Introducció
The FiiO K9 is a high-performance desktop headphone amplifier and DAC designed to deliver exceptional audio quality. It integrates advanced components and versatile connectivity options to enhance your listening experience. This manual provides detailed instructions for setting up, operating, and maintaining your FiiO K9.
Característiques clau
- High-performance ES9068AS*2 DAC: Features two ES9068AS DACs, one for each channel, ensuring high-fidelity audio conversion.
- THX AAA 788+ Ampmés viu: Equipped with a THX AAA 788+ amplifier, providing up to 780mW at 300Ω and 2000mW at 32Ω with low distortion.
- Isolated Digital and Analog Power Supply: Separate power supplies for digital and analog sections minimize interference for pure sound reproduction.
- QCC5124 Bluetooth Chip: Supports Bluetooth 5.1 with LDAC, aptX HD, aptX Adaptive, aptX, aptX LL, AAC, and SBC codecs for high-resolution wireless audio.
- Professional PEQ via FiiO Control App: Customize your sound with 7 preset music tuning styles accessible through the FiiO Control app.
Producte acabatview
The FiiO K9 features a robust desktop design with clearly labeled controls and input/output ports. Familiarize yourself with the device's layout before proceeding with setup.

Image: Front and rear panels of the FiiO K9 Desktop Headphone Amplifier, showing all controls and connection ports.

Imatge: Anglesa view of the FiiO K9, highlighting its compact desktop form factor and antenna.
Controls del panell frontal:
- Pom de volum: Adjusts the output volume. Features an RGB indicator for status.
- Selector d'entrada: Cycles through USB, Optical, Coaxial, Line, and Bluetooth inputs.
- Output Selector: Switches between Line Out (LO), Pre Out (PO), and Headphone Out (HP).
- Interruptor de guany: Selects low, medium, or high gain for headphone output.
- Sortides d'auriculars: 6.35mm single-ended, 4.4mm balanced, and 4-pin XLR balanced.
Connexions del panell posterior:
- Entrada d'alimentació de CA: Standard IEC AC cable socket with voltage selector (100-120V / 220-240V).
- Entrada USB: USB Type-B port for connecting to a computer.
- Entrades digitals: Optical and Coaxial.
- Entrades analògiques: RCA Line In and 4.4mm Balanced In.
- Sortides analògiques: RCA Line Out and XLR Balanced Out.
- Antena Bluetooth: Per a la connectivitat sense fil.
Configuració
- Desembalatge: Carefully remove all components from the packaging. Ensure the following items are present: FiiO K9 unit, AC power cable, USB Type-A to Type-B cable, 6.35mm headphone adapter, rubber feet, and quick start guide.
- Voltage Selecció: Before connecting the power cable, verify that the voltage selector switch on the rear panel is set correctly for your region (100-120V or 220-240V).
- Col·locació: Place the FiiO K9 on a stable, flat surface. Attach the included rubber feet to the bottom of the unit to prevent scratching and ensure stability. A vertical stand is also provided for vertical mounting if preferred.
- Connexió d'alimentació: Connect the AC power cable to the K9's rear panel and then to a power outlet.
- Connexió d'entrada:
- USB: Connect the USB Type-A to Type-B cable from your computer to the K9's USB input.
- Òptic/Coaxial: Connect your digital audio source (e.g., CD player, TV) to the corresponding Optical or Coaxial input.
- Line In (RCA/4.4mm Balanced): Connect analog audio sources to the RCA or 4.4mm balanced inputs. Note that the balanced input takes priority over the unbalanced RCA inputs.
- Connexió de sortida:
- Auriculars: Plug your headphones into the desired front panel output (6.35mm, 4.4mm balanced, or 4-pin XLR balanced). Use the 6.35mm adapter if necessary.
- Line Out (RCA/XLR): Connect the RCA or XLR balanced outputs to a power amplifier or active speakers if using the K9 as a preampmés viu.
Instruccions de funcionament
Encès/apagat:
Press the power button on the rear panel to turn the unit on or off. The volume knob's RGB light will illuminate upon power-on.
Selecció d'entrada:
Use the "INPUT" button on the front panel to cycle through available input sources: USB, Optical, Coaxial, Line, and Bluetooth. The selected input will be indicated by an LED.
Selecció de sortida:
Use the "OUTPUT" button on the front panel to select the desired output mode: LO (Line Out), PO (Pre Out), or HP (Headphone Out). The corresponding LED will light up.
Control de volum:
Rotate the large knob on the front panel to adjust the volume. Adjust gradually to avoid sudden loud sounds.
Ajust de guany:
Use the "GAIN" switch on the front panel to select between Low (L), Medium (M), and High (H) gain settings. Choose a gain level appropriate for your headphones' impedance and sensitivity.
Emparellament Bluetooth:
- Select Bluetooth as the input source using the "INPUT" button.
- On your mobile device, search for Bluetooth devices and select "FiiO K9".
- Once paired, the Bluetooth indicator LED on the K9 will remain steady.
Aplicació de control FiiO:
Download the FiiO Control app from your device's app store. This app allows for advanced control and customization, including switching between 7 preset music tuning styles (Professional PEQ).
Especificacions
| Característica | Detall |
|---|---|
| DAC | ES9068AS*2 |
| Xip de descodificació | XMOS XUF 208 |
| Ampmés viu | Doble THX AAA 788+ |
| Xip Bluetooth | QCC5124, Bluetooth 5.1 |
| Compatibilitat amb formats Bluetooth | LDAC/aptX Adaptive/aptX HD/aptX LL/AAC/SBC |
| Sortides | 6.35mm/4.4mm/XLR-4/RCA/XLR |
| Entrades | USB/OPT/COAX/RCA/4.4mm |
| Output Power 1 (32Ω balanced) | L+R≥2000mW+2000mW (THD+N < 1%) |
| Output Power 2 (300Ω balanced) | L+R≥780mW+780mW (THD+N < 1%) |
| SNR | ≥124dB (A-weighted, UAC) |
| Noise Floor (PO) | < 4.8μV (A-weighted, UAC) |
| Noise Floor (BAL) | < 9.3μV (A-weighted, UAC) |
| Impedància de sortida | < 1Ω (32Ω load) |
| Pes | About 2660g (5.86 pounds) |
| Dimensions (excluding feet) | 200x224.5x72 mm (7.87 x 8.84 x 2.83 polzades) |
| Material | Metall, plàstic |
| Color | Negre |

