*Note: It should be emphasized that 300W refers to the maximum power supported by the product's chip, which can only be achieved with a 48V 10A power supply. The power supply's voltage and current determine the amplifier's maximum output. For more details, please refer to the illustration below on Power Variability.

1. Check Connections & Device Compatibility: (1)Ensure all audio cables are fully inserted and undamaged. Replace any frayed cables with high-quality shielded ones(recommended: cables with metal connectors). (2)Confirm your speakers' power rating(e.g., 50W/100W) and impedance(e.g., 4Ω/8Ω) match the amplifier's requirements(see product manual).(3)Avoid raising the volume beyond your speakers' labeled maximum(e.g., “Max 80%") to prevent distortion.

2. Optimize Setup & Audio Sources: (1)Speaker Upgrade: Use high-resolution speakers placed at least 30cm away from walls or corners. Add rugs or curtains to reduce echoes. (2) Audio Quality: Play lossless music formats(e.g., FLAC, WAV) on dedicated devices(e.g., music players or updated phones/computers).(3) EQ Adjustment: Reset the equalizer to the neutral(flat) position initially. Adjust bass/treble gradually(like adjustments to 50% of the scale).

3. Reduce Environmental Interference:

(1) Anti-Interference Cables: Use shielded RCA cables with grounding(metal-shell connectors) to minimize buzzing.

(2) Distance from Interference: Keep audio/Bluetooth cables ≥30cm away from routers, power outlets, or microwaves.

(3) Troubleshoot Sources: Test the same song on another phone/computer. If the noise persists, contact support for a replacement.

Note: This product is designed to prioritize Bluetooth over RCA when both are connected and doesn't support dual-input playback simultaneously.

Bluetooth amp stereo

Fosi Audio BT20A Pro 600W TPA3255 Bluetooth 2.0 CH Amplifier

Bluetooth Transmission Format: SBC/AAC

Unique Design for Sound Control

Full-range Pre-Out Output

Texas Instrument TPA3255 Chip

Achieve a Distinct and Exceptional Sound Quality

High Precision and Stability Inductance Values

Friendly Solutions Guide