1. Introduction
Thank you for choosing the Sunbuck AV-555BT or AV-628BT HiFi Stereo Digital Bluetooth Amplifier. This versatile 5-channel amplifier is designed to enhance your audio experience for home theater, karaoke, and general music playback. It features Bluetooth connectivity, FM radio, USB/SD card playback, and multiple microphone inputs, delivering clear, strong, and powerful sound.
2. Important Safety Information
- Voltage Selection: The amplifier is available in 110V (US Plug) and 220V (EU Plug) versions. Ensure you have selected the appropriate voltage for your region to prevent damage to the amplifier. The 220-240V equipment is compatible with voltages below 240V.
- Do not expose this appliance to rain or moisture.
- Do not open the casing. Refer all servicing to qualified personnel.
- Ensure proper ventilation around the unit. Do not block ventilation openings.
- Disconnect the power plug from the outlet if the unit will be unused for long periods.
3. Package Contents
Upon opening your package, please verify that all the following items are included:
- 1 x AV-555BT or AV-628BT Audio Power Amplifier
- 1 x Remote Control
- 1 x FM Antenna
- 1 x User Manual
- 1 x 32GB USB Card (gift)
4. Product Overview
4.1 Front Panel Controls (AV-555BT)
- Power Switch
- Mic Reverb Delay
- Mic Reverb Volume
- Mic Bass Adjustment
- Mic Treble Adjustment
- Wired Mic Socket
- Wireless Mic Socket
- Wireless Mic Volume Adjustment
- Music Bass Adjustment
- Music Treble Adjustment
- Left and Right Balance
- Loop Playback Button
- Previous Song Button
- Play/Pause Button
- Next Song Button
- Function Selection Button (MODE)
- SD Card Slot
- USB Socket
4.2 Front Panel Controls (AV-628BT)
- Power Switch
- USB Disk Socket
- Playback Control Buttons (Loop Playback, Previous Song, Play/Pause, Next Song, Function Selection)
- Mic Jack (MIC1, MIC2)
- Microphone Volume
- Microphone Bass
- Microphone Treble
- Microphone Reverberation (Echo)
- Music Bass
- Music Treble
- Loudness Switch
- Balance Control
- Volume Adjustment
- Dynamic Display Screen
4.3 Rear Panel Connections (AV-555BT)
- Radio Antenna Jack
- Audio Input Port (AUX1)
- Audio Input Port (AUX2)
- Audio Output Port (can be connected to an active subwoofer)
- Right Channel Speaker Output
- Left Channel Speaker Output
- Right Surround Sound Channel Speaker Output
- Center Channel Speaker Output
- Left Surround Sound Channel Speaker Output
- 110V/220V Power Cord Input
4.4 Rear Panel Connections (AV-628BT)
- Audio Input (AUX1, AUX2, LINE)
- Audio Output (can be connected to active speakers)
- Speaker Output Terminals (Left Channel, Right Channel, Center Speaker Interface, Left Surround, Right Surround)
- Radio Antenna Socket
- Power Input (110V/220V)
4.5 Internal Components
- Ring copper large buffalo transformer: Provides a continuous source of energy.
- Built-in mute fan: For cooling and stable operation.
- Voltage safety fuse: Protects against power surges.
- Filtering capacitors (e.g., 4x3300): Store and regulate power.
- Toshiba amplification tubes (e.g., 4x5198): Key components for audio amplification.
- Built-in 5.0 Bluetooth module.
- Pure aluminum radiator: For efficient heat dissipation.
- Switch on/off Protective relay.
5. Setup Instructions
5.1 Power Connection
- Ensure the amplifier's power switch is in the 'OFF' position.
- Connect the power cord to the amplifier's power input on the rear panel.
- Plug the power cord into a wall outlet with the correct voltage (110V for US plug, 220V for EU plug).
5.2 Speaker Connection
Connect your speakers to the appropriate speaker output terminals on the rear panel. Ensure correct polarity (+ to + and - to -) for each speaker. The amplifier supports speakers with an impedance of 4 to 16 ohms.
- Left/Right Channels: Connect your main stereo speakers.
- Center Channel: Connect your center speaker for dialogue.
- Surround Channels (Left/Right): Connect your surround speakers for immersive audio.
5.3 Audio Source Connection
Connect your audio sources (e.g., TV, CD player, DVD player, computer, MP3 player) to the RCA audio input ports (AUX1, AUX2, LINE) on the rear panel.