Image: A detailed table listing the technical specifications of the FiiO K9 ampmés viu.
Manteniment
- Neteja: Use a soft, dry cloth to clean the exterior of the FiiO K9. Avoid using liquid cleaners or solvents, as they may damage the finish or internal components.
- Ventilació: Ensure the unit has adequate ventilation. Do not block the ventilation slots on the sides or top of the device.
- Emmagatzematge: Quan no l'utilitzeu durant períodes prolongats, guardeu el K9 en un lloc fresc i sec, allunyat de la llum solar directa i de temperatures extremes.
- Gestió de cables: Mantingueu els cables organitzats i lliures de doblecs o tensions excessives per evitar danys als cables o ports.
Resolució de problemes
| Problema | Possible solució |
|---|---|
| Sense poder | Check if the power cable is securely connected. Verify the voltage selector switch on the rear panel is set correctly for your region. Try a different power outlet. |
| No hi ha so dels auriculars | Ensure headphones are properly plugged in. Check the "OUTPUT" selector is set to HP. Adjust the volume knob. Verify the correct input source is selected. Test with different headphones. |
| No sound from line outputs | Ensure the "OUTPUT" selector is set to LO or PO. Check connections to your amplifier/active speakers. Verify the correct input source is selected. |
| Problemes de connexió Bluetooth | Ensure Bluetooth input is selected on the K9. Put your device in pairing mode. Clear previous Bluetooth pairings on both devices and try again. Ensure devices are within the 10-meter range. |
| Distorted or low-quality sound | Check cable connections for looseness or damage. Ensure the gain setting is appropriate for your headphones (too high can cause distortion, too low can lack dynamics). Verify the source audio quality. |
Vídeo oficial del producte
Vídeo: Presentació oficial del producte en vídeoasing the FiiO K9 Desktop Headphone Amplifier, its features, and connectivity options. This video provides a visual guide to the product's design and functionality.
Garantia i Suport
For warranty information and technical support, please refer to the documentation included with your product or visit the official FiiO weblloc web. Conserveu el comprovant de compra per a reclamacions de garantia.
Optional protection plans are available for purchase separately, offering extended coverage beyond the standard manufacturer's warranty. Please check with your retailer for details on available plans.





