1. Product Overview
The Sunbuck AV-555BT and AV-628BT are multifunctional audio power amplifiers designed for both home and commercial use. These amplifiers integrate Bluetooth connectivity, multi-channel input options, and a dual dynamic display. They support 5-channel audio output, making them suitable for various audio playback scenarios such as home theater systems, KTV setups, and background music.
Key features include:
- 5-channel output: Supports multi-speaker layouts for immersive surround sound.
- Built-in Bluetooth: Allows wireless music playback from Bluetooth-enabled devices like phones, tablets, and computers.
- Dual dynamic screen: Provides real-time display of volume, frequency, input source, and other operational parameters.
- Multiple inputs: Supports USB/SD card direct playback, AUX wired input, and FM radio for diverse audio sources.
- Microphone interface: Includes microphone input with adjustable volume and reverb, ideal for karaoke.
- EQ adjustment: Built-in treble, bass, and balance controls for customized audio styles.
2. Setup and Connection
2.1 Power Connection
- Ensure the power switch on the amplifier is in the "OFF" position.
- Insert the power cord into the AC power socket on the back of the amplifier.
- Connect the other end of the power cord to a 110V (for US Plug models) or 220V (for EU Plug models) mains outlet.
- Turn on the power switch.
Important: Select the appropriate voltage model (110V or 220V) according to your country's mains voltage to prevent damage to the amplifier.
2.2 Speaker Connection
Use speaker wires to connect the 5 speaker output terminals (L, R, C, SL, SR) on the back of the amplifier to your corresponding speakers. Pay close attention to the positive/negative polarity (red for positive, black for negative) and ensure all connections are secure to prevent short circuits.
2.3 Audio Source Connection
- Bluetooth Connection: Enable Bluetooth on the amplifier. On your phone/tablet, search for "AV-555BT" (or similar for AV-628BT) in the Bluetooth device list and pair. Once paired, you can stream music wirelessly.
- USB/SD Card: Insert a USB drive or SD card into the corresponding slot on the front panel. The amplifier will automatically detect and play audio files.
- AUX Input: Use a 3.5mm audio cable or RCA cable to connect external audio sources (e.g., TV, DVD player, computer) to the amplifier's AUX input ports.
- FM Radio: Connect the FM antenna to the designated jack on the rear panel. Use the panel buttons to auto-scan or manually tune to stations.
2.4 Microphone Connection
Insert a microphone into the front-panel microphone jack. You can then adjust the microphone volume and reverb knobs for karaoke or public announcements.
3. Operation Instructions
3.1 Front Panel Controls (AV-555BT)
- Power Switch: Controls the main power on/off.
- Mic Reverb Delay (1): Adjusts the delay effect for microphone reverb.
- Mic Reverb Volume (2): Controls the volume of the microphone reverb.
- Mic Bass Adjustment (3): Adjusts the bass level for microphone input.
- Mic Treble Adjustment (4): Adjusts the treble level for microphone input.
- Wired Mic Socket (5): Input for wired microphones.
- Wireless Mic Socket (6): Input for wireless microphones.
- Wireless Mic Volume Adjustment (7): Controls the volume of wireless microphones.
- Music Bass Adjustment (8): Adjusts the bass level for music playback.
- Music Treble Adjustment (9): Adjusts the treble level for music playback.
- Left and Right Balance (10): Adjusts the audio balance between left and right channels.
- Loop Playback (11): Controls loop playback for media.
- Previous Song (12): Skips to the previous track.
- Play/Pause (13): Plays or pauses the current track.
- Next Song (14): Skips to the next track.
- Function Selection (15): Cycles through input sources (Bluetooth, USB, SD, AUX, FM).
- Mic Volume: Main volume knob for microphone.
- Music Volume: Main volume knob for music.
- SD/USB Card Slot: For media playback.
3.2 Front Panel Controls (AV-628BT)
- Power Switch: Controls the main power on/off.
- USB Disk Socket: For media playback.
- Dynamic Display Screen: Shows current input source, volume, frequency, and other information.
- Media Controls (1-5): Loop Playback (1), Previous Song (2), Play/Pause (3), Next Song (4), Function Selection (5).
- Mic Jack (MIC1, MIC2): Inputs for microphones.
- Microphone Volume (6): Adjusts microphone volume.
- Microphone Bass (7): Adjusts bass for microphone input.
- Microphone Treble (8): Adjusts treble for microphone input.
