Nobsound MX5 4-Channel Stereo Audio Mixer User Manual

1. Introduction

The Nobsound MX5 is an ultra-low noise 4-channel stereo audio mixer designed for various audio applications, including clubs, studios, and bars. It features four groups of 6.35mm/3.5mm inputs and one group of 6.35mm/3.5mm output, offering compatibility with a wide range of audio devices such as CD players, computers, phones, preamplifiers, and amplifiers. Each channel includes an independent mono/stereo switch, allowing for flexible mixing of different audio signals. The MX5 also incorporates a 16-bit stereo dual-color LED level meter for visual monitoring of output levels and dynamic decoration of your audio space.

2. Safety Information

Please read and understand the following safety guidelines before operating the Nobsound MX5 audio mixer:

• Ensure the device is powered by a stable DC 5V (≥0.5A) power source via the Type-C USB interface.
• Do not expose the device to water, moisture, or extreme temperatures.
• Avoid dropping or subjecting the device to severe impacts.
• Do not attempt to open or repair the device yourself. Refer all servicing to qualified personnel.
• Keep the device away from strong magnetic fields.
• Use only compatible cables and connectors.

3. Package Contents

Verify that all items are present in the package:

• 1 × MX5 Audio Mixer
• 1 × USB Cable (Type-C)

4. Product Overview

The Nobsound MX5 features a compact design with an all-metal case and aluminum knobs for durability and effective isolation from external interference. Gold-plated RCA terminals ensure stable signal transmission.

Controls and Ports:

• Input Jacks (1-4): Four groups of 6.35mm/3.5mm input jacks for connecting audio sources.
• Stereo/Mono Select Switches (S/M 1-4): Independent switches for each channel to select between stereo (S) and mono (M) input modes.
• Independent Volume Knobs (1-4): Adjust the input level for each of the four channels.
• Main Volume Knob (VOL): Controls the overall output volume.
• OUT Jack: 6.35mm output for connecting to external audio equipment.
• Headphone Jack: 3.5mm output for headphones. (Note: This output has priority; the 6.35mm OUT will disconnect if headphones are plugged in.)
• DC IN 5V/1A (Type-C): Power input port.
• Power Button: Turns the device on/off.
• Power Indicator: Illuminates when the device is powered on.
• Color Select Knob: Adjusts the color of the LED level meter.
• Mode Select Knob: Changes the display mode of the LED level meter.
• 16-bit LED Level Meter: Visual display of audio output levels.

5. Setup

1. Power Connection: Connect the provided Type-C USB cable to the "DC IN 5V/1A" port on the MX5. Connect the other end to a DC 5V (≥0.5A) USB power adapter (not included).
2. Connect Audio Sources:
   • Connect your audio sources (e.g., phone, computer, CD player, preamplifier) to the input jacks (1-4) using either 6.35mm or 3.5mm cables.
   • Important Note: The MX5 is designed for standard audio signals. Do not connect phono turntables or microphones directly without an appropriate preamplifier.
3. Connect Output Device:
   • For external audio equipment (e.g., active speakers, amplifier), connect a 6.35mm cable from the "OUT" jack on the MX5 to your device's input.
   • For headphones, connect them to the 3.5mm headphone jack. Remember that the 3.5mm headphone output takes priority, and the 6.35mm OUT will be automatically disconnected when headphones are plugged in.
4. Power On: Press the Power Button. The Power Indicator light will illuminate.

6. Operating Instructions

6.1 Basic Mixing

1. Adjusting Individual Channel Volume: Use the four independent volume knobs (1-4) to control the input level of each connected audio source. This allows you to balance the sound of different devices without interference.
2. Adjusting Main Volume: Use the "VOL" knob to control the overall output volume of the mixed audio.

6.2 Stereo/Mono Selection

Each input channel (1-4) has an independent Stereo/Mono select switch (S/M). This allows you to configure each input as either a stereo signal or a mono signal, providing flexibility for various mixing needs.

• S (Stereo): For stereo audio sources, the left and right channels will be processed separately.
• M (Mono): For mono audio sources, or if you wish to combine a stereo source into a single mono signal.

6.3 LED Level Meter Operation

The built-in 16-bit stereo dual-color LED level meter provides a visual representation of the audio output level. You can customize its appearance and behavior:

• Color Select Knob: Rotate this knob to cycle through different color schemes for the LED display.
• Mode Select Knob: Rotate this knob to change the display mode of the LED meter (e.g., peak hold, bar graph).
• Gain Adjustment: The display gain can be adjusted from Level 1 to Level 6 to suit different output levels and preferences.

The MX5 supports power-off memory, retaining your last selected display settings.

7. Specifications

8. Troubleshooting

If you encounter issues with your Nobsound MX5, please refer to the following common problems and solutions:

• No Sound Output:
  • Ensure the MX5 is powered on and the power indicator is lit.
  • Check all audio cable connections to ensure they are secure.
  • Verify that the main volume knob and individual channel volume knobs are turned up.
  • If using headphones, ensure they are fully plugged into the 3.5mm jack. Remember that the 6.35mm OUT is disabled when headphones are connected.
  • Confirm that your audio source is playing and its volume is adequate.
• Distorted Sound:
  • Reduce the volume on both the MX5 and your audio source to prevent clipping.
  • Check cable quality and connections.
  • Ensure the input impedance of your source matches the MX5's input impedance (50kΩ).
• LED Meter Not Displaying:
  • Ensure the MX5 is powered on.
  • Check if the display mode or color settings have been adjusted to an invisible setting. Try rotating the Color and Mode select knobs.
  • Verify that audio is actually being outputted through the mixer.
• Device Not Powering On:
  • Ensure the Type-C USB cable is properly connected.
  • Verify that your DC 5V power adapter is functioning correctly and provides at least 0.5A.
  • Try a different USB cable or power adapter.

9. User Tips

While no specific user reviews or Q&A were provided, here are some general tips for optimizing your experience with the Nobsound MX5:

• Cable Management: Use high-quality, shielded audio cables to minimize noise and interference, especially in environments with many electronic devices.
• Gain Staging: Start with all volume knobs (individual channels and main volume) at their lowest setting. Gradually increase the volume of your audio sources, then individual channel volumes, and finally the main volume to achieve a clean signal without distortion.
• Experiment with Stereo/Mono: Don't hesitate to experiment with the Stereo/Mono switches for each channel. For some instruments or vocal tracks, a mono signal might sit better in the mix.
• LED Meter Customization: Utilize the LED meter's customizable colors and modes to match your aesthetic preferences or to quickly identify clipping (often indicated by red segments).
• Power Supply: Although not included, investing in a reliable, low-noise DC 5V USB power adapter can contribute to cleaner audio performance.

10. Maintenance

To ensure the longevity and optimal performance of your Nobsound MX5:

• Cleaning: Use a soft, dry cloth to clean the exterior of the device. Avoid using liquid cleaners or solvents, as they may damage the finish or internal components.
• Storage: When not in use for extended periods, store the mixer in a cool, dry place, away from direct sunlight and dust.
• Cable Care: Handle cables carefully. Avoid sharp bends or kinks that can damage the internal wiring.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please contact the retailer or manufacturer directly. Keep your purchase receipt as proof of purchase.