L-Acoustics | KS21iW - Subwoofer: 1 x 21" White (install)

L-Acoustics | KS21iW - Subwoofer: 1 x 21" White (install)

The L-Acoustics KS21iW is the white version of the KS21i installation subwoofer: a compact loudspeaker with a single high-excursion 21" neodymium driver, designed to deliver deep, powerful low end in fixed installations. Its white finish allows the subwoofer to blend into bright architectural environments, making it an ideal choice where sound quality and visual integration go hand in hand, such as venues, theatres, houses of worship, museums, corporate spaces and entertainment locations.

Designed to extend the A Series install systems

The KS21iW is optimised to couple seamlessly with the A15i and A10i install loudspeakers. Together they reinforce the contour of the system and extend the low-frequency bandwidth, while the KS21iW can be flown or stacked alongside the A Series to form a full-range line source.

Clean, controlled low end

The bass-reflex enclosure features L-Vents™, laminar ports that significantly reduce turbulence and port noise at high levels while improving low-frequency efficiency. The result is a tight, articulate low end with strong short-term impact, well beyond what you would expect from a subwoofer of this size.

Standard or cardioid configurations

With dedicated presets, the KS21iW can be deployed in standard or cardioid configurations, for both flown and stacked setups. A cardioid arrangement reduces low-frequency energy towards the rear, which helps keep unwanted bass out of stages, back-of-house areas and adjacent spaces.

Built for installation

• White finish for discreet integration into bright interiors
• Premium Baltic birch and beech plywood enclosure
• Coated steel grille for durable protection
• Dedicated external rigging kits for flown or stacked installation
• Connector panel with push-in terminal block, designed for clean installation
• Weather-resistant construction, suited to demanding environments

Part of the L-Acoustics ecosystem

The KS21iW is driven and protected exclusively by L-Acoustics amplified controllers with dedicated presets, ensuring consistent performance and seamless integration with your L-Acoustics installation.

• Low frequency limit (-10 dB): 29 Hz (KS21_60)
• Maximum SPL: 138 dB (KS21_100) with LA2Xi (bridge mode) / LA4X / LA8 / LA12X; 131 dB (KS21_100) with LA2Xi
• Nominal directivity (-6 dB): Standard or cardioid configuration
• Transducers: 1 × 21″ neodymium cone driver
• Acoustical load: Bass-reflex, L-Vents
• Nominal impedance: 8 Ω
• Connectors: 1 × 4-point terminal block with push-in connection
• Rigging and handling: External rigging kits; M6 inserts for rigging plates; M8 inserts for A-U15i; 1 DIN580-compatible M8 threaded insert
• Dimensions (H × W × D): 752 × 569 × 629 mm (29.6 × 22.4 × 24.8 in)
• Weight (net): 46 kg (101 lb)
• Cabinet: Premium grade Baltic beech and birch plywood
• Front: Coated steel grill; acoustically neutral 3D fabric
• Finish: Dark grey brown, Pantone 426 C; pure white, RAL 9010; custom RAL code on special order
• IP rating: IP55