Mackie Thump 18S V4

A Subwoofer Designed to Complement the Thump Family

The Thump18S V4 serves as the natural low-end reinforcement for Thump speakers: the idea is simple-delegate the infra and low spectrum to the subwoofer, allowing your main speakers to focus on the clarity of vocals, guitars, keyboards, and attacks. Thanks to its high-pass filtering modes adapted to different speaker sizes, it quickly delivers a coherent system with cleaner bass and a more comfortable headroom.

Who Benefits from the Thump18S V4 and in What Applications?

This 18-inch powered subwoofer targets mobile professionals and setups that need to "fill the room" without compromise: DJs, bands, event performances, multipurpose rooms, and small to medium stages. Whether you seek more breadth at moderate volume or greater acoustic pressure as the night progresses, it provides the necessary support to keep the kick punchy and the bass present-even when the audience absorbs part of the energy.
Its active format also simplifies setup: power the subwoofer, input via XLR, then send the signal out to your speakers. The result: less complexity, clean cabling, and quick adjustment before soundcheck.

Settings, Filtering, and Connectivity: Controlled Bass, Not Just Power

Class D Amplification and Deep Bass Extension

With Class D amplification and an 18-inch driver, the Thump18S V4 is designed to generate a massive low end while maintaining control. The specified response down to 25 Hz (at -10 dB) lets you feel the foundation in bass-heavy styles (electro, hip-hop, modern pop), and the maximum sound pressure level of 132 dB helps maintain headroom as the crowd fills the room.

High-Pass Filtering and Crossover: Perfect Match with Your Speakers

The Thump18S V4 offers an adjustable stereo filter with preset modes (Thump12, Thump15, ThumpGo) to automatically tailor system behavior according to the size of the connected speakers. If you use other speaker models, the variable mode allows manual crossover adjustment for better control over the transition between subwoofer and tops. This results in better-integrated bass, clearer sound, and less "boominess" in the low-mid range.

Phase, Mono/Stereo, and Routing: Adapt to the Venue

Depending on the subwoofer's placement (center, under stage, off to the side) and the room acoustics, phase coherence can vary. The built-in phase inversion helps restore tighter bass when the sum between subwoofer and speakers seems to cancel out. The mono or stereo operation mode facilitates adaptation to your source and configuration (small DJ set, live duo, mixing console broadcast).

XLR Inputs/Outputs: Simple, Clean, Efficient

The XLR connectivity is designed for direct integration into a sound system: two XLR inputs to receive your signal, then filtered XLR outputs to feed your speakers, as well as full-range XLR outputs when you need a wideband send. This routing keeps stage cabling clean and saves time during setup.

Technical specifications

Frequency response - start	28 Hz	Transport	2 handles
Frequency response - end	160 Hz	Inputs	2 x XLR
Category	Soundsystem	Outputs	2 filtered XLR, 2 unfiltered XLR
Type	active subwoofer	Number of inputs	2
Peak power	1400 W	Color	Black
Application	Facade	Power output	700 W
Controls	Crossover, phase inverter, input gain, logo illumination, mono/stereo	Power / type	RMS
Speaker diameter	18"	Weight	31.9 kg
Cut-off frequency	variable	Dimensions (mm)	541 x 630 x 605
SPL Max / peak	132 dB	Mic preamp	Yes
Speaker structure	Plywood

Power	700 W RMS	Operating mode	mono or stereo
Amplification type	Class D	Connectivity	2 XLR inputs, 2 filtered XLR outputs, 2 full-range XLR outputs
Max. SPL	132 dB	Power supply	universal regulated switch-mode power supply with power factor correction
Loudspeaker	18 inches	Pole mount	M20
Frequency response (-10 dB)	25 Hz - 160 Hz	Enclosure	plywood
Adjustable stereo crossover	Thump12, Thump15, ThumpGo, variable	Carrying handles	integrated
Phase inversion	yes	Dimensions (W x H x D)	541 x 630 x 605 mm