L-Acoustics KS21i High Power Compact Subwoofer 1x21-Inch

KS21i is a compact reference subwoofer designed to extend the bandwidth of A15i and A10i systems in installation applications. KS21i features one high excursion, direct-radiating 21'' transducer mounted in a bass-reflex tuned enclosure. KS21i couples with A15i and A10i to reinforce contour and extend bandwidth to 29 Hz and 31 Hz respectively. KS21i features L-Vents that substantially reduce turbulence and port noise at high levels while also increasing LF efficiency. The association of modern components and laminar vents greatly improves short-term SPL compared to similar-sized subwoofers. The KS21i frequency response is optimized to couple perfectly with both A Series install systems. KS21i can be flown and stacked in combination with A15i or A10i to form a full range line source. KS21i can be deployed in standard or cardioid configurations with dedicated presets, for flown and stacked deployment.

Specifications:

• Description: High power compact subwoofer: 1 × 21" amplified by LA2Xi2 / LA4X / LA8 / LA12X
• Low frequency limit (-10 dB): 29 Hz ((KS21_60))
• Maximum SPL: 138 dB ((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:
  • 4-point terminal block with push-in connection
  • Connector sealing plate with cable gland
• Rigging and handling:
  • external rigging kits
  • M6 inserts for rigging plates and accessories
  • M8 inserts for A-U15i
• Safety: 1 DIN580-compatible M8 threaded insert
• Weight (net): 46 kg / 101 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
  • Pure white RAL 9010
  • Custom RAL code on special order
• IP: IP55