1. Introduction
The Nobsound M10 is a compact yet powerful digital amplifier designed to enhance your audio experience. Featuring Bluetooth 5.4, USB-C, and 3.5mm AUX inputs, it offers versatile connectivity for a wide range of devices. With its TPA3255 amplifier chip, it delivers up to 300W per channel, effortlessly driving 4-8Ω speakers. This manual provides detailed instructions for setup, operation, and troubleshooting to help you get the most out of your M10 amplifier.
2. Key Features
- Multiple Inputs for Versatile Use: Connect via Bluetooth 5.4, USB-C, or 3.5mm AUX. Compatible with phones, tablets, TVs, CD players, and PCs/laptops (USB-C plug-and-play, no driver needed for Windows).
- HiFi Audio in a Compact Body: Equipped with the TPA3255 chip, delivering a maximum output of 300W×2. Drives 4–8Ω speakers with ease, fitting seamlessly into any desktop or shelf system.
- Next-Gen Bluetooth 5.4 Streaming: Features a QCC3084 chip supporting aptX-HD, aptX-Lossless, and LDAC for high-resolution wireless audio. Enjoy stable, low-latency music streaming with an easy Bluetooth reset function.
- Personalized Tone Control with Clear Status Lights: Fine-tune your sound with dedicated treble and bass knobs. Real-time LED indicators clearly show the active input mode and power status.
- Designed for Seamless Daily Use: Wide DC 19–48V input and multiple built-in protection circuits ensure reliable operation. Its sleek metal chassis and smart functions make it ideal for home stereo upgrades.
3. Package Contents
Please check the package carefully for the following items:
- 1 × Nobsound M10 Amplifier
- 1 × DC 32V/5A Power Adapter (Optional, depending on purchase)
- 1 × USB Cable
- 1 × User Manual
4. Product Overview
Familiarize yourself with the controls and connections of your Nobsound M10 amplifier.
Front Panel Controls:
- Play / Pause / Clear Bluetooth Button: Controls Bluetooth playback and clears paired Bluetooth devices.
- AUX IN: 3.5mm audio input jack.
- BASS Knob: Adjusts low-frequency output.
- TREBLE Knob: Adjusts high-frequency output.
- Power / Volume Knob: Turns the unit on/off and controls the overall volume.
- Input Indicator:
- Blue: Bluetooth Input
- Green: AUX Input
- Yellow: USB Input
- Standby / Protection Indicator: Red light indicates standby, overload, short circuit, or overheating.
Rear Panel Connections:
- Right Speaker Output (+/-): Connects to the right passive speaker.
- Left Speaker Output (+/-): Connects to the left passive speaker.
- USB-C Input: Connects to a computer for USB audio playback.
- DC 19-48V IN: Power input jack (5.5*2.5mm).
5. Setup Instructions
Follow these steps to set up your Nobsound M10 amplifier:
- Connect Speakers: Connect your passive speakers to the banana speaker jacks on the rear panel. Ensure correct polarity (+ to + and - to -) for both left and right channels.
- Connect Power: Connect the DC 19-48V power adapter (if included or purchased separately) to the DC IN port on the rear panel, then plug the adapter into a power outlet.
- Connect Audio Source: Choose your preferred audio input:
- AUX Input: Connect your audio source (e.g., phone, tablet, CD player) to the 3.5mm AUX IN jack on the front panel using a 3.5mm audio cable.
- USB Input: Connect your Windows PC or laptop to the USB-C port on the rear panel using the provided USB cable. No driver installation is required for Windows 7-11.
- Bluetooth Input: Ensure no AUX cable is connected and Bluetooth playback is paused if previously used. The M10 will default to Bluetooth input when no other wired input is active.
- Power On: Turn the Power/Volume knob clockwise to power on the amplifier. The input indicator LED will light up according to the active input.
6. Operating Instructions
6.1 Power On/Off and Volume Control
Rotate the Power/Volume knob clockwise to turn the amplifier on and increase volume. Rotate counter-clockwise to decrease volume and turn off the amplifier.
6.2 Input Selection
The M10 automatically prioritizes inputs as follows: AUX > Bluetooth > USB.
- AUX Input: When an AUX cable is connected, the amplifier will automatically switch to AUX input (Green indicator).
- Bluetooth Input: To use Bluetooth (Blue indicator), ensure no AUX cable is connected. If a USB device is connected, pause USB playback.
- USB Input: To use USB (Yellow indicator), ensure no AUX cable is connected and pause any active Bluetooth playback.
