1. Introducció
This manual provides detailed instructions for the proper use, setup, and maintenance of your FiiO K9Pro ESS High Resolution Desktop DAC and Amplifier. Please read this manual thoroughly before operating the device to ensure optimal performance and longevity.

Figure 1.1: FiiO K9Pro ESS Desktop DAC and Ampvidador, espectacleasing its compact design and various input/output ports.
2. Precaucions de seguretat
To prevent fire, electric shock, or product damage, observe the following safety guidelines:
- No exposeu el dispositiu a la pluja o la humitat.
- No desmunteu ni modifiqueu el dispositiu. Encarregueu tot el manteniment a personal qualificat.
- Assegureu-vos una ventilació adequada al voltant de la unitat per evitar el sobreescalfament.
- Utilitzeu només l'adaptador d'alimentació subministrat amb el dispositiu.
- Eviteu col·locar el dispositiu a prop de fonts de calor o sota la llum solar directa.
3. Contingut del paquet
Verifiqueu que tots els elements siguin presents al paquet:
- FiiO K9Pro ESS Unit
- Cable d'alimentació
- USB Type-B to Type-C Cable
- Antena Bluetooth
- Guia d'inici ràpid
- Targeta de garantia
Note: The specific accessories may vary slightly depending on the region or batch.

Figure 3.1: Included accessories for the FiiO K9Pro ESS, showing the power cable, USB cable, and Bluetooth antenna.
4. Dispositiu acabatview
Familiarize yourself with the various components and interfaces of the K9Pro ESS.

Figure 4.1: Front and rear panel layout of the FiiO K9Pro ESS, indicating all ports and controls.
4.1 Tauler frontal
- XLR4 balanced headphone output: Per a connexions d'auriculars balancejades.
- Sortida d'auriculars de 6.35 mm: Sortida estàndard d'auriculars d'una sola terminació.
- 4.4mm balanced headphone output: Per a connexions d'auriculars balancejades.
- RGB indicator light: Displays current sampling rate or status.
- Pom de volum: Ajusta el volum de sortida.
- Input indicator light: Shows the active input source.
- Output selection switch: Toggles between Line Out, Pre Out, and HP Out.
- Interruptor de guany: Selects low, medium, or high gain.
- Input selection button: Cycles through available input sources (USB, Optical, Coaxial, Bluetooth, Line In).
- Botó multifunció: Power on/off, menu navigation.
4.2 Panell posterior
- Potència d'entrada: Connexió d'alimentació de CA.
- Interruptor d'alimentació: Interruptor d'alimentació principal.
- Bluetooth antenna port: Connects the Bluetooth antenna.
- Entrada coaxial: Entrada d'àudio digital.
- Entrada USB: Connects to a computer or other USB audio source.
- Entrada òptica: Entrada d'àudio digital.
- 4.4mm balanced line-in: Balanced analog input.
- Single-ended line-in (RCA): Standard analog input.
- Single-ended line-out (RCA): Standard analog output.
- Balanced line-out (XLR): Sortida analògica equilibrada.
4.3 Panell lateral
- Port USB tipus C: For connecting to portable devices or for firmware updates.
5. Guia de configuració
5.1 Connexió inicial
- Connect the provided power cable to the K9Pro ESS and a wall outlet.
- Attach the Bluetooth antenna to its designated port on the rear panel.
- Flip the main power switch on the rear panel to the "ON" position.
- Press the multifunction button on the front panel to power on the device.
5.2 Connexió de fonts d'àudio
The K9Pro ESS offers multiple input options:
- Entrada USB: Connect your computer or digital audio player via a USB cable to the USB input port.

Figure 5.2.1: Connecting the K9Pro ESS to a PC for use as a Digital-to-Analog Converter (DAC).
- Entrada òptica/coaxial: Use an optical or coaxial cable to connect to compatible digital audio sources like TVs, CD players, or game consoles.
- Entrada Bluetooth:
- Select Bluetooth as the input source using the input selection button.
- On your mobile device, search for "FiiO K9Pro ESS" in the Bluetooth settings and pair.
- The device supports high-resolution Bluetooth codecs such as LDAC, aptX Adaptive, and aptX HD.
- Line-in (RCA/4.4mm Balanced): Connect analog audio sources such as preamplificadors o altres dispositius d'àudio.
5.3 Connexió de dispositius de sortida
The K9Pro ESS provides various output options:
- Auriculars: Connect your headphones to the XLR4, 4.4mm balanced, or 6.35mm single-ended headphone outputs on the front panel.

Figure 5.3.1: The K9Pro ESS driving a pair of high-impedance headphones, demonstrating its ampcapacitats de lificació.
- Speakers/External Ampelevadors: Use the RCA or XLR balanced line-out ports on the rear panel to connect to active speakers or a power ampmés viu.

