LDZS AV-326BT 2-Channel Sound Quality Power Amplifier User Manual

1. Product Overview

The LDZS AV-326BT is a versatile 2-channel power amplifier designed for high-quality sound reproduction in various settings, including home audio, car audio, and KTV applications. It features multiple input options, comprehensive sound control, and robust power output.

Key Features:

• 2-Channel Stereo Output
• Integrated Equalizer (EQ)
• MP3 Playback with Remote Control
• Reverberation, Fine Tuning, and Balance Controls
• SD Card and USB Interface for Media Playback
• Bluetooth 5.0 Connectivity
• FM Radio Functionality
• LED Display
• Dual Power Input: DC12V and AC 110V/220V/240V
• Four Microphone Inputs with Reverb and Delay Adjustment
• 5-Band EQ Mixer Function

Figure 1: LDZS AV-326BT Amplifier Front View

2. Package Contents

Please check the box for the following items:

• LDZS AV-326BT Power Amplifier
• Remote Control
• Audio Cable (RCA type)
• User Manual
• Power Cord (AC)

Figure 2: What's in the Box

3. Setup Instructions

3.1 Front Panel Controls

Figure 3: Front Panel Layout

1. Microphone Plugs (1, 2, 3, 4): Connect your microphones here.
2. Microphone 1-2 Volume Control: Adjusts the volume for MIC1 and MIC2.
3. Microphone Treble Adjustment: Adjusts the high frequencies for microphones.
4. Microphone Midrange Adjustment: Adjusts the mid frequencies for microphones.
5. Microphone Bass Adjustment: Adjusts the low frequencies for microphones.
6. SD Card Slot: Insert an SD card for media playback.
7. Display: Shows current mode, track information, etc.
8. USB Port: Connect a USB drive for media playback.
9. Microphone Volume Control: Master volume for all microphones.
10. MP3 Signal and A/B Group Signal Conversion: Selects input source.
11. Volume Control (Music): Master volume for music playback.
12. Equalizer Balance Adjustment: Adjusts the balance of the 5-band equalizer.
13. Microphone Delay Time Adjustment: Controls the delay effect for microphones.
14. Volume Balance: Adjusts the left/right channel balance.
15. Microphone Echo Adjustment: Controls the echo effect for microphones.
16. Music Bass Adjustment: Adjusts the low frequencies for music.
17. Microphone 3-4 Volume Adjustment: Adjusts the volume for MIC3 and MIC4.
18. Music Bass Adjustment: Adjusts the low frequencies for music.
19. Power Switch: Turns the amplifier ON/OFF.

3.2 Rear Panel Connections

Figure 4: Rear Panel Connections

1. Audio Input (RCA): Connect external audio sources (e.g., CD player, TV).
2. Line Output (RCA): Connect to another amplifier or recording device.
3. FM Antenna: Connect the included FM antenna for radio reception.
4. Right Channel Speaker Output: Connect the right speaker.
5. Left Channel Speaker Output: Connect the left speaker.
6. DC 12V Input (-): Negative terminal for DC 12V power supply.
7. DC 12V Input (+): Positive terminal for DC 12V power supply.
8. AC 220V Power Input: Connect the AC power cord (supports 110V/220V/240V).

3.3 Connection Steps

1. Speakers: Connect your passive speakers to the Left and Right Channel Speaker Outputs (4 & 5) on the rear panel. Ensure correct polarity (+ to + and - to -).
2. Audio Source: Connect your desired audio source (e.g., smartphone, TV, DVD player) to the Audio Input (1) using RCA cables.
3. Microphones: If using microphones, plug them into the Microphone Plugs (1-4) on the front panel.
4. FM Antenna: Connect the FM antenna to the dedicated port (3) for radio functionality.
5. Power: Connect the power cord to the AC 220V Power Input (8) or use a DC 12V power supply to the DC 12V Inputs (6 & 7) if using a 12V source (e.g., car battery). Ensure the power switch (19) is in the OFF position before connecting power.

4. Operating Instructions

4.1 Power On/Off

Press the Power Switch (19) on the front panel to turn the amplifier ON or OFF.