6.3 Bluetooth Pairing
- Ensure the amplifier is in Bluetooth mode (Blue indicator).
- On your device (phone, tablet), search for Bluetooth devices and select "Nobsound M10".
- Once paired, the blue indicator will remain steady.
- To clear paired Bluetooth devices and reset for a new connection, press and hold the Play/Pause button.
6.4 Tone Control
Use the BASS and TREBLE knobs on the front panel to adjust the low and high frequencies of your audio output to match your acoustic space or personal preferences.
6.5 Play/Pause Functionality
The Play/Pause button on the front panel is specifically for controlling Bluetooth playback. It does not control playback when using AUX or USB inputs; for these modes, control playback directly from your source device.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or solvents.
- Ventilation: Ensure the amplifier is placed in a well-ventilated area to prevent overheating. Do not block any ventilation openings.
- Storage: When not in use for extended periods, disconnect the power adapter and store the unit in a cool, dry place.
8. Troubleshooting
If you encounter any issues with your Nobsound M10 amplifier, please refer to the following common problems and solutions:
- Q: Is it normal for the M10 to become warm during operation?
- A: Yes, it is normal. The M10 uses a high-efficiency TPA3255 amplifier chip, which naturally generates heat during use. When powered with a 32V supply, the surface temperature may reach around 113°F (45°C). This does not affect its performance or lifespan.
- Q: Why does the M10 shut down automatically during use?
- A: The M10 requires a power supply with at least 100W output. Auto shut-off usually indicates that your speakers demand more power than the current power supply can provide. Please reduce the volume or use a higher-wattage power adapter.
- Q: Is the included power adapter sufficient?
- A: The 32V/5A adapter (if included with your purchase) is sufficient for most home speakers. If you purchased the version without a power supply or require higher output for demanding speakers, please use a high-quality adapter with adequate power (e.g., 100W or more).
- Q: How do I switch between AUX, Bluetooth, and USB inputs?
- A: The M10 has an input priority: AUX > Bluetooth > USB.
- AUX takes priority when connected.
- To use Bluetooth, disconnect the AUX cable.
- To use USB, disconnect the AUX cable and pause any active Bluetooth playback.
- Q: Which systems support USB input on the M10?
- A: USB input works only with Windows computers (Windows 7 to 11, no driver needed, plug and play). It does not support phones, Macs, or other OTG devices.
- Q: Why doesn’t the Play/Pause button work in AUX / USB mode?
- A: The Play/Pause function only controls Bluetooth playback. For AUX / USB mode, please control playback directly from your source device.
- Q: Can I replace the NE5532 op-amps?
- A: No, the NE5532 op-amps are surface-mounted and are not user-replaceable.
9. Specifications
| Parameter | Value |
|---|---|
| Brand | Nobsound |
| Model | M10 |
| Audio Input | Bluetooth 5.4 / USB-C / 3.5mm AUX |
| Audio Output | Banana speaker jacks |
| Chipset | QCC3084 + TPA3255 + NE5532 |
| Max. Output Power | 300W*2 |
| Bluetooth Version | 5.4 |
| Bluetooth Supported Codecs | SBC/AAC/LC3/aptX/aptX-HD/aptX-Adaptive/aptX-Lossless/LDAC |
| Max Sampling Rate (USB/Bluetooth) | 24-bit / 96kHz |
| Frequency Response | 30Hz-20KHz |
| SNR | ≥96dB |
| Matched Speaker Impedance | 4-8Ω |
| Working Voltage | DC 19-48V (5.5*2.5mm) |
| Dimensions (W*D*H) | 78*124*23mm / 3.07*4.88*0.91in |
| Package Dimensions (W*D*H) | 210*165*60mm / 8.26*6.49*2.36in |
| Net Weight | 218g / 0.48lb |
| Package Weight (without power adapter) | 400g / 0.88lb |
| Package Weight (with power adapter) | 1.0kg / 2.20lb |
10. User Tips
- For optimal performance, especially with demanding speakers, consider using a high-quality power adapter with an output of 100W or more.
- Remember the input priority (AUX > Bluetooth > USB) when switching sources to avoid confusion.
- If you experience any audio dropouts or unexpected shutdowns, first check your power supply and ensure it meets the amplifier's requirements.
- While the amplifier can get warm during operation, this is normal for the TPA3255 chip and does not indicate a fault unless accompanied by other issues.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided with your purchase or contact Nobsound customer service through their official channels. Keep your proof of purchase for any warranty claims.
