F&D A521
F&D A521 2.1 Channel USB Speaker User Manual
Model: A521 | Brand: F&D
1. Introducció
This user manual provides detailed instructions for the setup, operation, and maintenance of your F&D A521 2.1 Channel USB Speaker system. Please read this manual thoroughly before using the product to ensure proper functionality and to prevent damage.
The F&D A521 is a 16 Watt 2.1 channel speaker system designed to deliver clear audio with strong bass, featuring USB/SD card playback and a wooden cabinet for enhanced sound quality.
2. Informació de seguretat
Always adhere to the following safety guidelines to prevent electric shock, fire, or damage to the unit:
- No exposeu la unitat a la pluja o la humitat.
- Do not open the speaker cabinet. Refer all servicing to qualified personnel.
- Assegureu-vos que hi hagi una ventilació adequada al voltant dels altaveus.
- Desconnecteu el cable d'alimentació durant tempestes amb llamps o quan no l'utilitzeu durant períodes prolongats.
- Mantenir allunyat de fonts de calor i llum solar directa.
3. Contingut del paquet
Si us plau, comproveu el paquet per veure si hi ha els elements següents:
- 1 x F&D A521 Subwoofer Unit
- 2 altaveus satèl·lit
- 1 x Audio Input Cable (RCA to 3.5mm or RCA to RCA, depending on model variant)
- 1 x Manual d'usuari (aquest document)
4. Producte acabatview
The F&D A521 speaker system consists of a main subwoofer unit and two satellite speakers.

Figure 4.1: F&D A521 2.1 Channel USB Speaker System, showing the subwoofer and two satellite speakers.

Figura 4.2: posterior view of the F&D A521 subwoofer, highlighting the control panel with volume, bass, audio input/output, USB, and SD card slots.

Figura 4.3: Detallada view of the USB and SD card reader slots located on the F&D A521 subwoofer's side panel.
5. Instruccions de configuració
- Col·locació: Place the subwoofer on a stable, flat surface. Position the satellite speakers equidistant from your listening position for optimal stereo separation.
- Connecteu els altaveus satèl·lit: Connect the cables from the two satellite speakers to the "AUDIO OUTPUT" ports on the rear panel of the subwoofer. Ensure correct polarity (red to red, black to black).

Figura 5.1: posterior view of the F&D A521 satellite speakers, showing the speaker wire connection point.
- Connecta la font d'àudio: Connect your audio source (e.g., PC, TV, MP3 player) to the "AUDIO INPUT" ports on the rear panel of the subwoofer using the provided audio cable.
- Connexió d'alimentació: Plug the power cord into a suitable AC power outlet. The system features a built-in Automatic Voltage Regulator (AVR) for a wide main operating voltage gamma.
- Encès: Turn on the power switch located on the rear panel of the subwoofer.
6. Instruccions de funcionament
6.1 Funcionament bàsic
- Control de volum: Use the "VOLUME" knob on the rear panel of the subwoofer to adjust the overall sound level.
- Control de baix: Use the "BASS" knob to adjust the bass intensity.
6.2 Reproducció des de targeta USB/SD
The F&D A521 supports MP3/WMA dual formats decoding from USB drives and SD cards.
- Insert a USB drive or SD card into the respective slot on the subwoofer's side panel.
- The system will automatically switch to USB/SD mode and begin playback.
- Use the "Play/Pause", "Next", and "Previous" buttons located near the USB/SD slots for media control.
7. Característiques clau
- Built-in AVR (Automatic Voltage Regulator) for wide main operating voltage gamma.
- USB/SD reader supporting MP3/WMA dual formats decoding.
- Wooden cabinet construction for strong and low distortion bass.
- High efficient energy saving design for low power consumption.
- Dedicated Play/Pause, Next, Previous buttons for USB/SD reader control.
- 6.5-inch bass driver for the subwoofer.
8. Especificacions
| Característica | Especificació |
|---|---|
| Marca | F&D |
| Nom del model | A521 |
| Tipus d'altaveu | Subwoofer |
| Configuració del canal de so envoltant | 2.1 |
| Potència de sortida màxima dels altaveus | 16 watts |
| Wattage | 52.00 W |
| Tecnologia de connectivitat | USB, per cable |
| Protocol de connectivitat | USB |
| Audio Input Compatible With | Auxiliar |
| Dispositius compatibles | Reproductor MP3, Telèfon intel·ligent, Tauleta, Televisió |
| Material | Fusta |
| Color | Negre |
| Pes de l'article | 5 kg 420 g (11.95 lliures) |
| Dimensions del paquet | 43.4 x 29.6 x 29.4 cm |
| Mètode de control | Touch (for USB/SD controls) |
| Mida del controlador d'àudio | 6.5 Inches (Bass Driver) |
9. Manteniment
- Neteja: Use a soft, dry cloth to clean the speaker surfaces. Do not use liquid cleaners or aerosols.
- Emmagatzematge: Si guardeu la unitat durant un període prolongat, desconnecteu-la de l'alimentació i guardeu-la en un lloc fresc i sec.
- Ventilació: Assegureu-vos que les obertures de ventilació no estiguin bloquejades.
10. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Sense so | Power not connected; Volume too low; Incorrect audio input connection; Audio source issue. | Check power cord and switch; Increase volume; Ensure audio cables are securely connected to correct input; Test with another audio source. |
| So distorsionat | Volume too high; Audio source distortion; Incorrect bass setting. | Reduce volume; Check audio source output; Adjust bass knob. |
| La reproducció per USB/SD no funciona | Sense suport file format; USB drive/SD card not inserted correctly; Corrupted media. | Assegureu-vos files are MP3/WMA; Reinsert media; Try a different USB drive/SD card. |
11. Garantia i Suport
The F&D A521 2.1 Channel USB Speaker comes with a 1 anys de garantia des de la data de compra. Si us plau, conserveu el rebut de compra per a reclamacions de garantia.
For technical support or warranty service, please contact F&D customer service through their official weblloc o centres de servei autoritzats.
Note: The warranty does not cover damage caused by misuse, accident, unauthorized modification, or improper installation.
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