1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your AV-326BT / AV-999BT Professional 2-Channel Mini Audio Stereo Amplifier. Please read this manual thoroughly before use and retain it for future reference.
Safety Precautions
- Ensure the amplifier is connected to the correct power supply voltage (110V or 220V) as indicated on the unit.
- Do not expose the unit to rain, moisture, or extreme temperatures.
- Do not open the amplifier casing; refer all servicing to qualified personnel.
- Ensure proper ventilation around the unit to prevent overheating.
2. Product Overview
The AV-326BT / AV-999BT is a versatile 2-channel mini audio stereo amplifier designed for both home and auto use. It features multiple input options, including Bluetooth, USB, SD card, and microphone inputs, along with a built-in equalizer for sound customization.
Front Panel Controls and Connections
This image displays the various knobs, sliders, and ports on the front of the amplifier, including microphone inputs, volume controls, EQ sliders, and media playback controls.
A broader view of the amplifier's front, highlighting its compact design and comprehensive control interface.
Key Controls:
- POWER Switch: Turns the amplifier On/Off.
- MIC1, MIC2, MIC3, MIC4: Microphone input jacks.
- MIC1.2VOL, MIC3.4VOL: Volume controls for microphone inputs.
- TREBLE, MID, BASS (Microphone): Tone controls for microphone audio.
- ECHO, DELAY: Effects controls for microphone audio.
- EQ Sliders: Graphic equalizer for fine-tuning audio frequencies for Left and Right channels.
- MIC VOL: Master microphone volume.
- MUSIC VOL: Master music volume.
- INPUT: Selector for audio sources (MP3/FM A/B, USB, SD MMC CARD).
- LED DISPLAY: Shows current mode, track number, or FM frequency.
- USB Port: For USB flash drives.
- SD MMC CARD Slot: For SD/MMC memory cards.
- Control Buttons (IR, CH-, CH+, AUTO, REPEAT, MODE): For media playback and FM radio control.
- TREBLE, BASS, BALANCE (Music): Tone and balance controls for music playback.
Rear Panel Connections
Note: A specific image of the rear panel for the AV-326BT / AV-999BT model was not provided. Please refer to the general connection diagram below for typical amplifier rear panel layouts.
Typical rear panel connections include:
- Speaker Outputs: Terminals for connecting passive speakers (Left and Right channels).
- Audio Inputs (RCA): For connecting external audio sources like CD players, DVD players, or other devices.
- Power Input: For connecting the AC power cord.
- Antenna Terminal: For FM radio antenna.
3. Setup Instructions
- Unpacking: Carefully remove the amplifier from its packaging. Inspect for any signs of damage.
- Placement: Place the amplifier on a stable, flat surface. Ensure adequate ventilation around the unit to prevent overheating. Avoid placing it near heat sources or in direct sunlight.
- Speaker Connection:
- Connect your passive speakers to the "Speaker Output" terminals on the rear of the amplifier.
- Ensure correct polarity (+ to + and - to -) for each speaker to avoid phase issues.
- Use appropriate gauge speaker wire for optimal performance.
Figure 3.1: Amplifier connected to speakers. This image illustrates the amplifier set up with two external speakers, ready for audio playback.
- Audio Source Connection:
- External Devices (e.g., CD/DVD Player): Connect the audio output of your device to the "Audio Input (RCA)" jacks on the rear of the amplifier using RCA cables.
- USB/SD Card: Insert a USB flash drive into the USB port or an SD/MMC card into the card slot on the front panel.
- Microphone Connection:
- Plug your microphones into the MIC1, MIC2, MIC3, or MIC4 input jacks on the front panel.
- Power Connection:
- Connect the power cord to the amplifier's power input and then to a suitable wall outlet. Ensure the voltage matches your unit (e.g., 110V for US, 220V for EU/UK).
4. Operating Instructions
- Power On: Flip the "POWER" switch to the ON position. The LED display will illuminate.
- Select Input Source: Use the "INPUT" button or "MODE" button (for digital sources) to select your desired audio source (e.g., Bluetooth, USB, SD, FM, or external RCA input).