- Microphone Reverberation (9): Adjusts microphone echo/reverb effect.
- Volume Adjustment (Main Volume): Controls overall output volume.
- Music Bass: Adjusts bass for music playback.
- Music Treble: Adjusts treble for music playback.
- Loudness (Constant Sound Switch): Toggles loudness enhancement.
- Balance: Adjusts audio balance between left and right channels.
3.3 Basic Operation Flow
- Connect power and turn on the power switch. The amplifier will enter standby mode.
- Select an input source (e.g., Bluetooth, USB, AUX, FM) using the input selection button or remote control. Connect the corresponding audio source.
- Adjust the main volume to a suitable listening level.
- Customize treble, bass, and balance settings as desired using the EQ adjustment knobs.
- If using a microphone, first adjust the microphone volume and reverb to avoid feedback.
- After use, lower the volume to minimum, turn off the power switch, and then disconnect the power cord.
4. Maintenance and Precautions
- Do not use the amplifier in damp, high-temperature, or dusty environments to prevent equipment damage.
- When connecting speakers, never short-circuit the output terminals, as this will damage the amplifier module.
- Avoid prolonged high-volume playback to prevent overheating of speakers and the amplifier.
- Clean the device with a dry cloth only; do not use liquid cleaners.
- If abnormal noise, smoke, or other issues occur, immediately turn off the power and contact after-sales support.
5. Troubleshooting
| Symptom | Possible Cause | Solution |
|---|---|---|
| No sound output | Power not connected, incorrect input source selected, loose speaker connections | Check power, switch input source, re-connect speakers |
| Bluetooth pairing failed | Distance too far, device Bluetooth not enabled, excessive interference | Reduce distance, enable device Bluetooth, move away from interference sources |
| Microphone feedback | Volume too high, microphone too close to speakers | Lower microphone volume, place microphone away from speakers |
| Poor FM reception | Antenna not connected, poor location | Connect antenna, adjust device position |
6. Specifications
| Item | Specification (AV-555BT) | Specification (AV-628BT) |
|---|---|---|
| Model Number | AV-555BT | AV-628BT |
| Output Channels | 5 channels (supports multi-scenario audio output) | |
| Bluetooth | Built-in Bluetooth module | Built-in Bluetooth 5.0 |
| Display | Dual dynamic digital display showing working status and parameters | |
| Input Interfaces | USB, SD card, AUX, FM radio, Bluetooth, microphone input | |
| Output Interfaces | 5 groups of speaker output interfaces, supporting multi-speaker connection | |
| Power Supply | AC 220V-240V/50Hz (compatible with domestic mains) | AC 110V/220V (selectable) |
| Maximum Power Per Channel | Max 2500W (Total) | Max 500W+500W+120W (Total) |
| Rated Power (RMS) | Not specified in OCR | 250W+250W+120W |
| Rated Impedance | 4 to 16 Ω | |
| Frequency Response | 20Hz-20KHz(+/-10dB) | 20KH-20KHz |
| Signal to Noise Ratio | 90dB | 90dB |
| Total Harmonic Distortion | ≤ 0.5% | 0.01% |
| Input Sensitivity | 150mV | Not specified |
| Dimensions (W x D x H) | 43cm x 24cm x 11cm (including machine feet) | 430mm x 220mm x 70mm |
| Machine Net Weight | 4.3KG | Not specified |
| Material | Metal | Aluminum alloy |
| Certification | CE | |
Internal Components
7. User Tips
- This amplifier is a cost-effective solution for building a comprehensive audio system, especially when paired with a CD player for 5-channel music listening.
- While advertised with high peak power, the realistic continuous power output (RMS) is approximately 200 watts. Manage expectations accordingly for sustained high-volume use.
- The amplifier supports connecting multiple audio sources simultaneously, including musical instruments like pianos and guitars, along with microphones, making it versatile for various entertainment needs.
8. Warranty and Support
This product is covered by the manufacturer's warranty, details of which can be found on the included warranty card.
For after-sales support, please contact official customer service or your dealer. Be prepared to provide the product model and your purchase receipt for assistance.
9. Packaging Contents
The package typically includes:
- Sunbuck AV-555BT/AV-628BT Power Amplifier x1
- Power cord x1
- Remote Control x1
- FM Antenna x1
- User Manual x1
- Warranty card x1
- Gift (e.g., 32GB USB Card) x1 (subject to actual packaging)
