Hi-Fi Amp with Clean Sound Quality: Fosi Audio M03 subwoofer amp adopts the Instruments TPA3255D2 chip, High Efficient Power Output Up to 200Watt, providing 150 watts RMS into 4-ohm loads or 120watts to 8-ohm loads. Great amplifier to driver any bookshelf speaker or subwoofer; Subwoofer amplifier and Full-Frequency Mono Amp: Switch to PBTL, it's a Full-Frequency Mono amp for driving passive speakers and powered subwoofer. Switch to SUB, it's a subwoofer amplifier for diving passive and powered subwoofers; Mini Compact but Powerful: Built-in low pass filter for 20-300Hz subwoofers with SUB frequency control, small simple compact design but practical and powerful; Home Hi-Fi amplifier: Exclusively designed for the customers who pursue HiFi sound; MAX Power Output:200Watt. Note: The package comes with a 32V/5A power supply, you need a more powerful power supply to get the MAX power output;