RMS power handling: 200 Watts Max. power handling: 400 Watts Impedance: 4 Ohms Resonance frequency: 45 Hz Sensitivity: SPL 89 dB Voice coil diameter: 37 mm VAS: 24 Liter Mechanical Q factor: 12,14 Electrical Q factor: 0.61 Total Q factor: 0.58 Installation diameter / depth: 191 mm / 92 mm Made in Germany.