Figure 5.3.2: Integrating the K9Pro ESS into a home audio system, connected to external speakers.
6. Instruccions de funcionament
6.1 Encès/Apagat
To power on the device, ensure the rear power switch is ON, then press the multifunction button on the front panel. Press and hold the multifunction button to power off.
6.2 Selecció d'entrada
Premeu el botó Botó de selecció d'entrada repeatedly to cycle through available input sources: USB, Optical, Coaxial, Bluetooth, and Line In. The active input will be indicated by the corresponding light.
6.3 Control de volum
Gira el gran Maneta de volum on the front panel clockwise to increase volume and counter-clockwise to decrease it. The RGB indicator light around the knob may change color based on the sampvelocitat de reproducció de l'àudio que s'està reproduint.
6.4 Ajust de guany
El Interruptor de guany allows you to select between Low, Medium, and High gain settings. This is useful for matching the output level to the sensitivity of your headphones or speakers. Use a lower gain for sensitive headphones and a higher gain for power-hungry headphones.

Figure 6.4.1: Detail of the volume control and gain adjustment switches on the K9Pro ESS.
6.5 Selecció del mode de sortida
Utilitza el Interruptor de selecció de sortida to choose the desired output mode:
- HP Out: Audio is routed to the headphone outputs.
- Sortida prèvia: Audio is routed to the line-out ports with volume control (variable output).
- Sortida de línia: Audio is routed to the line-out ports at a fixed maximum level (fixed output).
6.6 MQA Playback
The K9Pro ESS supports MQA (Master Quality Authenticated) rendering. When playing MQA files, the device will unfold the audio to deliver master-level sound quality. The RGB indicator light will change to magenta to indicate MQA playback.
7. Manteniment i cura
- Neteja: Feu servir un drap suau i sec per netejar l'exterior del dispositiu. No utilitzeu netejadors líquids ni aerosols.
- Emmagatzematge: Guardeu el dispositiu en un lloc fresc i sec, allunyat de la llum solar directa i de temperatures extremes.
- Ventilació: Assegureu-vos que les ranures de ventilació no estiguin bloquejades per evitar el sobreescalfament.
- Actualitzacions de firmware: Periodically check the official FiiO weblloc web per a actualitzacions de firmware per garantir un rendiment òptim i l'accés a noves funcions.
8. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Sense sortida de so. | Incorrect input/output selection; loose cable connections; low volume. |
|
| Problemes de connexió Bluetooth. | El dispositiu no està en mode d'emparellament; interferències; distància. |
|
| So distorsionat o de mala qualitat. | Incorrect gain setting; faulty cables; source quality. |
|
9. Especificacions
| Característica | Detall |
|---|---|
| Xip DAC | Dual ES9038PRO |
| Ampmés viu | Dual THX AAA-788+ |
| Versió Bluetooth | BT5.1 |
| Bluetooth Formats Supported | LDAC, aptX Adaptive, aptX HD, aptX, aptX LL, AAC, SBC |
| USB DAC Support | Up to 384kHz/32bit, DSD256 (Native), MQA Renderer |
| Font d'alimentació | CA 110~115V (50/60Hz) |
| Entrades | USB-B/Type-C, Optical, Coaxial, Bluetooth, 4.4mm Balanced Line-in, RCA Line-in |
| Sortides d'auriculars | XLR-4, 4.4mm Balanced, 6.35mm Single-ended |
| Sortides de línia | RCA, XLR Balanced |
| Max Undistorted Output Power | ≥2100mW (32Ω balanced) / ≥1100mW (300Ω balanced) |
| Distorsió | <0.00025% (UAC, 1kHz) |
| Ràtio senyal / soroll | ≥129dB (UAC, A-weighted) |
| Dimensions (L x A x A) | 8.8 x 7.9 x 2.8 polzades (22.35 x 20.07 x 7.11 cm) |
| Pes de l'article | 6.1 lliures (2.77 kg) |

Figure 9.1: Detailed technical specifications of the FiiO K9Pro ESS.
10. Garantia i Suport
10.1 Informació de la garantia
FiiO products typically come with a limited warranty covering defects in materials and workmanship. Please refer to the warranty card included in your package for specific terms and conditions, including the warranty period and coverage details. Keep your proof of purchase for warranty claims.
10.2 Atenció al client
For technical assistance, troubleshooting, or service inquiries, please contact FiiO customer support through their official website or the contact information provided in your product documentation. You can visit the official FiiO weblloc web per obtenir els recursos de suport i les dades de contacte més recents: www.fiio.com.





