Look at tech specs on the Piega web site it is right there:
Model C 8 LTD
Definition 3-Wege-Standlautsprecher
Koaxial-System
Recommended amplifier output 20 - 250 Watt
Sensivity 89 dB/W/m
Impedance 4 Ohm
Frequency range 28 Hz - 50 kHz +/- 2 dB
Tolerance > pair < 0.5 dB
Driver(s) 3 18cm C1-Bass
1 C-2 Koaxial Bändchensystem
Dimensions (HxWxD) 102 x 27 x 43 cm
Weight 40 kg
Cabinet finish Gehäuse Metall geschliffen
Lochgitter silber
Model C 8 LTD
Definition 3-Wege-Standlautsprecher
Koaxial-System
Recommended amplifier output 20 - 250 Watt
Sensivity 89 dB/W/m
Impedance 4 Ohm
Frequency range 28 Hz - 50 kHz +/- 2 dB
Tolerance > pair < 0.5 dB
Driver(s) 3 18cm C1-Bass
1 C-2 Koaxial Bändchensystem
Dimensions (HxWxD) 102 x 27 x 43 cm
Weight 40 kg
Cabinet finish Gehäuse Metall geschliffen
Lochgitter silber