Behringer Eurolive VQ1500D, a professional active (powered) 15-inch PA subwoofer.
Power Output: 500 Watts of Class-D amplification.
Driver: 15-inch long-excursion transducer.
Crossover: Built-in stereo crossover to separate bass from mid/high frequencies
Input A & B: Two balanced XLR inputs to accept audio signals from a DJ mixer, PA mixer, or controller.
Thru A & B: Two balanced XLR outputs that send an unfiltered, full-range copy of the input signal to additional subwoofers or equipment.
Output A & B: Two balanced XLR outputs with a built-in high-pass filter. These send only the mid-to-high frequencies to your main top PA speakers