The integrated Fosi BT30D PRO amplifier features two sets of passive speaker outputs and one set of passive subwoofer outputs, making it easy to set up a 2.1 home theater or other stereo Hi-Fi audio systems. Equipped with two high-quality Texas Instruments TPA3255 Class-D amplifier chips, the Bluetooth amplifier delivers clear and pure sound without distortion or clipping at a stable output of up to 165 W x 2 + 350 W power. Whether you are a gamer, movie enthusiast, or music lover, this amplifier provides tight, smooth, and naturally sounding bass. It has two dedicated controls for subwoofer management: the SUB FREQ control allows for precise frequency adjustment of passive subwoofers from 0 to 300 Hz, while the SUB VOL control lets you set the desired volume. This gives you full control over the bass output to suit your personal preferences and listening environment.