1. Introduction
The 1Mii B75 Mini Bluetooth 5.4 Stereo Amplifier is a compact yet powerful audio device designed to enhance your home audio experience. It delivers up to 100W (50W x 2) of output power, capable of driving most household passive speakers. With multiple input options including Bluetooth, USB, AUX, and Optical, it offers versatile connectivity for various audio sources.
2. What's in the Box
Please check the package contents to ensure all items are present:
- B75 Amplifier ×1
- 24V/3A Power Supply ×1
- USB Cable ×1
- 3.5mm Cable ×1
- Optical Cable ×1
3. Setup Guide
Follow these steps to set up your 1Mii B75 amplifier:
3.1 Power Connection
- Connect the provided 24V/3A power supply to the DC 9V-24V input port on the rear of the B75 amplifier.
- Plug the power supply into a wall outlet.
3.2 Speaker Connection
Connect your passive speakers to the amplifier using speaker cables. The B75 is recommended for 4~8 ohm speakers and is not suitable for subwoofers or active speakers.
- Identify the positive (+) and negative (-) terminals on your speakers and on the B75 amplifier.
- Connect the positive terminal of the left speaker to the 'L+' terminal on the amplifier and the negative terminal to the 'L-' terminal.
- Repeat for the right speaker, connecting to the 'R+' and 'R-' terminals.
3.3 Bluetooth Pairing
- Turn on the B75 amplifier using the ON/OFF switch. The indicator light will flash red and blue alternately, indicating it's in pairing mode.
- Activate Bluetooth on your mobile phone or other audio device.
- Search for "B75" in the list of available devices and select it to pair.
- Once paired, the B75 indicator light will remain blue.
3.4 Wired Connections (AUX/USB/Optical)
The B75 amplifier supports multiple wired input options. Wired mode takes precedence over Bluetooth mode. When a wired connection is active, Bluetooth will be disconnected.
AUX/USB Input:
- Connect your audio source device (e.g., PC, CD player) to the B75 via the provided 3.5mm AUX cable or USB cable.
- When using the AUX input, the B75 indicator light will turn green. For USB input, the light will turn red.
Optical Input:
- Connect your audio source device (e.g., TV) to the B75 via the provided Optical cable.
- When using the Optical input, the B75 indicator light will turn orange.
- Important for TV Optical: Set the SOUND OUTPUT of your TV SOUND SETTINGS to "External Speaker" or "Optical Out", and set the DIGITAL AUDIO FORMAT to PCM (or Stereo).
4. Operating Instructions
Once connected, you can operate your 1Mii B75 amplifier:
- Power On/Off: Use the ON/OFF switch on the front panel.
- Volume Control: Rotate the large knob on the top of the amplifier to adjust the volume. Turn clockwise to increase volume, counter-clockwise to decrease.
- Input Selection: The amplifier automatically prioritizes wired inputs (AUX, USB, Optical) over Bluetooth. To switch between wired inputs, disconnect the current wired source and connect the desired one. To use Bluetooth, ensure no wired sources are connected.
User Guide Video
5. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 2.99 x 2.81 x 1.56 inches |
| Item Weight | 3.53 ounces |
| Model Number | B75 |
| Manufacturer | 1Mii |
| Voltage | 24 Volts |
| Maximum Supply Voltage | 24 Volts |
| Minimum Supply Voltage | 9 Volts |
6. Troubleshooting
If you encounter issues with your 1Mii B75 amplifier, please review the following common points:
- No Sound: Ensure the amplifier is powered on, speakers are correctly connected, and the volume is turned up. Check that the correct input source is selected (wired connection takes precedence over Bluetooth).
- Bluetooth Pairing Issues: Make sure the amplifier is in pairing mode (flashing red and blue light). Ensure Bluetooth is enabled on your device and that you are within range. Disconnect any existing wired connections.
- Optical Input No Sound (from TV): Verify that your TV's audio output settings are configured to "External Speaker" or "Optical Out", and the digital audio format is set to PCM (or Stereo).
- Distorted Sound: Check speaker impedance (recommended 4~8 ohm). Ensure speaker cables are securely connected and not frayed. Reduce volume if distortion occurs at high levels.
- Compatibility: This amplifier is not suitable for subwoofers or active speakers. It is designed for passive speakers only.
7. Maintenance
To ensure the longevity and optimal performance of your 1Mii B75 amplifier, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Avoid using liquid cleaners or abrasive materials.
- Placement: Place the amplifier in a well-ventilated area to prevent overheating. Avoid direct sunlight, heat sources, and excessive moisture.
- Handling: Handle the device with care. Avoid dropping or subjecting it to strong impacts.
- Storage: If storing the amplifier for an extended period, disconnect it from the power supply and store it in a cool, dry place.
8. Warranty and Support
For warranty information and technical support, please refer to the official 1Mii website or contact their customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
You can visit the 1Mii Store for more information: 1Mii Official Store
