The F1 subwoofer is a compact bass module designed for use with the F1 Model 812 loudspeaker. Its powerful amplifier and dual drivers produce as much bass as subs nearly double its size.The F1 subwoofer features:Two 25.4-cm high-excursion drivers1000 wattsTwo input channel with XLR, 6.35-mm combo connectorTwo XLR balanced line outPolarity reverse switchHPF enable