AV-628BT 5-Channel HIFI Amplifier Instruction Manual

1. Introduction

Thank you for choosing the AV-628BT 5-Channel HIFI Amplifier. This powerful digital stereo audio amplifier is designed to deliver high-fidelity sound for your home entertainment system. Featuring Bluetooth connectivity, USB and SD card playback, FM radio, and karaoke functions with reverb, it offers versatile audio options. Please read this manual carefully before operating the device to ensure proper use and optimal performance.

Figure 1: Front view of the AV-628BT Amplifier

2. Package Contents

Please check the package for the following items:

• AV-628BT 5-Channel HIFI Amplifier
• Remote Control
• User Manual (this document)
• Power Cable (AC 220V)

Figure 2: Amplifier packaging with included accessories

3. Setup Instructions

3.1 Placement

Place the amplifier on a stable, flat surface with adequate ventilation. Avoid placing it near heat sources or in direct sunlight.

3.2 Speaker Connection

The AV-628BT amplifier supports a rated impedance of 4-16Ω. Connect your speakers to the 'SPEAKER OUTPUT' terminals on the rear panel. Ensure correct polarity (positive to positive, negative to negative) for each speaker.

Figure 3: Rear panel connections

3.3 Audio Source Connection

Connect your audio sources to the 'AUDIO INPUT' (AUX1, AUX2, LINE) RCA terminals on the rear panel. These inputs are suitable for devices such as computers, MP3 players, DVD players, or CD players. For TV audio amplification, connect your TV's audio output to one of these AUX inputs.

3.4 Power Connection

Ensure the amplifier's power switch is in the 'OFF' position. Connect the supplied power cable to the AC 220V power input on the rear panel and then plug it into a suitable wall outlet.

4. Operating Instructions

4.1 Power On/Off

Press the 'POWER' button on the front panel to turn the amplifier on or off.

4.2 Input Selection

Use the 'MODE' button on the front panel or remote control to cycle through available input sources: Bluetooth, USB, SD Card, AUX (Line In), and FM Radio.

Figure 4: Front panel controls

4.3 Volume and Tone Controls

• VOLUME: Adjust the master volume using the large knob on the front panel.
• BASS/TREBLE: Use these knobs to adjust the low and high frequencies of the audio output.
• BALANCE: Adjust the left/right channel balance.
• LOUDNESS: Engages a contour filter to boost bass and treble at low volume levels.

4.4 Bluetooth Operation

1. Select 'Bluetooth' mode using the 'MODE' button. The display will show 'BLUE'.
2. On your mobile device, enable Bluetooth and search for available devices.
3. Select 'AV-628BT' from the list to pair.
4. Once paired, you can stream audio from your device to the amplifier.

Figure 5: Bluetooth mode display

4.5 USB/SD Card Playback

1. Insert a USB drive or SD card (containing audio files) into the respective slot on the front panel.
2. Select 'USB' or 'CARD' mode using the 'MODE' button.
3. The amplifier will automatically detect and play audio files. Use the playback controls (Play/Pause, Next, Previous) on the front panel or remote.

4.6 FM Radio Operation

1. Select 'FM' mode using the 'MODE' button. The display will show the frequency.
2. Use the tuning buttons (usually 'Next'/'Previous' or dedicated tuning buttons) to scan for stations.
3. To save a station, refer to the remote control instructions for specific 'Memory' or 'Save' functions. The amplifier supports programming and saving FM radio stations to its memory.

Figure 6: FM radio mode display

4.7 Karaoke Function

The amplifier features two microphone inputs (MIC1, MIC2) on the front panel. Adjust microphone volume ('MIC VOL'), bass ('M BASS'), treble ('M TREBLE'), and echo ('ECHO') using the dedicated knobs for an enhanced karaoke experience.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the amplifier's exterior. Do not use liquid cleaners or solvents.
• Ventilation: Ensure the ventilation slots on the top and sides of the amplifier are not blocked to prevent overheating.
• Storage: If storing the amplifier for an extended period, disconnect it from power and store it in a cool, dry place.

6. Troubleshooting

• No Power: Check the power cable connection and the wall outlet. Ensure the power switch is ON.
• No Sound: Verify speaker connections and polarity. Check the selected input source and volume levels. Ensure audio source is playing.
• Bluetooth Not Connecting: Make sure the amplifier is in Bluetooth mode ('BLUE' displayed). Ensure your device's Bluetooth is on and within range. Try unpairing and re-pairing.
• USB/SD Card Not Playing: Ensure the USB drive/SD card is inserted correctly and contains compatible audio files. Try re-inserting or using a different drive/card.
• FM Radio Poor Reception: Extend the FM antenna fully. Try repositioning the amplifier for better signal.

7. Specifications

Figure 7: Amplifier dimensions

8. User Tips

• For optimal sound, ensure your speakers have an impedance between 4-16Ω.
• When connecting multiple audio sources, use the AUX inputs on the rear panel for devices like computers, MP3 players, DVDs, or CDs.
• Utilize the built-in FM radio and karaoke functions for versatile entertainment options.

9. Frequently Asked Questions (FAQ)

Q: Can FM radio stations be programmed and recorded in the amplifier's memory?

A: Yes, the amplifier supports programming and saving FM radio stations to its memory for quick access. Refer to the remote control instructions for specific 'Memory' or 'Save' functions.

Q: Can this amplifier be used to amplify the audio of a television?

A: Yes, the amplifier can be used to amplify TV audio by connecting the TV's audio output (e.g., RCA stereo output) to one of the amplifier's AUX inputs (AUX1, AUX2, or LINE) on the rear panel.

10. Warranty and Support

For warranty information and technical support, please refer to the seller's policies or contact the point of purchase. Keep your purchase receipt as proof of purchase.