VQ1800D Professional Active 500 Watt 18" PA Subwoofer with Built-In Stereo Crossover * Professional 500-Watt powered subwoofer for PA applications * Powerful 18'' long-excursion transducer with high temperature voice coil provides incredibly accurate and pulse-pounding bass * Precise reproduction of ultra-low frequencies for "bulletproof" punch and impact * State-of-the-art 500-Watt Class-D amplifier with comprehensive over-excursion, thermal and clip limit protection * Built-in active stereo crossover provides high-pass filtered outputs for full-range loudspeakers * Precise reproduction of ultra-low frequencies for "bulletproof" punch and impact * State-of-the-art 500-Watt Class-D amplifier with comprehensive over-excursion, thermal and clip limit protection * Built-in active stereo crossover provides high-pass filtered outputs for full-range loudspeakers. Custom-Engineered Transducers Powerful, high-efficiency Class-D amplifiers and Switch Mode Power Supply technology coupled with state-of-the-art DSP functionality sure sounds impressive – but what about the part of the system you actually hear? Our LF transducers are designed specifically for each application – it’s what sets us apart from the competition. When you buy a BEHRINGER active subwoofer, you can rest assured that the transducer inside has been engineered to perform flawlessly with every other element for truly professional results. The VQ1800D active subwoofer is capable of extremely high sound pressure levels: 124 dB (Full Space, 1 W @ 1 m), with a frequency range of 40 - 200 Hz.