5.4 Microphone Connection
Connect wired microphones to the MIC1 and MIC2 jacks on the front panel. For wireless microphones, ensure they are properly paired and connected to the wireless mic socket (AV-555BT) or via Bluetooth (AV-628BT, if applicable).
5.5 FM Antenna Connection
For FM radio reception, connect the included FM antenna to the radio antenna jack on the rear panel. For optimal reception, extend the antenna fully.
6. Operating Instructions
6.1 Power On/Off
Press the 'POWER' switch on the front panel to turn the amplifier on or off.
6.2 Source Selection
Press the 'MODE' or 'Function Selection' button on the front panel or remote control to cycle through available input sources: Bluetooth, FM Radio, USB, SD Card, AUX (Line In).
6.3 Bluetooth Operation
- Press the 'MODE' button repeatedly until the screen displays 'BLUE' (Bluetooth mode).
- On your mobile phone or other Bluetooth device, search for available devices and select 'BT' to connect.
- Once connected, you can play audio from your device through the amplifier.
6.4 FM Radio Operation
- Press the 'MODE' button until 'FM' mode is displayed (numbers will appear).
- For the first use, press the 'Play/Pause' button to automatically search for and save radio stations.
- Use the 'Previous Song' and 'Next Song' buttons to navigate through saved stations.
6.5 USB/SD Card Playback
Insert a USB disk or SD card into the respective slot on the front panel. The amplifier will automatically switch to USB/SD mode and begin playback. Use the playback control buttons (Loop Playback, Previous Song, Play/Pause, Next Song, Function Selection) to manage your music.
6.6 Microphone and Audio Adjustments
- Microphone Controls: Adjust 'Mic Volume', 'Mic Reverb Delay', 'Mic Reverb Volume', 'Mic Bass Adjustment', and 'Mic Treble Adjustment' (AV-555BT) or 'Microphone Volume', 'Microphone Bass', 'Microphone Treble', 'Microphone Reverberation' (AV-628BT) to suit your preference.
- Music Controls: Use 'Music Bass Adjustment', 'Music Treble Adjustment', 'Volume', and 'Left and Right Balance' to fine-tune the overall sound output. The AV-628BT also features a 'Loudness' switch.
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 ventilation openings are clear and not obstructed 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.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected; Power switch off; Blown fuse | Check power cord connection; Turn power switch on; Replace fuse (if qualified) |
| No sound from input source (TV, CD, VCD) | Incorrect input source selected | Press the 'MODE' or 'Function Selection' button to select the correct input source. |
| Bluetooth not connecting | Not in Bluetooth mode; Device not discoverable | Ensure amplifier is in 'BLUE' mode; Make sure your device's Bluetooth is on and discoverable. |
| Poor FM radio reception | FM antenna not connected or poorly positioned | Connect the FM antenna securely; Adjust antenna position for better signal. |
| No sound from speakers | Speakers not connected; Volume too low; Incorrect impedance | Check speaker connections and polarity; Increase volume; Ensure speakers are 4-16Ω. |
9. Specifications
| Feature | AV-555BT | AV-628BT |
|---|---|---|
| Power Amplifier Type | AV Power Amplifier | |
| Channels | 5.0 | |
| Maximum Power | 2500W | 1120W (Overall Performance) |
| Rated Power | Main 250W+250W, Surround 100W+100W, Center 100W | RMS 250W+250W+120W |
| Voltage | AC 110V/220V (50Hz) | |
| Standard Impedance | 4 to 16Ω | |
| Frequency Response | 20Hz-20KHz (+/-10dB) | |
| Input Sensitivity | 150mV | |
| Signal to Noise Ratio | 90dB | Not specified |
| Total Harmonic Distortion | ≤ 0.5% | 0.01% |
| Bluetooth Version | 5.0 | |
| Material | Metal | Aluminum Alloy |
| Color | Black | |
| Dimensions (W x D x H) | Not specified | 430mm x 220mm x 70mm |
| Net Weight | 4.3 KG | Not specified |
10. User Tips
- Versatile Connectivity: This amplifier is well-suited for connecting multiple audio sources simultaneously, including musical instruments like pianos and guitars, alongside microphones, making it ideal for home entertainment and small events.
- Voltage Check: Always double-check the voltage requirement (110V or 220V) before plugging in to avoid any electrical issues.
- Sound Customization: Experiment with the separate bass, treble, and balance controls for both music and microphones to achieve your desired sound profile.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your purchase receipt as proof of purchase.
