1. Product Overview
The Sunbuck AV-660BT is a compact 2.0-channel Hi-Fi karaoke audio amplifier, featuring Bluetooth 5.0 connectivity, USB/SD card playback, FM radio, and dual microphone inputs with echo control. It is designed for home entertainment, small KTV setups, and background music systems, delivering clear, dynamic sound with easy operation via front-panel controls or a remote control.
2. Specifications
| Item | Specification |
|---|---|
| Model | AV-660BT |
| Output Channels | 2.0-channel stereo |
| Bluetooth Version | 5.0 |
| Input Interfaces | USB, SD card, AUX (MIC input), Bluetooth 5.0, FM radio |
| Microphone Inputs | 2 x MIC jacks (MIC1, MIC2) with independent volume and echo control |
| EQ Controls | Treble, Bass adjustment |
| Display | Digital LCD screen showing input source, FM frequency, and playback status |
| Power Supply | AC 220V/50Hz (or 110V/60Hz, depending on regional version), DC12V |
| Dimensions | 200mm x 70mm x 190mm (7.9'' x 2.8'' x 7.5''), Desktop-sized chassis with a built-in FM antenna |
| Rated Power | 400W |
| Peak Power | 800W |
| Rated Frequency | 20Hz - 20KHz |
| Signal to Noise Ratio | 90dB |
| Standard Impedance | 4 to 16 ohm |
| 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 Storage | USB Disk/Max 64GB SD Card (Not included) |
| Color Options | Black, White |
3. Key Features
- Bluetooth 5.0 Connectivity: Seamlessly pairs with smartphones, tablets, and laptops for wireless music streaming with stable connectivity.
- 2.0-Channel Stereo Output: Delivers clear, balanced stereo sound for music, movies, and karaoke performances.
- Dual Microphone Inputs: Supports two microphones with independent volume and echo controls, ideal for karaoke and voice announcements.
- Multimedia Playback: Supports USB flash drive and SD card direct playback of MP3 audio files.
- FM Radio Function: Built-in FM tuner with auto-scan and manual tuning capabilities, using the included telescopic antenna for better reception.
- EQ Adjustment: Treble and bass controls allow you to customize the audio output to your preference. Also features a 5-band EQ mixer.
- Remote Control: Includes a remote control for convenient operation of input selection, volume, and playback functions from a distance.
- Compact Design: The desktop-sized chassis is easy to install and fits well in home or small commercial environments.
- Power Conversion: Supports 115V/230V power conversion.
- Reverberation, Fine Tuning, Balance: Advanced audio controls for enhanced sound.
4. Installation & Connection
4.1 Power Connection
- Connect the power cord to the AC input on the rear panel, then plug the other end into a grounded electrical outlet.
- Ensure the power switch is in the "OFF" position before connecting to power to avoid inrush current damage.
4.2 Speaker Connection
- Use speaker wires to connect the left (L) and right (R) speaker terminals on the rear panel to your speakers.
- Observe polarity markings (red = positive, black = negative) to ensure correct phasing and avoid audio distortion. Secure all connections tightly.
4.3 Audio Source Connection
- Bluetooth Pairing: Power on the amplifier, select the "BT" input mode, and enable Bluetooth on your device. Search for "AV-660BT" in the device list and complete the pairing.
- USB/SD Card Playback: Insert a USB flash drive or SD card into the corresponding slots. The amplifier will automatically detect and play supported audio files (MP3).
- AUX Input: Use a 3.5mm audio cable to connect external audio devices (TV, CD player, phone) to the AUX input jacks.
- FM Radio: Extend the built-in telescopic antenna for optimal reception. Use the front-panel buttons to auto-scan or manually tune to FM stations.
4.4 Microphone Connection
- Plug microphones into the front-panel MIC1 and MIC2 jacks. Adjust the MIC VOL and ECHO controls for each channel to optimize vocal performance and avoid feedback.
5. Operation Instructions
5.1 Front Panel Controls
- Power Switch: Turns the amplifier on or off.
- Input Selector (MODE): Cycles through available input sources (BT, USB, SD, FM, AUX).
- Playback Controls: Buttons for play/pause, previous/next track, and FM auto-scan (CH+, CH-, AUTO).
- Volume Knob: Controls the overall audio output level (MIN to MAX).
- EQ Adjustments:
- TREBLE: Adjusts the high-frequency response.
- BASS: Adjusts the low-frequency response.
- Microphone Controls:
- MIC VOL: Adjusts the input volume for the connected microphones.
- ECHO: Adjusts the reverb effect for vocal enhancement.
- Digital Display: Shows current input source, FM frequency, and playback status.
5.2 Basic Operation Steps
- Connect all necessary cables (power, speakers, audio sources, microphones) and ensure they are secure.
- Turn on the power switch. The amplifier will initialize, and the display will activate.
- Select your desired input source using the MODE button.
- Gradually increase the master volume to a comfortable listening level.
- Adjust the TREBLE, BASS, and microphone controls to optimize the audio output.
- When using a microphone, adjust the MIC VOL and ECHO knobs to avoid feedback and ensure clear vocal reproduction.
- When finished, lower the master volume to the minimum, turn off the power switch, and disconnect the power cord.
6. Safety & Maintenance
- Operating Environment: Use the amplifier in a well-ventilated area away from direct sunlight, moisture, heat sources, and excessive dust.
- Overload Protection: Avoid operating the amplifier at maximum volume for extended periods to prevent overheating and component damage.
- Cleaning: Use a dry, soft cloth to wipe the exterior. Do not use liquid cleaners or aerosols directly on the unit.
- Antenna Care: Extend the FM antenna fully for optimal reception. Avoid bending or damaging the antenna.
- Emergency Procedures: If you notice unusual smells, smoke, or noises, immediately turn off the power and disconnect the cord. Do not attempt to repair the unit yourself; contact authorized service personnel.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output | Power not connected, incorrect input source, loose speaker connections | Check power cord, select correct input, re-secure speaker cables |
| Bluetooth connection failure | Device out of range, Bluetooth disabled, signal interference | Move closer, enable Bluetooth, reduce interference from other devices |
| Microphone feedback | Volume too high, microphone too close to speakers | Lower mic volume, reposition microphone away from speakers |
| Poor FM reception | Antenna not extended, weak signal | Extend the antenna, adjust the amplifier's position |
| Distorted audio | Overloaded input, incorrect EQ settings | Reduce input level, reset EQ to default settings |
8. User Tips
- Always start with the volume at a low level and gradually increase it to prevent sudden loud noises and potential speaker damage.
- Experiment with the Treble and Bass EQ controls to find the sound profile that best suits your audio content and listening environment.
- For optimal stereo imaging, ensure your left and right speakers are positioned symmetrically relative to your listening position.
- Keep the remote control accessible for convenient adjustments from a distance, especially when using the FM radio or multimedia playback features.
- When using microphones for karaoke, adjust the ECHO effect to add depth to your vocals, but avoid excessive echo which can make speech unclear.
9. Packaging Contents
The package includes the following items:
- Sunbuck AV-660BT 2-channel amplifier ×1
- Remote control ×1
- Power cord ×1
- User manual ×1
- Warranty card ×1
10. Warranty Information
This product is covered by a manufacturer's warranty against defects in materials and workmanship for a period of 12 months from the date of purchase. For warranty claims, please contact the official customer service center with your purchase receipt and product details.