1. Introduction
The Sunbuck AV-628BT is a 5.1-channel audio amplifier designed to deliver a high-fidelity sound experience for music enthusiasts and home entertainment. Featuring an upgraded audio processing chip, it aims to restore music with delicate layers and powerful dynamics. This amplifier is equipped with various input options, a built-in LED screen for intuitive visualization, and a robust aluminum alloy construction for durability. It is suitable for home theater setups, karaoke, parties, and personal music appreciation.
Figure 1: Front view of the Sunbuck AV-628BT Audio Amplifier.
2. Safety Information
- Read this manual carefully before operation to ensure proper use and prevent damage.
- This device operates on 220V. Ensure your power supply matches this voltage to avoid electrical hazards or damage to the unit. An appropriate adapter plug (European Plug) is included.
- Do not expose the amplifier to rain or moisture to prevent fire or electric shock.
- Ensure adequate ventilation around the unit. Do not block ventilation openings.
- Avoid placing the unit near heat sources or in direct sunlight.
- Do not open the casing. Refer all servicing to qualified personnel.
- Keep out of reach of children.
3. Package Contents
Upon unpacking, please ensure all the following items are present:
- 1x Sunbuck AV-628BT Audio Amplifier
- 1x Radio Antenna
- 1x Remote Controller
- 1x English & Chinese Manual
4. Product Overview
Familiarize yourself with the amplifier's front and back panels for proper connection and operation.
Figure 2: Detailed view of the amplifier's front and back panels.
4.1 Front Panel Controls and Inputs
- Power Switch: Turns the amplifier ON/OFF.
- SD Card Insertion: Slot for SD memory cards for audio playback.
- USB Interface: USB port for connecting USB flash drives for audio playback.
- Setting Button: For navigating menus or adjusting settings (e.g., FM radio tuning).
- MIC Input (MIC1, MIC2): 6.35mm jack inputs for microphones.
- MIC Volume Adjustment: Controls the volume level of the microphones.
- MIC Bass Adjustment: Adjusts the bass level for microphone input.
- MIC Treble Adjustment: Adjusts the treble level for microphone input.
- Echo Adjustment: Controls the echo effect for microphone input.
- Music Volume Adjustment: Main volume control for music playback.
- Balance Knob: Adjusts the left/right channel balance.
- Loudness: Enhances bass and treble at low volumes (ON/OFF switch).
- Music Treble Adjustment: Adjusts the treble level for music playback.
- Music Bass Adjustment: Adjusts the bass level for music playback.
4.2 Back Panel Connections
- RCA Input: Stereo RCA inputs for external audio sources (e.g., CD player, DVD player).
- LINE Output: RCA line-level output.
- Speaker Output: Spring clip terminals for connecting main speakers.
- SR SL C Speaker Output: Spring clip terminals for connecting surround right, surround left, and center speakers (5.1 channel).
- FM ANT: Connector for the FM radio antenna.
- Power Line: Power cord input (220V).
5. Setup Instructions
Follow these steps to set up your Sunbuck AV-628BT amplifier:
5.1 Power Connection
- Ensure the amplifier's power switch is in the 'OFF' position.
- Connect the provided power cord to the 'Power Line' input on the back panel (20).
- Plug the other end of the power cord into a 220V AC power outlet.
5.2 Speaker Connection
The amplifier supports 5.1 surround sound. Connect your speakers with an impedance of 4Ω-16Ω.
- Connect your main stereo speakers to the 'Speaker Output' terminals (17). Ensure correct polarity (+ to + and - to -).
- For 5.1 surround sound, connect your Surround Right (SR), Surround Left (SL), and Center (C) speakers to the 'SR SL C Speaker Output' terminals (18). Maintain correct polarity.
5.3 Audio Input Connections
The amplifier offers multiple ways to connect your audio sources:
- RCA Input (15): Use RCA cables to connect devices like DVD players, CD players, or other audio equipment.
- AUX Input: Connect devices via a 3.5mm to RCA cable (not explicitly labeled on diagram but implied by 'AUX' mode).
- USB Interface (3): Insert a USB flash drive containing audio files.
- SD Card Insertion (2): Insert an SD card containing audio files.
- Bluetooth 5.0: Wirelessly connect smartphones, tablets, or other Bluetooth-enabled devices (see Operating Instructions for pairing).
- Microphone Inputs (5): Plug up to two microphones into the MIC1 and MIC2 jacks for karaoke or public address.
5.4 FM Antenna Connection
- Connect the provided radio antenna to the 'FM ANT' terminal (19) on the back panel for FM radio reception.
6. Operating Instructions
This section details how to operate your amplifier and utilize its features.
Video 1: Product demonstration showing power on, input selection, and volume adjustment.
6.1 Power On/Off
- Press the 'Power Switch' (1) on the front panel to turn the amplifier ON. The LED screen will display 'HELLO' then the current input mode.
- Press the 'Power Switch' again to turn the amplifier OFF.
6.2 Input Selection
- Press the 'MODE' button (part of 4) on the front panel or the remote control to cycle through available input sources: AUX, USB, SD, Bluetooth (BT), FM. The selected mode will be displayed on the LED screen.
6.3 Volume Control
- Rotate the large 'VOLUME' knob (10) on the front panel clockwise to increase volume and counter-clockwise to decrease.
