K-Array Thunder KS2P I – Passive 18-Inch Subwoofer (Black)

Product Overview

The K-Array Thunder KS2P I is a compact passive 18-inch subwoofer designed for commercial AV installations that need substantial low-frequency reinforcement from a manageable single-driver cabinet. This 8-ohm installation subwoofer delivers 137 dB maximum SPL with extension down to 35 Hz, supporting column array systems in houses of worship, auditoriums, and multi-purpose rooms. Its passive design with 1400 W peak power handling keeps amplification centralized in the rack, and the 8-ohm impedance lets integrators run two cabinets in parallel on a single 4-ohm amplifier channel. This is the black finish; a white KS2PW I version is also available.

Product Description

The KS2P I houses a long-excursion 18-inch neodymium magnet woofer with a 3-inch voice coil, producing response from 35 Hz to a crossover-dependent 150/450 Hz upper limit — the wide upper range gives system designers flexibility when crossing over to compact column elements. At 34 kg (75 lb) and 650 x 500 x 580 mm, it is among the easiest 18-inch installation subwoofers to position, hoist, and conceal, a direct benefit of its neodymium motor design. The birch plywood enclosure is finished in polyurea coating that resists impacts and wear through years of installed or portable service. Two SpeakON NL4 connectors accept 2-wire or 4-wire signal from external amplifiers and pass it through to other loudspeakers, and the 8-ohm nominal impedance makes paralleled dual-subwoofer configurations straightforward on professional amplifier channels. K-Array Kommander amplifiers are the recommended drive platform, applying DSP-controlled low-pass presets from 150 Hz up to 450 Hz to integrate the cabinet with Kayman, Python, and Kobra columns. Systems needing more output can step up to the 21-inch Thunder KS3P I or the dual-18 Thunder KS4P I.

Key Features

• 18-Inch Neodymium Woofer — A long-excursion 18" driver with 3" voice coil reaches down to 35 Hz for genuine low-frequency reinforcement in mid-size commercial venues.
• 137 dB Maximum SPL — Strong single-cabinet output covers worship services, presentations, and music playback without strain.
• 8-Ohm Impedance for Flexible Loading — Two KS2P I cabinets can run in parallel on one 4-ohm amplifier channel, reducing rack space and cost in dual-sub designs.
• 1400 W Peak Power Handling — The passive design accepts professional installation amplification while keeping all electronics serviceable at the rack.
• Wide Crossover Range — External DSP low-pass settings from 150 Hz up to 450 Hz give designers latitude when pairing with compact column and satellite speakers.
• Dual SpeakON NL4 Connectivity — Two NL4 connectors accept 2-wire or 4-wire input and route signal through to additional loudspeakers for clean daisy-chained wiring.
• Lightweight 34 kg Cabinet — Neodymium magnetics keep the cabinet at 75 lb, easing one- or two-person handling during installation.
• Polyurea-Coated Birch Plywood Enclosure — The coated cabinet shrugs off scuffs and impacts across years of fixed or portable duty.

Typical Applications

• Houses of worship adding low-frequency support beneath column arrays
• Auditoriums and lecture halls requiring music-capable reinforcement
• Multi-purpose rooms alternating between speech and full-range program
• All-hands rooms and commercial meeting spaces with video and music playback
• Training rooms and government spaces needing discreet, compact bass support

Technical Specifications

Frequently Asked Questions

Which amplifier should drive the Thunder KS2P I?

The KS2P I is passive and requires external amplification rated for an 8-ohm load with up to 1400 W peak handling. K-Array Kommander amplifiers are the recommended match because their DSP presets manage the low-pass crossover, though any professional amplifier with suitable power and processing works.

Can I run two KS2P I cabinets on one amplifier channel?

Yes. The 8-ohm nominal impedance allows two cabinets in parallel to present a 4-ohm load, which most professional installation amplifiers drive comfortably — a common approach for left-right subwoofer placement.

Which K-Array speakers pair with the KS2P I?

It is commonly deployed beneath K-Array column elements such as Kayman, Python, and Kobra, with crossover presets aligning the system. Browse companion elements in the K-Array collection.

Is it suitable for permanent installation?

Yes. The polyurea-coated birch plywood enclosure and custom RAL finish options are designed for fixed commercial installations as well as portable production use.

Does it integrate with AV control systems?

When driven by K-Array Kommander electronics, the system supports integration with Q-SYS, Crestron, Control4, and other commercial control platforms, plus Dante networking on supported amplifiers.

What warranty applies?

K-Array products carry a 5-year manufacturer warranty, supported by Creation Networks as an authorized dealer with system design assistance before and after the sale.