This high-output active subwoofer features an 18-inch DVX woofer driven by a powerful 1800-watt Class-D amplifier. Its integrated FIR-Drive DSP technology allows for extensive control over system performance, including cardioid presets for directional bass output. The tour-grade, 13-ply birch plywood enclosure is durable and includes removable casters for portability. With flexible connectivity and multiple low-pass frequency settings, the ETX-18SP-US provides superior low-frequency performance for a wide range of professional sound reinforcement applications.