1. Product Overview
The Sunbuck AV-608BT is a versatile Hi-Fi 5.0CH Stereo Karaoke Audio Amplifier designed for home theater and small party environments. It features Bluetooth 5.0 connectivity, FM radio, USB/SD card input, and multiple audio inputs, along with microphone inputs for karaoke. The amplifier supports 115V/230V power conversion and comes with a remote control.
Figure 1: Front view of the AV-608BT amplifier with key features.
Key Features:
- Bluetooth 5.0 for wireless audio streaming.
- FM radio tuner.
- USB and SD card input for media playback (supports up to 64GB).
- Two signal inputs: DVD and AUX.
- LINE output for connecting to an active subwoofer or other audio equipment.
- Center surround output (5 channels including center one, surround two).
- Two microphone inputs for karaoke with reverberation and delay adjustment.
- 5-band EQ mixer for precise audio control.
- 115V/230V power conversion.
- Includes a remote control.
2. Setup Instructions
2.1 Unpacking
Carefully remove the amplifier and all accessories from the packaging. Ensure all components listed in the 'Packaged included' section are present.
2.2 Power Voltage Selection
The amplifier supports both 115V and 230V power inputs. Locate the voltage toggle switch on the rear panel (refer to Figure 3 and Figure 4) and set it to match your local power supply before connecting the power cable.
Figure 4: Internal view showing the voltage toggle switch.
2.3 Connecting Speakers
Connect your passive speakers to the 'SPEAKER OUTPUT' terminals on the rear panel. The amplifier supports speaker impedances from 4 to 16 ohms. Ensure correct polarity (red to red, black to black) for optimal sound quality. The terminals are labeled SR (Surround Right), C (Center), SL (Surround Left) for the spring clip terminals, and Left/Right channel for the binding post terminals.
Figure 3: Rear panel connections.
Video 1: Product unboxing, speaker connection, and basic operation demonstration.
2.4 Connecting Audio Sources
- DVD/AUX Inputs: Connect external audio devices (e.g., DVD player, CD player, TV, smartphone via 3.5mm to RCA cable) to the 'AUDIO INPUT' terminals (AUX1 or AUX2) on the rear panel.
- LINE Output: If you wish to connect an active subwoofer or another amplifier, use the 'LINE Output' RCA jacks.
- USB/SD Card: Insert a USB disk or SD card (up to 64GB, not included) into the respective slots on the front panel.
2.5 Connecting FM Antenna
Connect the included FM radio antenna to the 'FM ANT' terminal on the rear panel for improved radio reception.
2.6 Connecting Microphones
Plug up to two microphones into the 'MIC1' and 'MIC2' input jacks on the front panel.
Figure 5: Microphone input jacks.
2.7 Power Connection
After all other connections are made and the voltage switch is correctly set, connect the AC power cord to the 'AC Input' on the rear panel and then to a suitable power outlet.
3. Operating Instructions
3.1 Front Panel Controls
Figure 2: Front panel controls and display.
- Power ON/OFF: Use the large 'POWER' button on the left to turn the amplifier on or off.
- Volume: Adjust the main output volume using the large 'VOLUME' knob.
- LOUD ON/OFF: Activates or deactivates the loudness function for enhanced bass and treble at low volumes.
- Balance: Adjusts the balance between the left and right audio channels.
- Treble/Bass: Fine-tune the high and low frequencies of the music.
- MIC VOL: Controls the volume of the connected microphones.
- ECHO: Adjusts the echo effect for the microphones.
- Function Keys: Use these buttons to navigate menus, change tracks, or switch modes (Digital, USB/SD/MMC, KARAOKE, FM/BT).
- SD/USB: Insert your SD card or USB drive for media playback.
3.2 Remote Control
The included remote control allows for convenient operation from a distance. It typically controls power, volume, input selection, track navigation, and FM tuning. (Note: 2*AAA batteries are not included for the remote control).
Figure 6: Amplifier with remote control.
