K-Array Thunder KS4PW I – White Passive Dual 18-Inch Subwoofer

Product Overview

The K-Array Thunder KS4PW I is a white passive dual 18-inch subwoofer designed for architectural AV installations where low-frequency hardware must match light interiors instead of hiding in black. This white installation subwoofer delivers 141 dB maximum SPL with extension down to 30 Hz, anchoring column array systems in houses of worship, auditoriums, and design-led commercial venues. Its passive 4-ohm, 2800 W peak architecture keeps amplification centralized in the rack, simplifying commissioning and service for commercial AV integrators. The same cabinet is available as the black Thunder KS4P I.

Product Description

Inside the white polyurea-coated birch plywood enclosure sit two long-excursion 18-inch neodymium magnet woofers with 3-inch voice coils, producing response from 30 Hz to a crossover-dependent 150/450 Hz upper limit. The factory white finish — with custom RAL colors available — lets the cabinet sit in plain view beneath white Kayman columns in sanctuaries, lobbies, and performance rooms without disrupting the interior design. Two SpeakON NL4 connectors accept amplifier signal over 2-wire or 4-wire cable and pass signal through to additional loudspeakers, keeping multi-cabinet wiring simple. Neodymium motors hold the dual-18 cabinet to 53.2 kg, easing handling during installation, while the polyurea coating protects the finish from scuffs and environmental stress over years of service. Driven by K-Array Kommander amplification, DSP presets manage the low-pass crossover for accurate integration with K-Array column elements such as the white Kayman KY102W-EBS, and optional adapters let a column stand directly on top for a matched full-range ground stack.

Key Features

• White Architectural Finish — The factory white cabinet matches light interiors and white K-Array columns, with custom RAL options for exact color specifications.
• Dual 18-Inch Neodymium Woofers — Two long-excursion 18" drivers with 3" voice coils extend bass response down to 30 Hz for full-bandwidth commercial systems.
• 141 dB Maximum SPL — High output keeps low-frequency reinforcement strong and consistent in large rooms and high-energy program material.
• 2800 W Peak Power Handling at 4 Ohms — The passive design accepts high-output professional amplification and supports centralized amp-rack system architectures.
• Dual SpeakON NL4 Connectivity — Two NL4 connectors take 2-wire or 4-wire input and route signal through to additional loudspeakers for clean multi-cabinet installs.
• DSP-Managed Crossover — With matched K-Array processing, a preset-dependent 150 Hz low pass integrates the subwoofer accurately with column array elements.
• Durable Polyurea-Coated Plywood — The coated birch enclosure resists wear and environmental stress, protecting the white finish in busy commercial spaces.
• Lightweight Dual-18 Cabinet — At 53.2 kg (117.3 lb), neodymium motors make positioning and rigging easier than conventional dual-18 enclosures.

Typical Applications

• Houses of worship with light interiors needing full-range reinforcement that matches the architecture
• Auditoriums pairing white column arrays with visually consistent low-frequency cabinets
• Multi-purpose rooms hosting speech, music, and video events in design-sensitive spaces
• All-hands rooms and commercial meeting spaces specifying white AV equipment throughout
• Broadcast studios where set design calls for white-finished reinforcement equipment

Technical Specifications

Frequently Asked Questions

What amplification does the KS4PW I require?

The KS4PW I is passive and needs external amplification rated for a 4-ohm load with up to 2800 W peak handling. K-Array Kommander amplifiers are the recommended match because their DSP presets manage the low-pass crossover, though other professional amplifiers with adequate power and processing also work.

Will the white finish hold up in high-traffic spaces?

Yes. The birch plywood enclosure carries a polyurea coating that resists scuffs, impacts, and environmental stress, protecting the white finish in lobbies, sanctuaries, and event spaces.

How does it pair with white K-Array columns?

The KS4PW I is the visual and acoustic match for white Kayman columns; optional K-Array adapters allow a column to stand directly on top of the cabinet, creating a coherent white full-range ground stack for design-led rooms.

Can multiple subwoofers be daisy-chained?

Yes. The dual SpeakON NL4 connectors accept signal input and pass it through to additional loudspeakers, so multiple cabinets wire in series without separate distribution panels.

Does the system support commercial control integration?

When powered by K-Array Kommander electronics, the system integrates with Q-SYS, Crestron, Control4, Symetrix, and other control platforms, with Dante networking available on supported amplifiers for networked commercial AV deployments.

What warranty is included?

K-Array provides a 5-year manufacturer warranty, with Creation Networks supporting the process as an authorized dealer. Browse companion products in our K-Array collection.