- Adjust Music Volume: Rotate the "MUSIC VOL" knob to set the overall music volume.
- Adjust Music Tone: Use the "TREBLE", "BASS", and "BALANCE" knobs for music to fine-tune the sound to your preference. The graphic EQ sliders can also be used for more precise frequency adjustments for both left and right channels.
- Microphone Usage:
- Plug in your microphones.
- Adjust individual microphone volumes using "MIC1.2VOL" and "MIC3.4VOL".
- Adjust the master microphone volume with the "MIC VOL" knob.
- Apply "ECHO" and "DELAY" effects as desired.
- Use the microphone "TREBLE", "MID", and "BASS" knobs to adjust microphone tone.
- Bluetooth Pairing:
- Select "Bluetooth" mode using the "MODE" button. The LED display will show "BT".
- On your mobile device, search for Bluetooth devices and select "AV-326BT" or "AV-999BT" to pair.
- Once paired, you can stream audio wirelessly to the amplifier.
- USB/SD Card Playback:
- Insert your USB drive or SD card. The amplifier should automatically switch to USB/SD mode and begin playback.
- Use the control buttons (CH-, CH+, PLAY/PAUSE, REPEAT) to navigate tracks and control playback.
- FM Radio Operation:
- Select "FM" mode using the "MODE" button.
- Press "AUTO" to automatically scan and save available radio stations.
- Use "CH-" and "CH+" to manually tune or select saved stations.
This video shows the amplifier's LED display, EQ adjustments, and the movement of speaker cones during audio playback, demonstrating its functionality.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or aerosols.
- Ventilation: Regularly check that the ventilation openings are not blocked by dust or debris.
- Storage: If storing the unit for an extended period, disconnect it from power and store it in a cool, dry place.
- Power Cord: Inspect the power cord periodically for any damage. If damaged, replace it with an approved cord.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected; Power switch off; Outlet not working. | Ensure power cord is securely connected; Turn power switch ON; Test outlet with another device. |
| No sound output | Volume too low; Incorrect input selected; Speakers not connected or faulty; Audio source issue. | Increase MUSIC VOL; Select correct INPUT; Check speaker connections and test speakers; Verify audio source is playing. |
| Bluetooth connection fails | Amplifier not in Bluetooth mode; Device too far; Device already paired with another unit. | Ensure amplifier is in "BT" mode; Move device closer; Disconnect from other Bluetooth devices and try again. |
| Distorted sound | Volume too high; Incorrect EQ settings; Faulty audio source or cables. | Reduce volume; Adjust EQ sliders; Test with a different audio source or cables. |
| Microphone not working | Microphone volume too low; Microphone not connected properly; Microphone faulty. | Increase MIC VOL and individual MIC VOLs; Check microphone connection; Test with another microphone. |
7. Specifications
| Feature | Detail |
|---|---|
| Model | AV-326BT / AV-999BT |
| Type | Professional Power Amplifier |
| Channels | 2 (2.0 Stereo) |
| Output Power | 300W + 300W |
| Material | Metal |
| Weight | 4 kg |
| Dimensions (L x W x H) | 38 cm x 35 cm x 15 cm |
| Power Input Options | US 110V, UK, EU 220V (variant dependent) |
| Connectivity | Bluetooth, USB, SD/MMC Card, Microphone Inputs, RCA Audio Inputs |
| Features | Built-in EQ, FM Radio, Echo/Delay Effects for Microphones |
| Certification | CE |
| Origin | Mainland China |
8. User Tips
- Equalizer Adjustment: Experiment with the graphic equalizer sliders to find the perfect sound profile for your music genre or listening environment. Small adjustments can make a big difference.
- Microphone Echo: When using microphones for karaoke or announcements, start with low echo and delay settings and gradually increase them to avoid feedback or an overly reverberant sound.
- Bluetooth Range: For stable Bluetooth connection, keep your paired device within a reasonable range (typically up to 10 meters) and avoid obstacles that might interfere with the signal.
- Speaker Matching: Ensure your speakers' impedance and power handling capabilities are compatible with the amplifier's output to prevent damage and ensure optimal sound quality.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
This product is certified with CE standards.
