| Max SPL | 138 dB |
| Low frequency limit | 29 Hz |
| Transducers | LF: 1 x 21" |
| Weight | 49 kg / 108 lb |
| Directivity | standard or cardioid configurations |
High power compact subwoofer: 1 x 21"
amplified by LA4X / LA8 / LA12X
| Low frequency limit (-10 dB) | 29 Hz ([KS21_60]) |
| Maximum SPL1 | 138 dB ([KS21_100]) |
| Nominal directivity (-6 dB) | Standard or cardioid configuration |
| Transducers | 1 × 21″ neodymium cone driver |
| Acoustical load | bass-reflex, L-Vents |
| Nominal impedance | 8 Ω |
1 Peak level at 1 m under half space conditions using pink noise with crest factor 4 (preset specified in brackets).
| Connectors | 2 × 4-point terminal block with push-in connection |
| Rigging and handling | external rigging kits |
| Weight (net) | 49 kg / 108 lb |
| Cabinet | premium grade Baltic beech and birch plywood |
| Front | Coated steel grill |
| Rigging components | high grade steel with anti-corrosion coating |
| Finish | dark grey brown Pantone 426 C |
| IP | IP55 |
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