1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your F&D F3333U 5.1 Multimedia Speaker System. Please read this manual thoroughly before using the product to ensure proper function and to prevent damage. Keep this manual for future reference.
2. Safety Information
- Power Source: Connect the speaker system only to the specified AC power source as indicated on the product label.
- Ventilation: Ensure adequate ventilation around the subwoofer and satellite speakers. Do not block any ventilation openings.
- Water and Moisture: Do not expose the system to water, rain, or excessive moisture. Avoid placing liquid-filled objects on or near the speakers.
- Heat Sources: Keep the system away from heat sources such as radiators, heat registers, stoves, or other heat-producing appliances.
- Cleaning: Unplug the system from the power outlet before cleaning. Use a dry, soft cloth for cleaning. Do not use liquid cleaners or aerosol cleaners.
- Servicing: Do not attempt to service this product yourself. Refer all servicing to qualified service personnel.
- Children: Keep small parts and packaging materials away from children to prevent choking hazards.
3. Package Contents
Verify that all items listed below are present in your package:
- 1 x Subwoofer unit
- 5 x Satellite speakers
- 1 x Remote control
- 1 x Audio input cable (RCA to 3.5mm)
- 1 x User Manual (this document)
- Speaker connection cables
4. Product Overview
The F&D F3333U is a 5.1 multimedia speaker system designed to deliver immersive surround sound. It consists of a central subwoofer and five satellite speakers, controlled by a wireless remote.

Figure 1: F&D F3333U 5.1 Multimedia Speaker System. This image displays the central subwoofer unit, five compact satellite speakers, and the included remote control, illustrating the complete system layout.
4.1 Subwoofer Unit
The subwoofer houses the main amplifier, power supply, and controls. It provides deep bass frequencies for a rich audio experience. The front panel includes input selection, volume controls, and a display. The rear panel features speaker output terminals and audio input ports.
4.2 Satellite Speakers
The five satellite speakers are responsible for mid-range and high-frequency audio, creating the surround sound effect. They are compact and designed for flexible placement.
4.3 Remote Control
The wireless remote control allows convenient adjustment of volume, input source, FM radio functions, and playback controls from a distance.
5. Setup
5.1 Speaker Placement
Optimal speaker placement is crucial for achieving the best surround sound experience.
- Subwoofer: Place the subwoofer on the floor, preferably in a corner or near a wall, to enhance bass response.
- Front Speakers (Left, Right, Center): Position the front left and right speakers equidistant from your listening position, forming an equilateral triangle with the center speaker placed directly in front of you, above or below your display.
- Rear Speakers (Left, Right): Place the rear left and right speakers behind your listening position, slightly to the sides, at ear level or slightly above.
5.2 Connecting Speakers to Subwoofer
Connect each satellite speaker to the corresponding output terminal on the rear of the subwoofer. Ensure correct polarity (positive to positive, negative to negative) for each connection.
- Identify the speaker cables for each satellite.
- Match the speaker cables to the labeled output terminals on the subwoofer (e.g., Front L, Front R, Center, Surround L, Surround R).
- Securely insert the bare wire ends into the terminals.
5.3 Connecting to Audio Sources
The F3333U supports multiple audio input methods:
- AUX Input: Use the provided RCA to 3.5mm cable to connect to devices with a 3.5mm audio output (e.g., smartphones, laptops, MP3 players). Connect the 3.5mm jack to your device and the RCA plugs to the AUX input on the subwoofer.
- PC/DVD 5.1 Input: For true 5.1 surround sound from a PC or DVD player, use three stereo 3.5mm to RCA cables (not all included) to connect the corresponding audio outputs from your source device to the 5.1 input ports on the subwoofer.
- USB/SD Card: Insert a USB flash drive or SD card into the respective slot on the subwoofer for direct media playback.
- Bluetooth: Pair your Bluetooth-enabled device with the speaker system for wireless audio streaming.
5.4 Power Connection
After all audio connections are made, plug the subwoofer's power cord into a suitable AC power outlet. Turn on the main power switch located on the rear of the subwoofer.
6. Operation
6.1 Basic Controls
- Power On/Off: Press the Power button on the remote or the front panel of the subwoofer to turn the system on or off (standby mode). Use the rear switch for complete power off.
