The Mackie THUMP18SV4 powered subwoofer reinforces the low end for live performances, DJ setups, and professional PA systems. Its Class-D amplifier delivers 1,400 W of power, and the 18″ woofer produces a maximum SPL of 132 dB, with low-frequency response down to 33 Hz.

The XLR inputs are stereo, while the XLR outputs provide High-Pass and Full-Range options for connecting additional speakers or subwoofers. Selectable High-Pass modes include settings for Thump12, Thump15, and Thump GO, as well as Variable mode with manual crossover adjustment. The cabinet features integrated handles and an M20 pole socket.

• Type: Powered PA subwoofer
• Color: Black
• Amplifier power: 1,400 W Class-D
• Woofer: 18″ high-performance
• Maximum sound pressure level: 132 dB SPL
• Low-frequency response: Down to 33 Hz
• High-Pass modes: Thump12 at 140 Hz, Thump15 at 110 Hz, Thump GO at 150 Hz, and Variable with manual crossover adjustment
• Alignment delay: 1.4 ms in all modes
• Inputs: Stereo XLR
• High-Pass outputs: Stereo XLR
• Full-Range outputs: Stereo XLR
• Channel summing: Stereo or mono
• Level adjustment: From mute to +6 dB
• Phase inversion: Switch
• Front LED: Can be disabled
• Speaker pole socket: M20
• Height: 541 mm
• Width: 630 mm
• Depth: 605 mm
• Weight: 31.9 kg