DC resistance Rdc 3,4 Ω Nominal impedance ZN 4 Ω Resonance frequency fs 1000 HZ Voice coil diameter20 mm SPL 2,83V/1m 92,5 dBDome/Kalotte Fine cloth silkCut -off Frequency / Trennfrequenz> 3000 Hz 12 dB/Oct > 2000 Hz 18 dB/Oct