3.3 Bluetooth Pairing
- Turn on the amplifier and switch to 'BT' (Bluetooth) mode using the front panel function keys or remote. The LED display will show 'BLUE'.
- Enable Bluetooth on your smartphone, tablet, laptop, or other device.
- Search for available devices and select 'AV-608BT' to pair.
- Once paired, you can stream audio wirelessly to the amplifier.
Figure 7: Bluetooth 5.0 connectivity.
3.4 FM Radio Operation
Switch to 'FM' mode. Use the function keys or remote control to scan for stations or manually tune to your desired frequency (87.5-108MHz). Ensure the FM antenna is properly connected for best reception.
3.5 USB/SD Card Playback
Insert a USB disk or SD card into the corresponding slot. The amplifier will automatically switch to USB/SD mode and begin playing compatible audio files. Use the function keys or remote to navigate tracks.
Figure 8: SD Card and USB inputs.
4. Maintenance
4.1 Cleaning
Wipe the exterior of the amplifier with a soft, dry cloth. Do not use liquid cleaners or solvents, as they may damage the finish or internal components.
4.2 Fuse Replacement
In case of a power surge or internal fault, the fuse may blow. Disconnect the power cord before attempting to replace the fuse. The fuse holder is located near the AC input on the rear panel (refer to Figure 4 for internal view of fuse location). Replace with a fuse of the same type and rating.
5. Troubleshooting
- No Power: Ensure the power cord is securely connected and the voltage switch is set correctly. Check the power outlet and the amplifier's fuse.
- No Sound: Verify all audio input and speaker connections are secure and correctly polarized. Ensure the correct input source is selected and the volume is turned up. Check if the 'LOUD' button is engaged if sound is too low.
- Bluetooth Connection Issues: Make sure the amplifier is in 'BT' mode and your device's Bluetooth is enabled and searching. Try unpairing and re-pairing the device. Ensure no other devices are actively connected to the amplifier via Bluetooth.
- Poor FM Reception: Extend and adjust the FM antenna for better signal. Try repositioning the amplifier.
- Microphone Hissing/Interference: Ensure microphone cables are properly connected. Try adjusting the 'MIC VOL' and 'ECHO' controls. Move microphones away from speakers to prevent feedback.
- Subwoofer Connection: If connecting a subwoofer, ensure it is an active (powered) subwoofer and connected to the 'LINE Output' of the amplifier.
6. Specifications
| Feature | Specification |
|---|---|
| Model | AV-608BT |
| Size (L×W×H) | 360 × 70 × 240 mm (approx. 14.2 x 2.8 x 9.5 inches) |
| Rated Voltage | 115V/230V (Conversion) |
| Rated Power | 1200W |
| Peak Power | 2000W |
| Maximum Power Per Channel | Above 200W |
| Rated Frequency | 20Hz - 20KHz |
| Signal to Noise Ratio | 90dB |
| Standard Impedance | 4 to 16 ohm |
| Amplifier Type | AV Power Amplifier |
| Channel | 2.0 Channel |
| Total Harmonic Distortion | ≤ 0.5% |
| Signal Input Sensitivity | 200mv (± 30mv) |
| Microphone Input Sensitivity | 9 mv (± 2mv) |
| Recording Level Output | 1V |
| Auxiliary Level Output | 1V |
| Supported Media | USB Disk, Max 64GB SD Card |
| Color Options | Black, Gold |
| Certification | CE |
7. Warranty and Support
For any technical issues, warranty claims, or support inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.
8. User Tips
- The microphone works well for karaoke, and the echo depth can be adjusted for desired effect.
- The 'LOUD' button effectively enhances bass and treble, providing a fuller sound.
- Bluetooth connectivity is generally quick and stable with most devices.
- This amplifier can effectively drive speakers with 4-ohm impedance, even powerful ones.
- If you want to connect a subwoofer, use an active (powered) subwoofer and connect it to the 'LINE Output' on the rear panel.
