volume knob. But in fact, when adjusting the volume, the internal MCU will detect the rotation of the knob. Therefore, it will go through a process: rotate the knob-> MCU detection and anti-shaking processing-> conversion into a value-> send volume adjustment instructions to the electronic volume chip-> change the sound.

    This process runs very fast, but we need to ensure stability at any rotation angle, and we need to add anti-shaking and error correction measures. If the rotation is too fast, it will cause multiple judgments, which is to prevent abnormal volume changes that damage hearing.

    In addition, the 8-bit single-chip microcomputer used in the K7 may not be as fast as the K9 Pro in real-time processing, such as when detecting the change of the input signal, whether the output is overloaded, and the position of the potentiometer. Therefore, it is normal that the volume adjustment is not as smooth as the K9 Pro.

    23. With the same THX AAA-788+ amp chip, why would the maximum output power of the K7 be 2W, and the K9 Pro be 3W?

    Theoretically, using the same THX AAA-788+ as the K9 Pro, the K7 will have an output power of up to 3W. When designing the K9 Pro and K7, we considered that the usage scenarios of desktop devices are more strict. For example, some users prefer to use them to connect to passive speakers and headphones which require a lot of power and output at the same time. Since the Q7/M17 and other products were designed with output detection, they can detect the output status in a timely manner. While the K7 and K9 Pro always have output, we designed them with limited maximum output power. Therefore, it will remain stable even when switching the interface. But don't worry, 2W stable output power is enough for most headphones.

    24. The OPT and COAX indicator is flashing at the same time. Why does this issue happen?

    Are you using connecting to the 4.4mm port when the issue happens?

    Please check whether the definition of the adapter/cable of your headphone is same to the K7's 4.4mm port? Is your headphone the balanced headphone or the unbalanced headphone instead?

    4.4 mm port:

    The definition of most unbalanced 3.5mm port:

    The balance output port has four output pins: L+, L-, R+ and R-. ("L" = "left channel" "R" = "right channel" "+" = "positive" "-" = "negative")

    However, the 3.5mm standard output port has only three pins: L, R and GND.

    Therefore, the 3.5 mm unbalanced output plug can not be converted into 2.5/4.4mm balanced output plug actually.

    Connecting the unbalanced plug to balanced jack may damage your device as in this case, the positive and negative terminals will contact and cause short circuit. If your adapter is for the 3.5 mm unbalanced output plug to 2.5/4.4mm balanced output plug, it is not suitable for the 4.4mm balanced port of the K7.

    When using that adapter, the overload protection in K7 will be activated when the volume is in higher level in order to prevent the K7 for damaging.

    25. When the volume knob is between the OFF and 9 o'clock positions, the K7 will have no output. Is it normal?

    If the volume knob is between the OFF and 9 o'clock positions, the K7 will have no output. This is a normal feature of the analog potentiometer, since it is designed with a certain space in the initial and final sections, which is reserved to accommodate errors. The system will debug and monitor the reserved space, so it will not affect normal uses.

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