1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Yoidesu LP-838 Mini HiFi 2.1 Stereo Bass Audio Power Amplifier. Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
- Ensure the power supply voltage matches the amplifier's requirements (DC 12V-14.4V).
- Do not expose the amplifier to water, moisture, or extreme temperatures.
- Avoid placing the unit in direct sunlight or near heat sources.
- Do not open the casing. Refer all servicing to qualified personnel.
- Keep out of reach of children.
- Disconnect power before making any connections or disconnections.
3. Product Features
- Full aluminum alloy casing, designed to minimize electromagnetic interference.
- High-power audio amplifier chip, delivering 15W x 2 RMS output with 2.1 channels and low distortion.
- RCA and 3.5mm audio input, compatible with various audio sources such as mobile phones, DVD players, computers, and MP3/MP4 players.
- Suitable for both vehicle and home use. Features a smart and lightweight aluminum casing.
- Two pairs of speaker output clips for easy wiring.
- Provides full control over volume, treble, and bass output.
4. Package Contents
Please check the package for the following items:
- Yoidesu LP-838 Mini HiFi Amplifier (1 unit)
- User Manual (this document)
Note: A power adapter (DC 12V-14.4V) is not included and must be purchased separately.
5. Product Overview
This image shows the Yoidesu LP-838 Mini HiFi Amplifier from a front and slightly elevated side angle. The black aluminum casing with heat sink fins is visible, along with the silver front panel featuring control knobs and input jacks. The model number 'LP-838' is clearly printed on the top surface.
A close-up of the amplifier's front panel, displaying the power switch, bass volume knob, MP3 input jack, treble control knob, bass control knob, and master volume knob. All knobs are silver with clear markings.
This image details the rear panel of the amplifier, showing the RCA audio input jacks (red for right, white for left), speaker output terminals (labeled R+ R- and L+ L-), and the DC 12V/3A power input jack. A 'Q.C. PASSED' sticker is also visible.
This image displays both the black and silver versions of the LP-838 amplifier, emphasizing its 2.1 channel subwoofer Hi-Fi amplifier design. Key specifications like 15W x 2 RMS power output, 20Hz-20KHz frequency response, <0.4% distortion, and >75dB S/N ratio are highlighted.
6. Setup Instructions
- Connect Speakers: Connect your passive speakers to the speaker output terminals on the rear panel. Ensure correct polarity (R+ to R+, R- to R-, L+ to L+, L- to L-). The amplifier supports 4-8 Ohm speakers.
- Connect Audio Source:
- For RCA input: Connect your audio source (e.g., DVD player, computer) to the RCA input jacks on the rear panel.
- For 3.5mm input: Connect your audio source (e.g., mobile phone, MP3 player) to the 3.5mm MP3 input jack on the front panel.
- Connect Power: Connect a DC 12V-14.4V power adapter (not included) to the DC 12V/3A power input jack on the rear panel.
- Power On: Flip the power switch on the front panel to the 'ON' position. The power indicator light will illuminate.
This image illustrates the rear connections of the amplifier, showing where to connect the speaker wires using the spring clips and the DC power adapter. The RCA audio input is also visible.
This image demonstrates the versatility of the amplifier's audio input options, showing it connected to a cell phone, computer, MP3/MP4 player, TV, and car audio system, highlighting its compatibility with diverse devices.
7. Operating Instructions
- Volume Control: Use the 'VOLUME' knob on the front panel to adjust the overall output volume.
- Bass Adjustment: Rotate the 'BASS' knob to increase or decrease the low-frequency output.
- Treble Adjustment: Rotate the 'TREBLE' knob to increase or decrease the high-frequency output.
- Bass Volume (Subwoofer): The 'BASS VOLUME' knob controls the output level for the subwoofer channel independently. Adjust this to balance with the main speaker volume.
- Input Selection: The amplifier automatically prioritizes the 3.5mm MP3 input if a cable is connected. If no 3.5mm input is detected, it will use the RCA input.
This close-up shows the detailed design of the silver control knobs for Treble, Bass, and Volume, along with the smaller Bass Volume knob and the MP3 input jack, illustrating the user interface for audio adjustments.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the amplifier's exterior. Do not use liquid cleaners or aerosols.
- Storage: When not in use for extended periods, disconnect the power adapter and store the unit in a cool, dry place.
- Ventilation: Ensure the amplifier has adequate ventilation to prevent overheating. Do not block the heat sink fins.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power adapter not connected or faulty; power switch off. | Check power adapter connection and ensure it's functional. Turn power switch ON. |
| No sound output | Incorrect audio input connection; speaker wires loose or incorrect polarity; volume too low. | Verify audio input cables are securely connected. Check speaker wire connections and polarity. Increase volume. |
| Distorted sound | Volume too high; faulty audio source; speaker impedance mismatch. | Reduce volume. Test with a different audio source. Ensure speakers are 4-8 Ohm. |
| Intermittent sound | Loose cable connections; faulty cable. | Check all audio and speaker cable connections. Try replacing cables. |
10. Specifications
- Model: LP-838
- Brand: Yoidesu
- Material: Aluminum Alloy
- Channels: 2.1
- Output Power: 15W x 2 RMS (30W Max)
- Frequency Response: 20Hz-20KHz
- Distortion: <0.4%
- Signal-to-Noise Ratio (S/N): >75dB
- Input Sensitivity: 200mV
- Speaker Impedance: 4-8 Ohms
- Power Supply: DC 12V-14.4V (3A recommended)
- Audio Input: RCA, 3.5mm AUX
- Item Weight: 220 Grams
- UPC: 747333958638
- Country of Origin: China