4.2 Input Selection

Use the buttons near the LED display or the remote control to select your desired input source (USB, SD, Bluetooth, FM Radio, or Audio Input).

4.3 Music Playback

• USB/SD Playback: Insert a USB drive or SD card into the respective ports (6 & 8). The amplifier will automatically detect and play compatible audio files. Use the playback controls (play/pause, next/previous, repeat) on the front panel or remote.
• Bluetooth: Select Bluetooth input. The LED display will indicate pairing mode. Search for "AV-326BT" on your device and pair. Once connected, play audio from your device.
• FM Radio: Select FM input. Use the tuning buttons to scan for stations.
• External Audio: Select the appropriate audio input source.

Adjust the Music Volume Control (11) to your desired listening level.

4.4 Microphone Usage (Karaoke)

Figure 5: Supports 4 Microphones

• Connect up to four microphones to the Microphone Plugs (1-4).
• Adjust individual microphone volumes using Microphone 1-2 Volume Control (2) and Microphone 3-4 Volume Adjustment (17).
• Use the Microphone Volume Control (9) for overall microphone volume.
• Fine-tune microphone sound with Treble (3), Midrange (4), and Bass (5) adjustments.
• Add effects using Microphone Echo Adjustment (15) and Microphone Delay Time Adjustment (13).

4.5 Sound Adjustment (EQ)

Figure 6: Multiple EQ Controls

• Use the Equalizer Balance Adjustment (12) to fine-tune the 5-band graphic equalizer for optimal sound.
• Adjust Music Bass Adjustment (16 & 18) for low-frequency response.
• Use the Volume Balance (14) to adjust the left and right channel output balance.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the amplifier's exterior. Do not use liquid cleaners or abrasive materials.
• Ventilation: Ensure adequate ventilation around the amplifier. Do not block the ventilation openings.
• Storage: Store the amplifier in a cool, dry place away from direct sunlight, high temperatures, and humidity.
• Power: Disconnect the power cord from the wall outlet if the unit will not be used for an extended period.

6. Troubleshooting

No Sound Output:

• Check if the amplifier is powered on.
• Ensure all audio cables are securely connected to the correct input/output ports.
• Verify that the correct input source is selected (USB, SD, Bluetooth, FM, Audio Input).
• Check the Music Volume Control (11) and ensure it is not at minimum.
• Confirm speakers are properly connected and functional.

Distorted Sound:

• Reduce the input volume from your audio source.
• Adjust the Music Volume Control (11) to a lower level.
• Check the EQ settings (12, 16, 18) and reset them to a neutral position if necessary.
• Ensure speaker impedance is within the recommended range (4-16Ω).

Microphone Issues:

• Ensure microphones are securely plugged in.
• Adjust Microphone Volume Controls (2, 9, 17).
• Check microphone Treble, Midrange, and Bass adjustments (3, 4, 5).
• If echo/delay is excessive, adjust Microphone Echo Adjustment (15) and Microphone Delay Time Adjustment (13).

Bluetooth Connectivity Problems:

• Ensure the amplifier is in Bluetooth mode.
• Make sure your device's Bluetooth is enabled and within range (typically 10 meters).
• Forget the device from your phone's Bluetooth settings and try pairing again.

FM Radio Poor Reception:

• Extend and adjust the position of the FM antenna (3) for better signal.
• Try moving the amplifier to a different location.

7. Specifications

8. User Tips

• For optimal sound quality, ensure your speakers are matched to the amplifier's impedance range (4-16Ω).
• When using microphones, experiment with the Echo and Delay controls to find the best effect for your voice and room acoustics.
• Utilize the 5-band EQ to tailor the sound profile to your personal preference or the genre of music you are listening to.
• Keep the remote control handy for convenient adjustments from a distance.
• If experiencing interference with FM radio, try repositioning the antenna or the amplifier itself.

9. Warranty and Support

For warranty information and technical support, please refer to the contact details provided by your retailer or the manufacturer. Keep your purchase receipt as proof of purchase.