KGUSS FX-Audio DAC-X3PRO USB DAC Headphone Amplifier User Manual

1. Product Overview

The KGUSS FX-Audio DAC-X3PRO is a high-performance Digital-to-Analog Converter (DAC) and headphone amplifier designed to enhance your audio experience. It features an OP Amp diffuser circuit for improved sound quality and driving force, ASRC USB transmission technology, and supports various digital inputs. This device is suitable for use with smartphones, desktops, DVD players, CD players, and televisions.

Key Features:

• Integrated Headphone Amplifier with OP Amp diffuser circuit.
• ASRC USB transmission technology supporting up to 24Bit/96kHz sampling rate.
• Adaptive USB power supply, with option for direct DC power.
• Smartphone OTG drive support for portable HiFi audio.
• High-quality components including CS8416, ESS9023 DAC, and NE5532 op-amp.

2. Package Contents

Please verify that all items are present in the package:

• 1 x DAC-X3 PRO Unit
• 1 x USB Cable
• 1 x Power Input Line
• 1 x DC 5V1A Power Adapter
• 1 x User Manual & Warranty Card

3. Setup Instructions

3.1 Front Panel Controls

1. Multi-function Button (SELECT / ON/OFF): Short press to turn on or switch input sources (COA, OPT, USB OUT). Long press for 3 seconds to turn off the device.
2. Signal Indicators: LEDs indicating the currently selected input source (COA, OPT, USB OUT).
3. 3.5mm Headphone Output Jack (PHONE): Connect your headphones here.
4. Volume Control Knob (VOLUME): Rotate to adjust the headphone output volume.

3.2 Rear Panel Connections

• PC-USB Input: Connect to a computer for audio playback. No driver installation is required; the device is plug-and-play.
• Optical Input (OPTICAL IN): Connect to devices with an optical audio output.
• Coaxial Input (COAXIAL IN): Connect to devices with a coaxial audio output.
• RCA Outputs (OUTPUT L/R): Connect to an external amplifier or active speakers.
• DC 5V Power Input (POWER): Connect the provided 5V DC power adapter.

3.3 Power Supply

The DAC-X3PRO utilizes adaptive USB power supply technology. If a USB cable is inserted separately, it can automatically convert to USB power for the entire unit. For higher power demands or stable operation, it is recommended to supply power directly from the DC 5V socket using the included power adapter.

3.4 Connecting to a Computer (PC-USB)

Connect the DAC-X3PRO to your computer using the provided USB cable. The device will be recognized automatically by most operating systems without the need for driver installation. Select the DAC-X3PRO as your audio output device in your computer's sound settings.

3.5 Connecting to a Smartphone (OTG)

The DAC-X3PRO supports smartphone OTG drive. Connect your smartphone to the PC-USB input using an appropriate OTG cable. This allows you to listen to HiFi music directly from your mobile device. Note: Android smartphones can often be connected directly to USB power, but other devices may require an external power supply for the DAC-X3PRO.

4. Operating Instructions

4.1 Power On/Off

To power on the device, short press the multi-function button on the front panel. To power off, long press the multi-function button for approximately 3 seconds.

4.2 Input Selection

After powering on, short press the multi-function button repeatedly to cycle through the available input sources: Coaxial (COA), Optical (OPT), and USB. The corresponding LED indicator will illuminate to show the active input.

4.3 Volume Adjustment

Rotate the volume control knob clockwise to increase the headphone output volume and counter-clockwise to decrease it. Ensure the volume is set to a low level before connecting headphones to prevent sudden loud sounds.

5. Maintenance

To ensure the longevity and optimal performance of your DAC-X3PRO, follow these maintenance guidelines:

• Keep the device in a clean, dry environment, away from direct sunlight, heat sources, and excessive moisture.
• Clean the exterior with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
• Do not block ventilation openings.
• Avoid dropping or subjecting the device to strong impacts.

6. Troubleshooting

If you encounter issues with your DAC-X3PRO, please refer to the following common troubleshooting steps:

• No Power: Ensure the DC 5V power adapter is securely connected to both the device and a working power outlet. If using USB power, ensure the USB cable is properly connected to a powered USB port.
• No Sound Output:
  • Verify that the correct input source is selected (COA, OPT, USB) using the multi-function button.
  • Check headphone connections and ensure they are fully inserted into the 3.5mm jack.
  • Adjust the volume knob to an audible level.
  • Ensure your source device (computer, smartphone, etc.) is playing audio and its volume is not muted or too low.
  • If using RCA outputs, ensure your external amplifier or active speakers are powered on and correctly connected.
• Distorted Sound / Popping Noises:
  • Ensure all cables are securely connected and not damaged.
  • Try a different audio source or cable to rule out external interference.
  • If using USB, ensure your computer's USB port is stable and not experiencing power fluctuations. Using the dedicated DC 5V power adapter may resolve issues related to USB power instability.
  • Reduce the volume level on both the DAC-X3PRO and the source device.
• Device Not Recognized by Computer:
  • Try connecting to a different USB port on your computer.
  • Restart your computer.
  • Ensure the USB cable is functioning correctly.

If the problem persists after trying these steps, please contact customer support.

7. Specifications

8. Warranty and Support

The manufacturer provides a warranty for this product. Please refer to the included warranty card for specific terms and conditions. Key aspects of support include:

• More than 1 year of quality restoration, covering repair and shipping costs.
• 24/7 customer support available to answer any questions you may have.

For further assistance or to explore other products, please visit the KGUSS Store on Amazon.