Amulech AL-38432DS Hi-Fi USB DAC User Manual

1. Introduction

Thank you for purchasing the Amulech AL-38432DS Hi-Fi USB DAC. This device is designed to provide high-fidelity audio playback from your computer, supporting high-resolution PCM audio up to 384KHz/32Bit and DSD audio up to 11.2MHz (DSD256). It incorporates the high-performance ESS Technology ES9018K2M DAC chip and a TPA6130A2 electronic volume headphone amplifier IC for exceptional sound quality.

This manual provides detailed instructions on how to set up, operate, and maintain your AL-38432DS to ensure optimal performance and longevity.

2. Product Overview

2.1. Front Panel

The front panel of the AL-38432DS features the following controls and indicators:

• POWER Switch: Toggles the device power On/Off.
• USB Indicator: Illuminates when a USB connection is established.
• Headphone Output (6.35mm): Connect your headphones here.
• Volume Knob: Controls the output volume for both headphone and line outputs.
• Sample Rate Indicators (LEDs): A series of LEDs indicating the current PCM sample rate (48, 96, 192, 384 KHz) or DSD sample rate (2.8, 5.6 MHz).

2.2. Rear Panel

The rear panel provides the following connection ports:

• LINE OUT (RCA L/R): Analog audio output for connecting to an amplifier or active speakers.
• USB AUDIO INPUT (Type B): Connects to your computer for digital audio input.
• DC IN (+9V~12V): Power input jack for the included AC adapter.

3. Setup

Follow these steps to set up your Amulech AL-38432DS:

3.1. Power Connection

1. Ensure the POWER switch on the front panel is in the OFF position.
2. Connect the provided AC adapter to the DC IN port on the rear panel of the AL-38432DS.
3. Plug the AC adapter into a wall outlet.

3.2. Connecting to a Computer (USB Audio Input)

1. Using a standard USB Type A to Type B cable (not included), connect the USB AUDIO INPUT port on the rear panel of the AL-38432DS to an available USB port on your computer.
2. For Windows users, you may need to install a dedicated driver for DSD native playback. Please refer to the Amulech website for the latest driver downloads. For macOS, the device is typically plug-and-play.
3. Once connected, turn on the AL-38432DS using the front panel POWER switch. The USB indicator LED should illuminate.
4. Select the AL-38432DS as your audio output device in your computer's sound settings or preferred audio playback software.

3.3. Connecting to an Audio System (Line Out)

1. Using RCA cables (not included), connect the LINE OUT (RCA L/R) ports on the rear panel of the AL-38432DS to the analog input (e.g., AUX, CD, Line In) of your amplifier, receiver, or active speakers.
2. Ensure the volume knob on the AL-38432DS is set to a low level before playing audio to prevent sudden loud sounds.

4. Operating Instructions

4.1. Powering On/Off

To power on the device, toggle the POWER switch on the front panel to the ON position. To power off, toggle it back to the OFF position.

4.2. Volume Control

The large knob on the front panel controls the output volume for both the headphone output and the RCA line output. Rotate clockwise to increase volume and counter-clockwise to decrease volume. It is recommended to start with a low volume setting and gradually increase it to a comfortable listening level.

4.3. Sample Rate Indicators

The LEDs on the front panel indicate the current sample rate of the audio being played. For PCM audio, the corresponding LED (48, 96, 192, 384 KHz) will illuminate. For DSD audio, the 2.8 or 5.6 MHz LED will light up, indicating DSD64 or DSD128/DSD256 respectively.

5. Specifications

Image Description: This image displays a detailed block diagram of the AL-38432DS's internal components and connections, along with a table of technical specifications. While the text in the image is in Japanese, the diagram illustrates the signal flow from USB input to DAC and output stages.

6. Troubleshooting

If you encounter issues with your AL-38432DS, please refer to the following common problems and solutions:

• No Sound Output:
  • Ensure the device is powered on and the power adapter is securely connected.
  • Verify that the USB cable is properly connected to both the DAC and your computer.
  • Check your computer's sound settings to ensure the AL-38432DS is selected as the default audio output device.
  • Confirm that the volume knob on the AL-38432DS is turned up and not muted in your software.
  • Check the connections to your amplifier/speakers or headphones.
• Distorted or Intermittent Sound:
  • Ensure all cables are securely connected and not damaged.
  • Try a different USB port on your computer.
  • Reduce the volume level on the DAC or your amplifier to check for clipping.
  • Ensure your audio files are not corrupted.
• Device Not Recognized by Computer:
  • Disconnect and reconnect the USB cable.
  • Restart your computer.
  • For Windows, ensure the correct USB audio driver is installed. Visit the Amulech website for driver downloads.
  • Try connecting to a different USB port or a different computer to isolate the issue.

7. Maintenance

To ensure the longevity and optimal performance of your AL-38432DS, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to wipe the exterior of the device. Do not use liquid cleaners, aerosols, or abrasive materials, as they may damage the finish or internal components.
• Placement: Place the device on a stable, flat surface away from direct sunlight, heat sources, and excessive moisture. Ensure adequate ventilation around the unit.
• Handling: Avoid dropping or subjecting the device to strong impacts.
• Power Off When Not in Use: If the device will not be used for an extended period, it is recommended to power it off and disconnect the power adapter.

8. Warranty and Support

This product comes with a manufacturer's warranty. Please refer to the warranty card included with your product or visit the official Amulech website for detailed warranty terms and conditions. For technical support, driver downloads, or further assistance, please contact Amulech customer service through their official channels.

Note: Product specifications and appearance are subject to change without prior notice for improvement.