Depusheng Mini Headphone Amplifier User Manual

1. Introduction

This manual provides detailed instructions for the setup, operation, and maintenance of your Depusheng Mini Headphone Amplifier. Designed for easy and fast operation, this ultra-compact stereo audio amplifier ensures high sound quality and signal fidelity at maximum volume. It is available in 4-channel (PH400) and 6-channel (PH600) configurations.

Figure 1: Depusheng 6-Channel Headphone Amplifier (PH600)

2. Key Features

• Multi-Channel Output: Available in 4-channel (PH400) and 6-channel (PH600) configurations.
• Ultra-Low Noise: Designed with anti-crosstalk circuitry for a clean audio signal.
• Independent Volume Control: Each output channel features its own gain knob for individual volume adjustment.
• Universal Input/Output: Compatible with both 3.5mm (1/8") and 6.35mm (1/4") headphone jacks, eliminating the need for converter adapters.
• Stereo/Mono Mode (S/M Mode): Switch button to freely select between stereo and mono input audio types.
• Wide Headphone Compatibility: Suitable for 50mm driver 32~100Ω headphones.
• USB Type-C Power Supply: Convenient 5V power supply via a Type-C/USB interface, allowing power from chargers, power strips, or power banks.
• Compact and Lightweight Design: Easy to carry and integrate into any setup.
• Durable Construction: Made from heavy-gauge steel material for safety and sound quality.

Figure 2: Overview of Amplifier Features

3. Specifications

Figure 3: Product Dimensions and Weight

4. Package Contents

Ensure all items are present in the package:

• 1 x Depusheng Mini Headphone Amplifier (4-channel or 6-channel model)
• 1 x USB Data Cable (for power supply)
• 1 x User Manual

Figure 4: Package Contents

5. Setup

Follow these steps to set up your headphone amplifier:

1. Power Connection: Connect the provided USB data cable to the Type-C/USB power interface (labeled "DC 5V" or "TYPE-C") on the back of the amplifier. Connect the other end of the cable to a 5V power source such as a USB charger, power strip, or power bank. The POWER light on the amplifier will illuminate when connected correctly.
2. Audio Input Connection: Connect your audio source (e.g., mixer, computer, iPod) to the INPUT jack on the back of the amplifier. This is a hybrid interface compatible with both 3.5mm and 6.35mm TS/TRS plugs.
3. Headphone Output Connection: Connect your headphones to the PHONES output jacks on the front of the amplifier. Each channel has both 3.5mm and 6.35mm mono interfaces.

Figure 5: Connection Diagram

Figure 6: USB Type-C Power Supply Options

6. Operating Elements and Interfaces

The amplifier features the following controls and connections:

Figure 7: Front Panel Controls (6-Channel Model)

1. 5V Power Interface (TYPE-C/USB): Located on the back. Connect the power adapter here. The POWER light indicates the unit is on.
2. INPUT Jack: Located on the back. This is a hybrid 3.5mm/6.35mm jack for connecting your audio source.
3. Gain Knobs (VOLUME 1-6): Located on the front panel. Each knob adjusts the amplification factor and basic volume for its respective channel.
4. MUTE / MONO ST Switches: Located below each gain knob.
   • MUTE: Silences the main mixing channel for that output.
   • MONO ST (Stereo/Mono): Converts the signal between mono and stereo for the respective channel. When inputting a stereo sound source, press this button to ensure stereo output.
5. PHONES Output Jacks (PHONES 1-6): Located on the front panel. These are mono interfaces for connecting headphones or speakers, compatible with both 3.5mm and 6.35mm plugs.
6. POWER Indicator Light: Illuminates when the amplifier is receiving power.

For a visual guide to the operating elements and interfaces, please refer to the detailed diagram in the User Manual PDF.

7. Operation

1. Power On: Connect the power adapter to the 5V interface. The amplifier will automatically turn on, and the POWER light will illuminate.
2. Adjusting Volume: Use the individual GAIN knobs for each channel (VOLUME 1-6) to set the desired headphone volume.
3. Stereo/Mono Selection: If your input source is stereo, ensure the MONO ST switch for the desired output channel is pressed to enable stereo output. If you prefer a mono signal, ensure it is not pressed.
4. Muting Channels: Use the MUTE switch for each channel to silence its output if needed.
5. Power Off: Disconnect the power adapter from the amplifier.

Warning: High volume levels can cause hearing damage or damage to your headphones/speakers. Always turn the volume to the minimum before starting operation and gradually increase to a comfortable listening level.

Figure 8: Independent Volume Adjustment

8. User Tips

• To minimize noise, ensure all unused output channels are closed (muted or disconnected).
• When connecting multiple devices, ensure the ground wire of each device shell is connected to each other to prevent ground loops and hum.
• Always start with the volume knobs at their minimum setting before playing audio to protect your hearing and equipment.

9. Maintenance

• Keep the amplifier clean by wiping it with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
• Do not expose the unit to excessive moisture, heat, or direct sunlight.
• Store the amplifier in a cool, dry place when not in use.
• Ensure proper ventilation around the unit to prevent overheating.

10. Troubleshooting

No Power:

• Check if the USB data cable is securely connected to both the amplifier's Type-C/USB interface and the 5V power source.
• Ensure the power source is active and providing 5V.

No Sound Output:

• Verify that your audio input source is properly connected to the INPUT jack and is playing audio.
• Check that headphones are securely plugged into the PHONES output jacks.
• Ensure the individual GAIN knobs for the active channels are turned up.
• Make sure the MUTE switch for the active channels is not engaged.
• If using a stereo source, ensure the MONO ST switch is correctly set for stereo output.

Distorted Sound or Noise:

• Reduce the GAIN level for the affected channels.
• Ensure all cable connections are secure and not damaged.
• Close (mute or disconnect) any unused channels to reduce potential noise.
• Check the audio input source for distortion.

11. Warranty and Support

Depusheng offers the following support for its products:

• Free replacement of damaged products within 6 months of purchase.
• Long-term technical guidance.
• Technical personnel available for testing guidance and adjustment.

For further details and comprehensive instructions, please refer to the official User Manual (PDF).

12. Frequently Asked Questions (FAQ)

Q: What is the frequency response range of this amplifier?

A: The frequency response range is not specified in the available documentation.

Q: Can I use both 3.5mm and 6.35mm headphones simultaneously?

A: Yes, each output channel features both 3.5mm and 6.35mm mono interfaces, allowing for universal compatibility without adapters.

Q: How do I reduce noise when using the amplifier?

A: To reduce noise, ensure all unused channels are muted or disconnected. Also, check for proper grounding of connected devices.