2.1channel power Bluetooth digital power amplifier board with fidelity sound quality Output power Left or right channel: 300W at 50V into 4 Ω; 160W at 50V into 8 Ω Subwoofer (maximum power): 600W at 50V into 2 Ω; 300W at 50V into 4 Ω; 160W at 50V into 8 Ω In short, the higher the voltage, the smaller the resistance, the greater the output power Voltage and supply Working voltage range: 18–50 V DC Maximum limit: 53 V Recommended DC power supply: 36–48 V and 12 A Construction and performance Developed with the latest materials to deliver a power Bluetooth digital power amplifier board 2.1channel configuration for integrated stereo plus subwoofer output Key benefits output capability for both main channels and subwoofer supports robust, clean sound in compact form Broad compatibility with common speaker impedances (2 Ω, 4 Ω, 8 Ω) across subwoofer and channels Flexible power options with a wide DC supply range and clear guidance on recommended voltage and current Bluetooth connectivity enables wireless streaming without additional digital adapters Use scenarios Home audio or home theater systems that require strong Bluetooth playback and a dedicated subwoofer channel DIY speaker builds, active speaker assemblies, or custom multimedia cabinets needing a 2.1channel amplifier Small venues or outdoor setups that require power amplification from a DC supply within the 36–48 V range and 12 A current Notes The specification indicates that output power scales with supply voltage and load impedance, as described above All values are stated for reference and should be verified under actual operating conditions with the chosen power supply and load configurations