The F1 subwoofer is a compact bass module designed for use with the F1 Model 812 loudspeaker. Its powerful amplifier and dual drivers produce bass as much as subs nearly double its size.The F1 subwoofer features:2 X 10" high-excursion drivers1000 watts2 x input channel with XLR, 1/4" combo connector2 x XLR balanced line outPolarity reverse switchHPF enable