The Eurolive B1500XP from Behringer is an active powered subwoofer, which provides ample low frequency sound reinforcement by leveraging a 15" long-excursion TURBOSOUND woofer with 3000W of Class-D amplification to deliver a frequency response of 45 to 150 Hz (±3 dB).The subwoofer features balanced XLR inputs and outputs, as well as balanced XLR Thru jacks for connecting to additional speakers and building more powerful and complex systems. A boost frequency knob targets a boost frequency between 40 and 90 Hz and gives the target frequency a +10 dB boost. The unit also has a high cut dial that provides precise control over the upper corner frequency of the subwoofer's amplifier, without affecting the Thru signals. A level knob controls the input gain and a phase switch allows you to reverse the output phase to compensate for frequency cancellations between the subwoofer and satellite speakers.The subwoofer includes ergonomic handles for easy transport as well as a pole socket for mounting with commercial spacer poles. A rugged steel grill protects the speaker cone and an internal intelligent limiter ensures maximum sound performance and woofer protection. The B1500XP ships with a power cord.