1. Product Overview
The Nobsound Hi-Fi Bluetooth 5.0 Power Amplifier is a compact and versatile audio device designed to enhance your home stereo system. It functions as a lossless wireless audio receiver, a 100W Class D digital speaker amplifier, and a PC sound card. Featuring Bluetooth 5.0 connectivity and multiple input options, it delivers clear audio output to passive speakers.
Image 1.1: Front view of the Nobsound Hi-Fi Bluetooth 5.0 Power Amplifier.
2. Package Contents
Please check the package for the following items:
- Nobsound Hi-Fi Bluetooth 5.0 Power Amplifier Unit
- AUX Cable
- USB Cable
- RCA Cable
- Power Supply Adapter
Image 2.1: All accessories included with the amplifier: AUX cable, USB cable, RCA cable, and power supply.
3. Device Layout
3.1 Front Panel
Image 3.1: Detailed diagram of the amplifier's front and rear panels, showing all indicators, inputs, and controls.
- Bluetooth Indicator: Lights up when Bluetooth input is active.
- Sound Level Indicator: Visual representation of audio output levels (VU Meter).
- AUX Indicator: Lights up when AUX input is active.
- USB Indicator: Lights up when USB input is active.
- Power Indicator: Shows power status.
- AUX IN: 3.5mm audio input jack.
- USB IN: USB port for PC sound card function.
- Multi-function Knob: Rotates to adjust volume; long press for power on/off.
3.2 Rear Panel
- Right Speaker Out (R): Connects to the right passive speaker.
- Left Speaker Out (L): Connects to the left passive speaker.
- DC IN: Power input port (9-24V).
4. Setup and Connections
Follow these steps to set up your Nobsound amplifier:
- Connect Speakers: Connect your passive speakers to the "Right Speaker Out (R)" and "Left Speaker Out (L)" terminals on the rear panel. Ensure correct polarity (+ to + and - to -).
- Connect Power: Plug the provided power adapter into the "DC IN" port on the rear panel, then plug the adapter into a wall outlet.
- Choose Audio Input: Select your desired audio source.
- Bluetooth: No cable needed. The Bluetooth indicator will light up when selected.
- AUX: Connect an audio source (e.g., phone, tablet, MP3 player) to the "AUX IN" 3.5mm jack on the front panel using the AUX cable. The AUX indicator will light up.
- USB (PC Sound Card): Connect the amplifier to your computer's USB port using the USB cable. The USB indicator will light up.
Image 4.1: Connection diagram illustrating how to connect speakers and various audio input devices (Bluetooth, AUX, USB) to the amplifier.
5. Operating Instructions
5.1 Power On/Off
To power on the amplifier, long press the multi-function knob. Long press it again to power off the unit.
5.2 Volume Control
Rotate the multi-function knob clockwise to increase the volume and counter-clockwise to decrease it.
Image 5.1: The multi-function knob serves as both the power switch (long press) and volume control (rotating).
5.3 Input Selection
The amplifier automatically detects the active input. The corresponding indicator (Bluetooth, AUX, or USB) on the front panel will light up.
5.4 Bluetooth Pairing
When Bluetooth is selected as the input, the Bluetooth indicator will flash. On your device (phone, tablet, etc.), search for Bluetooth devices and select "Nobsound" or a similar name. Once paired, the Bluetooth indicator will glow steadily.
Image 5.2: The amplifier supports Bluetooth 5.0 for stable and extended-range wireless audio transmission.
6. Maintenance
To ensure the longevity and optimal performance of your amplifier, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to wipe the exterior of the amplifier. Avoid using liquid cleaners or abrasive materials, as they may damage the finish or internal components.
- Placement: Place the amplifier in a well-ventilated area, away from direct sunlight, heat sources, and excessive moisture. Ensure there is adequate space around the unit for proper airflow.
- Power Off When Not in Use: If the amplifier will not be used for an extended period, it is recommended to power it off and unplug it from the power outlet.
7. Troubleshooting
If you encounter issues with your amplifier, please refer to the following common problems and solutions:
| Problem | Possible Cause / Solution |
|---|---|
| No sound output |
|
| Bluetooth connection issues |
|
| Amplifier powers off unexpectedly |
|
| Input does not switch automatically or defaults to a different input |
|
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Douk Audio (Nobsound) |
| Model Number | 8541737967 |
| Connectivity Technology | Auxiliary, Bluetooth 5.0, RCA, USB |
| Compatible Devices | Speakers |
| Connector Type | 3.5mm Jack, RCA, USB |
| Output Power | 50 Watts per channel (100 Watts total) |
| Number of Channels | 2 |
| Audio Output Type | Speakers |
| Item Weight | 1.14 pounds (approx. 517 grams) |
| Package Dimensions | 6.97 x 6.61 x 2.13 inches |
9. Warranty and Support
For warranty information or technical support, please contact Douk Audio customer service. You can find more information and contact details on the official Douk Audio store page:
