Nobsound Q4 Mini Bluetooth 5.0 Stereo Receiver USB DAC Instruction Manual

1. Product Overview

The Nobsound Q4 is a versatile Mini Bluetooth 5.0 Stereo Receiver and Digital-to-Analog Converter (DAC) designed to enhance your home audio system. It features multiple input options including Bluetooth, PC-USB, U-disk, Optical, and Coaxial S/PDIF, allowing seamless integration with various audio sources. The device delivers high-fidelity audio with a bit-perfect 24Bit/192KHz HD low jitter signal and includes an output protection circuit for safety.

Key features include:

• Multiple Inputs: Bluetooth 5.0, PC-USB, U-disk, Optical, and Coaxial S/PDIF.
• High-Resolution Audio: Supports up to 24Bit/192KHz HD audio.
• Dual Analog Outputs: RCA output for amplifiers/powered speakers and a headphone output (16-300Ω).
• Tone Control: Adjustable bass and treble knobs for personalized sound.
• Remote Control: Full-function remote for convenient operation.
• Compact Design: Durable aluminum alloy casing with a unique mirror finish.

Figure 1: Front view of the Nobsound Q4 Mini Bluetooth 5.0 Stereo Receiver USB DAC.

2. Package Contents

Please check the package contents upon unboxing to ensure all items are present:

• Nobsound Q4 Mini Bluetooth Receiver & D/A Converter
• Remote Control (batteries not included)
• USB Power Cable
• USB Data Cable
• Bluetooth Antenna

Figure 2: Included accessories with the Nobsound Q4 DAC.

3. Device Layout and Connections

Familiarize yourself with the front and rear panels of the Nobsound Q4 for proper setup and operation.

Figure 3: Labeled diagram of the Nobsound Q4 front and rear panels.

Front Panel:

• 3.5mm Headphone Output: Connect headphones (16-300Ω).
• Input Indicators: LEDs for USB, BT (Bluetooth), COA (Coaxial), OPT (Optical), PC-USB.
• Infrared (IR) Receiver: For remote control signals.
• Bass Knob: Adjusts low-frequency output.
• Treble Knob: Adjusts high-frequency output.
• Volume Knob / Input Select / Power Switch: Controls volume, switches input modes, and powers the device on/off.

Rear Panel:

• PC-USB Input: Connect to a computer or mobile device (with OTG support).
• OPT (Optical) Input: Connect to devices with optical audio output.
• COA (Coaxial) Input: Connect to devices with coaxial audio output.
• RCA Output (R/L): Connect to an amplifier or powered speakers.
• BT (Bluetooth) Antenna Port: Connect the included Bluetooth antenna.
• DC 5V IN: Power input (USB-C port).
• U-disk Input: USB-A port for playing audio from a USB flash drive.

4. Setup Instructions

Follow these steps to set up your Nobsound Q4:

1. Connect Bluetooth Antenna: Screw the included Bluetooth antenna into the BT antenna port on the rear panel.
2. Connect Audio Output:
   • For speakers/amplifier: Connect the RCA output (R/L) on the rear panel to your amplifier or powered speakers using appropriate RCA cables.
   • For headphones: Plug your headphones into the 3.5mm headphone output on the front panel.
3. Connect Audio Input: Choose one of the following input methods:
   • PC-USB: Connect the USB data cable from the PC-USB port on the rear panel to your computer. For mobile phones with OTG function, an OTG cable (Android) or camera kit (iOS) may be required (not included).
   • Optical: Connect an optical cable from your audio source (e.g., TV, CD player) to the OPT input on the rear panel.
   • Coaxial: Connect a coaxial cable from your audio source to the COA input on the rear panel.
   • U-disk: Insert a USB flash drive containing audio files into the U-disk input on the rear panel.
   • Bluetooth: Ensure the Bluetooth antenna is connected. You will pair your device later during operation.
4. Connect Power: Connect the USB power cable to the DC 5V IN port on the rear panel and plug the other end into a 5V USB power adapter (not included) or a USB port on your computer/TV.
5. Power On: Rotate the Volume Knob on the front panel clockwise to power on the device. The input indicators will light up.

Figure 4: Illustration of PC-USB and U-disk input connections.

5. Operating Instructions

5.1 Power On/Off

To power on the device, rotate the Volume Knob clockwise. To power off, rotate it counter-clockwise until it clicks.

5.2 Input Selection

You can select the input source by pressing the Volume Knob (short press) or using the remote control. The corresponding input indicator LED on the front panel will illuminate.

• Bluetooth (BT): Select BT input mode. On your audio device (phone, tablet, etc.), search for "Nobsound Q4" in the Bluetooth settings and pair.
• PC-USB: Select PC-USB input mode. Your computer should recognize the device automatically.
• U-disk: Select U-disk input mode. The device will automatically play audio files from the connected USB flash drive. Note: U-disk input takes priority over Bluetooth. If a U-disk is plugged in, Bluetooth input will not be available. Unplug the U-disk to use Bluetooth.
• Optical (OPT): Select OPT input mode.
• Coaxial (COA): Select COA input mode.

Figure 5: Close-up of the input indicator LEDs.

5.3 Volume Control

Rotate the Volume Knob on the front panel clockwise to increase volume and counter-clockwise to decrease it. The remote control also provides volume adjustment.

5.4 Tone Control

Use the Bass and Treble knobs on the front panel to adjust the low and high frequencies of the audio output. This allows for personalized sound tuning.

Figure 6: Bass and Treble adjustment knobs on the Nobsound Q4.

5.5 Remote Control

The included remote control provides convenient access to power, input selection, volume, and playback controls (for U-disk input). Ensure AAA batteries are inserted (not included).

Figure 7: The Nobsound Q4 with its remote control, highlighting practical functions.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Avoid using liquid cleaners or solvents.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Handle the device with care to prevent damage. Avoid dropping or subjecting it to strong impacts.

7. Troubleshooting

If you encounter issues with your Nobsound Q4, please refer to the following common solutions:

• No Sound Output:
  • Ensure the device is powered on and the correct input source is selected.
  • Check all audio cables (RCA, headphone) are securely connected.
  • Verify the volume level on the Q4 and your connected amplifier/speakers is not set to minimum or muted.
  • If using PC-USB, ensure the Nobsound Q4 is selected as the audio output device in your computer's sound settings.
• Bluetooth Connection Issues:
  • Ensure the Q4 is in Bluetooth input mode (BT indicator lit).
  • Make sure no U-disk is plugged into the Q4, as U-disk input takes priority.
  • Ensure the Bluetooth antenna is securely attached.
  • Move your Bluetooth device closer to the Q4 to ensure a strong signal.
  • Try unpairing and re-pairing the Q4 from your device's Bluetooth settings.
• U-disk Playback Issues:
  • Ensure the U-disk is properly inserted and contains compatible audio files.
  • Select U-disk input mode.
• Remote Control Not Working:
  • Check if batteries are correctly inserted and have sufficient charge.
  • Ensure there are no obstructions between the remote and the Q4's IR receiver.

8. Specifications

9. Warranty and Support

For product support, technical assistance, or warranty inquiries, please contact Nobsound customer service. You can also visit the official Nobsound store on Amazon for more information and contact options.

• Return Policy: This product typically has a 15-day return/replacement policy. Please refer to your purchase platform's specific return policy for details.
• Nobsound Store: For additional support and product information, visit the Nobsound Store on Amazon.