Introduction
The BT-198 (AV-198) is a versatile dual-channel household amplifier designed to enhance your audio experience. It supports multiple input sources including Bluetooth 5.0, USB drives, SD cards, FM radio, and traditional wired audio inputs. With 60W+60W stereo output and two microphone interfaces, it is suitable for various home entertainment and small event applications. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting.
Safety Information
- Ensure the amplifier is placed on a stable, flat surface away from direct sunlight, heat sources, and moisture.
- Do not block ventilation openings. Proper airflow is essential to prevent overheating.
- Use only the specified power adapter and voltage (12V DC or 220V AC).
- Do not open the amplifier casing. Refer all servicing to qualified personnel.
- Keep out of reach of children.
Product Overview
The BT-198 amplifier features a user-friendly front panel with various controls and input ports, and a rear panel for power and speaker connections.
Figure 1: Front Panel Controls and Inputs
Front Panel Features:
- POWER Switch: Turns the amplifier on or off.
- MIC INPUT (MIC1, MIC2): 6.35mm jacks for connecting microphones.
- MIC VOL: Adjusts microphone volume.
- ECHO: Controls the echo effect for microphones.
- TREBLE: Adjusts high-frequency audio levels.
- BASS: Adjusts low-frequency audio levels.
- VOLUME: Master volume control for overall audio output.
- USB/SD Card Interface: Ports for USB drives and SD cards.
- Display Screen: Shows current mode, track information, or FM frequency.
- MODE Button: Switches between input sources (Bluetooth, USB, SD, FM, Wired).
- RADIO CH-/CH+/AUTO: FM radio controls for channel selection and auto-scan.
- PREV/PLAY/PAUSE/NEXT: Media playback controls.
- REPT: Repeat playback function.
Figure 2: Rear Panel Power Inputs
Rear Panel Features:
- DC12V INPUT: For 12V DC power supply.
- AC220-240V 50Hz: For 220V AC power supply.
- L+/R-: Speaker output terminals.
- FM Antenna: Connection point for the FM radio antenna.
Setup
1. Power Connection
- Determine the appropriate power source: 12V DC or 220V AC.
- If using 220V AC, connect the provided power adapter to the AC input port on the rear panel and then to a wall outlet.
- If using 12V DC, connect a 12V DC power cable to the DC12V input port on the rear panel.
- Ensure the power switch on the front panel is in the 'OFF' position before connecting power.
Figure 3: Power Plug Types (US and EU shown)
2. Speaker Connection
- Connect your passive speakers to the L+ and R- terminals on the rear panel. Ensure correct polarity (positive to positive, negative to negative) for optimal sound quality.
3. FM Antenna Connection
- Connect the included FM antenna to the 'FM' port on the rear panel for improved radio reception. Extend the antenna for better signal.
Figure 4: FM Antenna Connection
4. Microphone Connection
- Plug your microphones into the MIC1 or MIC2 input jacks on the front panel.
Operating Instructions
1. Power On/Off
- Press the 'POWER' switch on the front panel to turn the amplifier on or off. The display screen will illuminate when powered on.
2. Selecting Input Mode
- Press the 'MODE' button on the front panel or the remote control to cycle through available input sources: Bluetooth, USB, SD Card, FM Radio, and Wired Input. The selected mode will be shown on the display.
3. Bluetooth Pairing
- Switch the amplifier to Bluetooth mode using the 'MODE' button. The display will show 'BT' and the Bluetooth indicator will blink.
- On your mobile phone, tablet, laptop, or other Bluetooth device, enable Bluetooth and search for available devices.
- Select 'LDZS' from the list of devices to connect. Once paired, the Bluetooth indicator on the amplifier will stop blinking.
- You can now play audio from your Bluetooth device through the amplifier.
Figure 5: Bluetooth Connection Guide
4. USB/SD Card Playback
- Insert a USB drive or SD card containing audio files (FLAC, WAV, APE, MP3) into the respective port on the front panel.
