Mackie THUMP18SV4 18" Powered Subwoofer

Mackie's Thump18SV4 is an 18" powered subwoofer engineered to deliver authoritative low-end extension for touring and installed PA rigs. Built on decades of professional audio refinement, the unit pairs a 1400W Class-D amplifier with a high-performance woofer capable of reaching 25 Hz and generating 132 dB maximum SPL. The design philosophy prioritises reliability and portability–essential for gigging musicians and engineers who demand consistent sub-bass performance night after night.

Construction centres on a lightweight yet rugged cabinet (70.4 lb, 21.3" tall) equipped with built-in handles for practical transport. Connectivity includes stereo XLR inputs for mixer or controller sources, plus stereo XLR high-pass outputs with four selectable crossover modes: dedicated settings for Thump12V4, Thump15V4, and Thump GO loudspeakers, plus a variable mode for manual crossover adjustment. Additional controls encompass phase invert, defeatable LED, adjustable output level (–muted to +6 dB), and 1.4 ms alignment delay across all modes. Full-range XLR outputs enable daisy-chaining multiple units. An M20 thread accommodates the Mackie SPM400 speaker pole for vertical stacking.

The Thump18SV4 integrates readily into existing Thump-series PA systems or functions as a standalone sub for any mid-to-large venue setup. Its variable crossover mode removes compatibility constraints, allowing seamless integration with third-party loudspeakers when needed. Stereo-to-mono summing capabilities support both single and dual-subwoofer configurations, giving sound engineers flexibility in system architecture for different room sizes and acoustic demands.

Features

• 1400W Class-D amplifier delivering 132 dB maximum SPL output
• 18" high-performance woofer with 25 Hz low-frequency extension
• Four selectable high-pass modes: Thump 12, Thump 15, Thump GO, and variable
• Stereo XLR inputs and high-pass outputs with 1.4 ms alignment delay
• Phase invert switch and defeatable front LED for operator control
• Adjustable output level ranging from muted to +6 dB
• Lightweight rugged construction: 70.4 lb with built-in transport handles
• M20 thread compatibility with Mackie SPM400 speaker pole for stacking