AIYIMA DAC-A2 HiFi Audio Decoder USB Headphone Amplifier User Manual

1. Introduction

The AIYIMA DAC-A2 is a versatile HiFi Audio Decoder and USB Headphone Amplifier designed to enhance your audio experience. It supports multiple digital audio inputs including PC-USB, Optical, and Coaxial, and provides both RCA line-out and 3.5mm headphone outputs. With integrated bass and treble controls, it allows for personalized sound adjustment, making it suitable for various home audio setups, including connecting to amplifiers, powered speakers, or headphones.

2. Key Features

• Multiple Digital Inputs: Equipped with PC-USB, Optical, and Coaxial S/PDIF inputs for broad compatibility with various audio sources.
• RCA Line Output: Connects to external amplifiers or powered speakers.
• High-Fidelity Headphone Amplifier: Built-in Hi-Fi headphone amp chip capable of driving headphones with impedances from 16Ω to 200Ω, delivering 100mW RMS (32Ω load).
• Tone Controls: Independent bass and treble adjustment range of ±6dB for customized sound.
• Preamp Functionality: Can be used as a preamplifier or volume controller for PC/MAC/Computer setups.
• Compact Design: Mini-sized D/A converter with low jitter, supporting bit-perfect 24bit/192KHz HD audio.
• Output Protection: Features an output protection circuit to safeguard connected audio equipment.

3. Technical Specifications

4. Package Contents

The AIYIMA DAC-A2 package typically includes:

• 1x AIYIMA DAC-A2 Digital Audio Decoder USB DAC Unit
• 1x Fiber Optic Cable
• 1x PC-USB Cable
• 1x Type-C Charging Cable (for power supply)

5. Setup Instructions

Follow these steps to connect your DAC-A2 to your audio system:

1. Connect Audio Output: Connect the DAC-A2's RCA Audio Out (R/L) to your amplifier or powered speakers. Alternatively, for headphones, plug your 3.5mm headphones into the front panel headphone jack.
2. Connect Audio Input: Choose one of the following input methods:
   • PC-USB Input: Connect the PC-USB port on the rear panel to your computer using the provided USB cable.
   • Optical Input: Connect an optical cable from your audio source (e.g., TV, game console) to the OPTICAL input on the rear panel.
   • Coaxial Input: Connect a coaxial cable from your audio source to the COAXIAL input on the rear panel.
3. Connect Power: Connect the DC 5V power input on the rear panel to a suitable 5V power adapter using the provided Type-C charging cable. Ensure the power adapter provides stable 5V output.

6. Operating Instructions

1. Power On: Turn the VOL (Volume) knob clockwise to power on the unit. The power indicator light will illuminate.
2. Select Input: Use the input switch (USB/OPT/COA) on the front panel to select your desired audio source.
3. Adjust Volume: Rotate the VOL knob to set the desired listening volume.
4. Adjust Tone: Use the BASS and TREBLE knobs to fine-tune the low and high frequencies to your preference.
5. Headphone Output Priority: When headphones are plugged into the 3.5mm headphone jack, the RCA analog output will automatically be disconnected. To use the RCA output, ensure no headphones are connected.

PC-USB Operating Instructions:

1. Connect the DAC-A2 to your PC using the provided USB cable. The DAC-A2 is plug-and-play and should be automatically recognized by your operating system (XP/W10/W11/MAC/Linux).
2. On your PC, locate the speaker icon in the lower right corner of the taskbar.
3. Right-click the speaker icon and select "Sound Settings" or "Playback Devices".
4. In the pop-up dialog box, select the DAC-A2 as the default playback device. It should be recognized automatically without needing manual driver installation.
5. Confirm your selection.

Setting TV OPT/COA Output:

When connecting your TV via Optical or Coaxial, you may need to adjust your TV's audio settings:

1. Navigate to your TV's system settings (e.g., "Application" desktop -> "Settings" -> "Sound" -> "Sound-optical / coaxial output mode-turn on").
2. If there is still no sound after setting, adjust the TV volume to 0 through the TV remote control.
3. Note: If some TVs are equipped with external speakers, there might be no sound from the TV itself when using external audio output.

7. User Tips

• Power Supply: Ensure you use a stable 5V DC power supply. Using a power supply with high interference can introduce noise.
• Headphone Use: The DAC-A2 can directly drive headphones (16-200Ω) from sources like DVD players, providing a direct listening experience without needing additional amplification.
• Mobile Device Compatibility: The PC-USB input is primarily designed for computers (PC/MAC/Linux). Direct connection to mobile phones via USB may not be supported or require specific adapters/drivers not included.
• Volume Matching: Be mindful of volume levels from both the DAC-A2 and any connected amplifiers or powered speakers to avoid distortion. Adjust both stages appropriately.
• Signal Cables: For optimal sound quality and to minimize interference, use shielded audio cables, especially for input connections.

8. Troubleshooting

No Sound Output:

1. Power Indicator: Check if the POWER indicator is on. If not, verify the 5V power supply connection.
2. Input Selection: Ensure the correct input source (USB, OPT, COA) is selected using the front panel switch.
3. Volume Level: Confirm the VOL knob is not at its minimum setting (rotate clockwise to increase).
4. Source Device: Check if your audio source device is paused, muted, or has its volume set to minimum.
5. PC-USB Specific: If using PC-USB, ensure the DAC-A2 is selected as the default playback device in your computer's sound settings. Restarting the computer and re-selecting the device might help.
6. RCA Output: If using RCA output, ensure no headphones or headphone adapters are plugged into the 3.5mm headphone jack, as this will disable the RCA output.

Sound Distortion/Broken Sound:

The DAC-A2 acts as a pre-amplifier. If both the DAC-A2 and a connected amplifier/powered speakers are set to maximum volume, distortion can occur. Reduce the volume on either the DAC-A2 or the downstream device.

Loud Current Noise/Beep:

1. Power Supply: If not using the original standard power supply, try replacing it with a high-quality, stable 5V DC power adapter. Many third-party power supplies can introduce interference.
2. Unshielded Cables: Unshielded signal cables can pick up interference. Replace them with shielded audio cables or unplug unused input cables if you experience a loud beep when no audio source is playing.

Volume Differences Between Sources:

Different audio playback devices (e.g., mobile phone vs. CD player) have varying output signal amplitudes. This can result in different perceived volumes even if the DAC-A2's volume setting remains unchanged. This is normal behavior.

9. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid using harsh chemicals or abrasive materials.
• Environment: Keep the DAC-A2 in a dry, well-ventilated area, away from direct sunlight, heat sources, and excessive moisture.
• Handling: Handle the unit with care to prevent physical damage. Avoid dropping or subjecting it to strong impacts.
• Power Off: When not in use for extended periods, it is recommended to disconnect the power supply.

10. Warranty and Support

The AIYIMA DAC-A2 comes with a 24-month warranty from the date of purchase. For technical support, warranty claims, or any questions not covered in this manual, please contact your retailer or AIYIMA customer service.