- Volume Control: Use the Volume +/- buttons on the remote or the rotary knob on the subwoofer to adjust the master volume.
- Input Selection: Press the "Input" button on the remote or front panel to cycle through available input sources: AUX, FM, USB, SD, Bluetooth.
6.2 FM Radio Operation
- Switch the input source to FM mode.
- Press the "Auto Scan" button on the remote to automatically search and save available FM stations.
- Use the "Previous" and "Next" buttons to navigate through saved stations.
6.3 USB/SD Card Playback
- Insert a USB flash drive or SD card (formatted to FAT/FAT32) into the corresponding slot.
- The system will automatically switch to USB/SD mode and begin playback. If not, select USB/SD input manually.
- Use the Play/Pause, Previous, and Next buttons on the remote to control playback.
6.4 Bluetooth Pairing
- Switch the input source to Bluetooth mode. The display will show "BT" or a similar indicator, and the system will enter pairing mode.
- On your Bluetooth-enabled device, search for available devices.
- Select "F&D F3333U" (or similar name) from the list to pair.
- Once paired, you can stream audio wirelessly from your device to the speaker system.
6.5 Remote Control Functions
The remote control provides access to all system functions. Refer to the remote control diagram (not provided, but implied) for specific button layouts.
- Power On/Off
- Volume Up/Down
- Input Source Selection (AUX, FM, USB, SD, Bluetooth)
- Mute
- Play/Pause, Previous/Next Track (for USB/SD/Bluetooth)
- FM Auto Scan, Channel Up/Down
- Individual Speaker Volume Adjustment (if supported by model)
7. Maintenance
- Cleaning: Use a soft, dry cloth to wipe the surfaces of the speakers and subwoofer. Do not use abrasive cleaners, waxes, or solvents.
- Dust: Regularly dust the speaker grilles and vents to prevent accumulation that could affect performance.
- Storage: If storing the system for an extended period, unplug it from the power outlet and store it in a cool, dry place, away from direct sunlight and extreme temperatures.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected; Power switch off; Power outlet faulty. | Ensure power cord is securely plugged in; Turn on the main power switch; Test the power outlet with another device. |
| No sound | Incorrect input source; Volume too low; Audio cables not connected properly; Mute function active. | Select the correct input source; Increase volume; Check all audio cable connections; Deactivate mute. |
| Distorted sound | Volume too high; Poor audio source quality; Incorrect cable connection. | Reduce volume; Try a different audio source; Recheck audio cable connections. |
| Remote control not working | Batteries depleted; Obstruction between remote and subwoofer; Remote sensor blocked. | Replace batteries; Remove any obstructions; Ensure remote sensor on subwoofer is clear. |
| USB/SD playback issues | Incorrect file format; USB/SD card not formatted to FAT/FAT32; Corrupted files. | Ensure audio files are supported; Format USB/SD card to FAT/FAT32; Try different files or media. |
| Bluetooth pairing failure | Device not in pairing mode; Speaker system not in Bluetooth mode; Device too far. | Ensure both devices are in pairing mode; Select Bluetooth input on speakers; Move devices closer. |
9. Specifications
| Model Name | F3333U |
| Speaker Type | Satellite, Surround Sound |
| Surround Sound Channel Configuration | 5.1 |
| Connectivity Technology | Bluetooth |
| Power Source | AC |
| Control Method | Remote |
| Compatible Devices | Most Common Electronic Devices (Smartphones, Tablets, Televisions, Computers) |
| Recommended Uses | Home Entertainment Systems, Computer Speakers |
| Material | Metal |
| Item Weight | 8.2 kg (18.08 Pounds) |
| Package Dimensions | 43.94 x 37.85 x 35.81 cm |
| Manufacturer | F&D |
10. Warranty and Support
This F&D F3333U 5.1 Multimedia Speaker System comes with a 1 Year Warranty from the date of purchase. Please retain your purchase receipt as proof of purchase for warranty claims.
For technical support, service, or warranty inquiries, please contact F&D customer service through their official website or the contact information provided with your product packaging. Do not attempt to repair the product yourself, as this may void your warranty.
For more information, visit the official F&D website: www.fenda.com





