Mackie THUMP18SV4 18" Powered Subwoofer

The Mackie THUMP18SV4 is an 18" powered subwoofer built on decades of professional audio engineering. It pairs a 1400W Class-D amplifier with a high-performance woofer to extend low-frequency response down to 25 Hz, delivering 132 dB maximum SPL. This unit suits touring musicians, venue installers, and producers requiring serious bass reinforcement without sacrificing portability–at 31.9 kg with built-in handles, it balances durability against practicality.

The subwoofer's signal path includes stereo XLR inputs for mixer or controller connection, plus selectable high-pass modes (140 Hz for Thump12v4, 110 Hz for Thump15v4, 150 Hz for Thump GO, or variable manual crossover). All modes include 1.4 ms alignment delay to phase-align with paired loudspeakers. A phase invert switch, defeatable front LED, stereo/mono summing, and variable level control (muted to +6 dB) allow fine-tuning to any room or rig configuration. Full-range XLR outputs permit daisy-chaining multiple units.

The cabinet measures 541 mm tall by 630 mm wide by 605 mm deep, featuring an M20 threaded insert for optional pole mounting with the Mackie SPM400 speaker pole. Rugged construction and modern industrial styling withstand roadwork. Stack a Thump v4 loudspeaker above the subwoofer to create a vertically integrated PA system that maximises throw while preserving floor space for performers or crowds.