Bose Stage Subwoofer (731444-1110) 1,000 watts of power packing all the performance of a larger bass box into a more compact design thats lighter and easier to carry Line output EQ can be set to a high-pass filter or full range, allowing for easy crossover selection when used with a main loudspeaker Two 10-inch high-excursion drivers built into a compact enclosure thats light and easy to transport F1 Model 812 extension bracket integrated into the subwoofer can be raised and lowered, allowing the F1 Model 812 Flexible Array loudspeaker to be safely mounted on the subwoofer, eliminating the need for a conventional pole mount or tripod stand Polarity switch with selections for NORM and REV. Reversing polarity allows for easy correction of low-frequency overlap between the main loudspeaker and subwoofer