The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. hero-video Merchant Video The upgraded version of Fosi Audio BT20A Fosi Audio BT20A Pro 600W TPA3255 Bluetooth 2.0 CH Amplifier Input: Bluetooth + RCA; Output: Passive Speakers + Pre-outTHD: ≤ 0.005%; SNR: ≥108dB; MAX Output Power: 300Wx2@4Ω （Using a 48V10A Power Supply） *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. Previous page Bluetooth Distance: ≥15m Bluetooth Transmission Format: SBC/AAC Note: The amp prioritizes Bluetooth and doesn't support simultaneous RCA and Bluetooth input. Unique Design for Sound Control Experience the authentic sound without any added effects by adjusting them to their middle points. Full-range Pre-Out Output Easily connect to a powered subwoofer, speaker, or another amplifier for versatile audio options. Next page 1 Bluetooth 5.0 2 Treble/Bass Control 3 PRE-OUT Previous page Next page 1 Power Variability 2 Back Side 3 Front Side Previous page Texas Instrument TPA3255 Chip Has a unique smart algorithm that optimizes the output stage for max efficiency and min distortion. Upgrade Audio Performance Achieve a Distinct and Exceptional Sound Quality The two plug-in NE5532 Op-Amps can be replaced by LME49720HA/MUSES02/OPA2134PA Op-Amps, etc. High Precision and Stability Inductance Values Low DC resistance and excellent frequency characteristics which improve performance Next page 1 TPA3255 CHIP 2 Replaceable OP CHIP 3 High Power Inductors Friendly Solutions Guide 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. Quick Tips: - Using a turntable? Ensure it has a built-in phono preamp or connect an external one(required for proper volume). - Is Bluetooth unstable? Check if the antenna is securely installed and keep it away from other wireless devices(e.g., Wi-Fi routers). BT20A PRO Comparison Chart Bluetooth 2.0 CH Amp Type Bluetooth 4.1 CH Amp 300W x 2 MAX Power Output 30w*4+60W*1 Bluetooth + RCA Input BT + 3.5mm AUX + OPT Passive SPK +Pre-out Output Pre-Out+SPK Out Treble&Bass Control ≤ 0.005% THD ≤ 0.03% ≥108dB SNR ≥88dB Bluetooth 2.0 CH Amp Type Bluetooth 2.1 CH Amp 300W x 2 MAX Power Output 165W x 2 + 350W @ 4Ω Bluetooth + RCA Input BT+RCA+COA+OPT+USB Passive SPK +Pre-out Output SPK/SUB/PRE OUT Treble&Bass Control ≤ 0.005% THD ≤0.03% ≥108dB SNR ≥100dB Bluetooth 2.0 CH Amp Type 2.0 CH Amp 300W x 2 MAX Power Output 300W x 2 Bluetooth + RCA Input RCA Passive SPK +Pre-out Output Passive SPK +Pre-out Treble&Bass Control ≤ 0.005% THD <0.003% ≥108dB SNR ≥110dB Bluetooth 2.0 CH Amp Type Headphone Amp+Preamp 300W x 2 MAX Power Output - Bluetooth + RCA Input Bluetooth + RCA Passive SPK +Pre-out Output RCA+Headphone+AUX Treble&Bass Control ≤ 0.005% THD ≤ 0.02% ≥108dB SNR ≥103dB Previous page HT4S Learn More MC351 Learn More V3 Learn More P3 Learn More Next page