Low frequency limit (-10 dB): 29 Hz ([KS21_60])
Maximum SPL: 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
Weight (net): 49 kg / 108 lb