Description High power compact subwoofer: 1 × 21’’ amplified by LA4X / LA8 / LA12X Usable bandwidth (-10 dB) 31 Hz - 100 Hz ([KS21_100]) Maximum SPL1 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 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 kg / 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