- Switch the amplifier to USB or SD mode using the 'MODE' button. The amplifier will automatically detect and begin playing audio files.
- Use the 'PREV', 'PLAY/PAUSE', 'NEXT', and 'REPT' buttons on the front panel or remote control to manage playback.
Figure 6: USB/SD Card Input
5. FM Radio Operation
- Switch the amplifier to FM radio mode using the 'MODE' button.
- Press the 'AUTO' button to perform an automatic scan for available radio stations. The amplifier will save detected stations.
- Use the 'CH-' and 'CH+' buttons to navigate through saved stations.
6. Microphone Usage
- After connecting microphones, adjust the 'MIC VOL' knob to control the microphone volume.
- Use the 'ECHO' knob to add or remove an echo effect to the microphone audio.
7. Audio Adjustment
- Turn the 'VOLUME' knob to adjust the overall output volume.
- Use the 'TREBLE' knob to adjust the high-frequency response of the audio.
- Use the 'BASS' knob to adjust the low-frequency response of the audio.
8. Remote Control
- The included remote control provides convenient access to all major functions, including power, mode selection, volume, track control, and FM radio tuning.
Figure 7: Amplifier with Remote Control
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or abrasive materials.
- Ventilation: Ensure that the ventilation slots are free from dust and obstructions to prevent overheating.
- Storage: When not in use for extended periods, store the amplifier in a cool, dry place.
- Power Off: Always turn off the amplifier and unplug it from the power source before cleaning or performing any maintenance.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable not connected; Power switch off; No power from outlet. | Check power cable connection; Ensure power switch is ON; Test outlet with another device. |
| No sound output | Volume too low; Incorrect input mode; Speaker cables loose; Mute activated. | Increase VOLUME; Select correct MODE; Check speaker connections; Ensure not muted. |
| Bluetooth not connecting | Amplifier not in BT mode; Device Bluetooth off; Incorrect device selected. | Switch to BT mode; Enable Bluetooth on device; Select 'LDZS' to pair. |
| USB/SD card not playing | Incorrect mode; Unsupported file format; Corrupted media. | Switch to USB/SD mode; Ensure files are FLAC, WAV, APE, MP3; Try another USB/SD card. |
| Poor FM radio reception | Antenna not connected/extended; Weak signal. | Connect and extend FM antenna; Try repositioning the antenna. |
| Remote control not working | Batteries dead/incorrectly inserted; Obstruction between remote and amplifier. | Replace batteries; Ensure clear line of sight to amplifier's IR receiver. |
Specifications
| Feature | Specification |
|---|---|
| Model | AV-198 |
| Amplifier Type | Hifi |
| Amplifier Power | 60W + 60W (Stereo Output) |
| Input Voltage | 12V DC / 220V AC |
| Channel | 2.0 |
| Bluetooth Version | 5.0 |
| Supported Audio Formats | FLAC, WAV, APE, MP3 (via USB/SD) |
| Microphone Interfaces | 2 |
| Material | Iron |
| Dimensions (L x W x H) | 12 cm x 5 cm x 2 cm (Approximate package dimensions, actual product may vary slightly) |
| Weight | 1.21 kg (Approximate package weight, actual product may vary slightly) |
User Tips
- Optimal Speaker Placement: For the best stereo sound, position your speakers equidistant from your listening position and angle them slightly inwards.
- Cable Management: Keep audio and power cables organized and separate to minimize interference and ensure a tidy setup.
- Microphone Feedback: If you experience microphone feedback (squealing), try reducing the MIC VOL, adjusting the ECHO, or moving the microphone further away from the speakers.
- Remote Control Range: Ensure there are no obstructions between the remote control and the amplifier's front panel for reliable operation.
- Lossless Audio: For the highest quality sound, use FLAC or WAV files on your USB/SD card.
Warranty and Support
For any questions, technical assistance, or warranty claims, please contact the seller or retailer from whom you purchased this product. Please retain your proof of purchase for warranty purposes.