- Volume can also be adjusted using the remote control.
6.4 Tone and Balance Controls
- Music Bass Adjustment (14): Adjusts the low-frequency response of the music.
- Music Treble Adjustment (13): Adjusts the high-frequency response of the music.
- Loudness (12): Toggle this switch ON/OFF to enhance bass and treble at lower listening volumes.
- Balance Knob (11): Adjusts the relative volume between the left and right stereo channels.
6.5 Microphone Controls
- MIC Volume Adjustment (6): Controls the overall volume of the connected microphones.
- MIC Bass Adjustment (7): Adjusts the bass level for microphone audio.
- MIC Treble Adjustment (8): Adjusts the treble level for microphone audio.
- Echo Adjustment (9): Controls the intensity of the echo effect applied to microphone audio.
6.6 Bluetooth Pairing
- Select 'BT' mode using the 'MODE' button. The LED screen will indicate Bluetooth mode.
- On your Bluetooth device (smartphone, tablet), search for available devices.
- Select 'AV-628BT' from the list to pair. Once connected, the amplifier will confirm.
- The Bluetooth connection range is approximately ≤10m (32.8ft).
6.7 USB/SD Playback
- Insert a USB flash drive into the 'USB Interface' (3) or an SD card into the 'SD Card Insertion' slot (2).
- The amplifier should automatically switch to USB or SD mode and begin playback. If not, select the appropriate mode using the 'MODE' button.
- Use the playback control buttons (part of 4) on the front panel or remote for Play/Pause, Next/Previous track.
6.8 FM Radio
- Select 'FM' mode using the 'MODE' button.
- Use the 'Setting Button' (4) or remote control to scan for and select radio stations.
6.9 Remote Control Usage
- The included remote controller allows full control of the amplifier's functions from a distance of approximately 6m (19.7ft).
- Point the remote directly at the amplifier's front panel for optimal response.
Figure 3: Practical details including the remote controller.
7. Specifications
Detailed technical specifications for the Sunbuck AV-628BT amplifier:
Figure 4: Amplifier highlighting high-fidelity sound and dimensions.
| Feature | Specification |
|---|---|
| Material | Aluminum Alloy |
| Color | Black |
| Input Type | SD, USB, RCA, AUX, 5.0 Bluetooth |
| Output Type | Speakers |
| Control Methods | Hand, Remote |
| Distortion Rate | 0.5% (Under Rated Power) |
| Surround Sound Channel | 5.1-channel |
| Adapter Plug | European Plug |
| Voltage | 220V |
| Max. Power | 600W |
| Rated Power | 200W + 200W |
| Impedance | 4Ω-16Ω |
| RMS | 45W + 45W |
| Resolution | 38dB |
| SNR | 78dB |
| Number of Microphone Jacks | 2 |
| Bluetooth Connection Range | ≤10m (32.8ft) |
| Remote Controller Range | About 6m (19.7ft) |
| Remote Controller Size | 11.8*4*1.5cm (4.7*1.6*0.6in) |
| Power Cord Length | 1.2m (3.9ft) |
| Product Size | 42.7*28*6.6cm (16.8*11*2.6in) |
| Net Weight | 3.4kg (7.5lbs) |
| Gross Weight | 4.35kg (9.6lbs) |
8. Troubleshooting
If you encounter issues with your amplifier, refer to the following common problems and solutions:
- No Power:
- Check if the power cord is securely connected to both the amplifier and the 220V power outlet.
- Ensure the power switch is in the 'ON' position.
- Verify the power outlet is functional.
- No Sound:
- Check all speaker connections for correct polarity and secure attachment.
- Ensure the correct input source is selected (AUX, USB, SD, BT, FM).
- Increase the 'VOLUME' knob.
- Check the audio source device (e.g., smartphone, DVD player) for proper playback and volume settings.
- Poor Sound Quality:
- Check audio cables for damage or loose connections.
- Adjust 'Music Bass' and 'Music Treble' knobs to your preference.
- Ensure speakers are within the recommended impedance range (4Ω-16Ω).
- For Bluetooth, ensure your device is within the effective range (≤10m) and there are no obstructions.
- Remote Control Not Working:
- Ensure there are no obstructions between the remote and the amplifier.
- Check the remote's batteries and replace if necessary.
- Ensure you are within the remote's effective range (about 6m).
- Microphone Issues (No sound/Feedback):
- Ensure microphones are securely plugged into MIC1/MIC2.
- Adjust 'MIC Volume Adjustment' (6).
- Reduce 'MIC Volume' or move microphones further from speakers to prevent feedback.
9. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or aerosols.
- Ventilation: Regularly check that the heat dissipation holes on the body are not blocked to prevent overheating.
- Storage: When not in use for extended periods, store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
Figure 5: Thoughtful design features for durability and performance.
10. User Tips
- Speaker Compatibility: This amplifier requires external speakers. Ensure your speakers have an impedance between 4Ω and 16Ω for optimal performance and to prevent damage.
- Remote Control: The remote control is a physical device and does not operate via a mobile application.
- Power Voltage: The amplifier is designed for 220V power outlets. Using it with a different voltage without a proper step-up/step-down converter can damage the unit.
- Audio Source Quality: For the best sound experience, use high-quality audio files and source devices.
Figure 6: Wide application possibilities for the amplifier.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.
