K-Array Rumble KU44 I – Ultra-Slim Stainless Steel Passive Subwoofer (Black)

Product Overview

The K-Array Rumble KU44 I is an ultra-slim stainless steel passive subwoofer that adds controlled low-frequency reinforcement to installations where the loudspeakers must remain nearly invisible. Only about 4 inches tall and deep across its 19.7-inch width, this slim installation subwoofer houses two 4-inch neodymium woofers and two 4-inch passive radiators, reaching 116 dB peak SPL with response extending to 45 Hz. Selectable 8/32-ohm impedance makes it a practical compact subwoofer for distributed audio systems in boardrooms, conference rooms, and architectural commercial spaces. This is the black finish; a white KU44W I version is also available.

Product Description

The KU44 I is the slimmest member of K-Array's Rumble subwoofer family, designed to mount along walls, under seating, behind millwork, or beside line arrays of K-Array mid-high elements without drawing attention. Its two long-excursion 4-inch drivers are tuned for maximum linear excursion and minimum residual noise, while the passive radiators replace a reflex port so the stainless steel enclosure stays sealed against dust, sand, and moisture. That sealed steel construction carries an IP54 rating, and a marine version with enhanced anti-corrosion treatment (IP64, with further protection via the K-KUIP4 cover) serves yachts, beach clubs, and exposed outdoor installations. The double voice coil offers selectable 8-ohm or 32-ohm operation, so integrators can parallel multiple cabinets on a single amplifier channel across distributed zones, and a dedicated preset in K-Array amplifiers such as the Kommander KA04 manages crossover and limiting automatically. K-Array pairs the KU44 I with compact mid-high speakers such as the Vyper and KZ14 for full-range systems, and the K-WF44 accessory flush-mounts the cabinet into a wall. For Azimut KAMUT2L system builds requiring 2-ohm operation, see the Rumble KU44-2.

Key Features

• Ultra-Slim 500 x 116 x 101 mm Profile — The roughly 4-inch-deep cabinet disappears along walls, under seats, behind displays, and beside line arrays where conventional subwoofers cannot fit.
• Dual 4-Inch Woofers with Dual Passive Radiators — Neodymium drivers engineered for maximum linear excursion deliver bass extension to 45 Hz with minimum residual noise.
• 116 dB Peak SPL Output — Output capability supports foreground music and speech reinforcement in small to mid-size commercial rooms.
• Selectable 8/32 Ohm Impedance — The double voice coil lets integrators parallel multiple cabinets per amplifier channel for efficient distributed wiring.
• Sealed Stainless Steel Construction — The IP54-rated enclosure resists dust and water; a marine version with IP64 rating and anti-corrosion treatment is available.
• Dedicated K-Array Amplifier Preset — Factory presets handle the 150 Hz low-pass crossover, EQ, and limiting when driven by Kommander amplifiers.
• Matched Mid-High Pairing — The KU44 I completes full-range systems with K-Array Vyper and KZ14 compact loudspeakers.
• Extensive Mounting Hardware — K-WALL2 wall brackets, K-PMOUNT pole adapter, K-KCLAMP truss clamps, K-FOOT3 stand adapter, and the K-WF44 in-wall flush-mount cover permanent and portable installs.
• Finish Options — Black, white, custom RAL, and premium custom finishes match architectural requirements.

Typical Applications

• Boardrooms and conference rooms needing concealed program bass
• Commercial meeting spaces with strict aesthetic requirements
• Houses of worship adding low-frequency support to discreet line arrays
• Broadcast studios requiring compact, low-profile bass elements
• Auditoriums and multi-purpose rooms with architectural audio systems
• Government spaces where loudspeakers must remain unobtrusive

Technical Specifications

Frequently Asked Questions

Which amplifier should drive the Rumble KU44 I?

The KU44 I is passive and requires an external amplifier with a low-pass crossover at approximately 150 Hz. K-Array Kommander amplifiers, including the KA04, carry a dedicated KU44 preset that manages crossover, EQ, and limiting automatically.

What is the difference between the KU44 I and the KU44-2?

The KU44 I offers selectable 8/32-ohm impedance for general installation and distributed systems. The KU44-2 is a 2-ohm version configured for K-Array's Azimut KAMUT2L system and its KA02 amplifier.

Which K-Array speakers pair with the KU44 I?

K-Array matches the KU44 I with compact mid-high loudspeakers such as the Vyper line array element and KZ14, completing a discreet full-range system. Browse companion models in the K-Array collection.

Can the KU44 I be installed outdoors?

Yes. The sealed stainless steel enclosure is IP54 rated, and a marine version with enhanced anti-corrosion treatment carries an IP64 rating, with further water protection available via the K-KUIP4 accessory for coastal and poolside installations.

Can the KU44 I be flush-mounted in a wall?

Yes. The K-WF44 accessory family (black, white, custom RAL, and premium finishes) recesses the cabinet into a wall cavity for fully concealed low-frequency reinforcement.

What warranty applies?

K-Array products carry a 5-year manufacturer warranty, backed by Creation Networks as an authorized dealer with commercial AV design support.