L-Acoustics KS21 Compact Subwoofer

21" transducer - 2-point integrated rigging system - 138 dB Max SPL

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  • L-Acoustics KS21
  • 5-year Limited Warranty


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L-Acoustics KS21 (LAC-KS21) is a compact reference subwoofer designed to extend the bandwidth of A15 and A10 systems. KS21 features one high excursion, direct radiating 21" transducer mounted in a bass-reflex tuned enclosure, and operates from 29 ㎐ to 60 ㎐ when associated with A15, or 30 ㎐ to 100 ㎐ when associated with A10. This sub deploys in standard or cardioid setups with dedicated presets, and features a two-point, integrated rigging system that is compatible with A15. Combinations of KS21 and A15 can be flown or stacked to form a full range line source, and the KS21 also integrates a threaded insert for pole-mounting of A15 or A10.

  • High power compact reference 21″ subwoofer
  • Exceptional impact
  • Augmented short-term SPL
  • Lightweight (49㎏ / 108 lbs)
  • Simple, fast, integral rigging

Specifications for the L-Acoustics KS21

{ "Description" : { "High power compact subwoofer" : "1 × 21’’ amplified by LA4X / LA8 / LA12X", "Low frequency limit (-10㏈)" : "29 ㎐ ([KS21_60])", "Maximum SPL" : "138㏈ ([KS21_100])" }, "Nominal directivity" : "Standard or cardioid configurations", "Transducers" : "1 × 21’’ neodymium cone driver", "Acoustical load" : "Bass-reflex, L-Vents", "Nominal impedance" : "8 Ω", "Connectors" : { "IN" : "1 × 4-point speakON", "LINK" : "1 × 4-point speakON" }, "Rigging and handling" : [ "Flush-fitting two-point rigging system", "1 pole mount with M20 x 150 insert", "4 handles, 8 corner stops and 2 ground runners" ], "Weight (net)" : "49㎏ / 108 lb", "Cabinet" : "Premium grade Baltic beech and birch plywood", "Front" : [ "Coated steel grill", "Acoustically neutral 3D fabric" ], "Rigging components" : "High grade steel with anti-corrosion coating", "Finish" : "Dark grey brown Pantone 426 C", "IP" : "IP55" }

Research Materials for L-Acoustics KS21 (LAC-KS21)

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KS21 (LAC-KS21) Specifications

KS21 (LAC-KS21) User Guide

KS21 (LAC-KS21) Drawing

L-Acoustics Products Weather Protection

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