13 WS Features:
 

Subwoofer 13 cm "W"

Frequency response (+/- 3 dB): 36 Hz (depending on load)

Nom. power handling: 75 W/150 W

Sensitivity (2,83V/1 m): 88 dB

Nom. Impedance: 4 ohms

Voice Coil Diameter: 32 mm

Voice Coil Height: 22 mm

Xmax: 8 mm

Free air Resonance(Fs): 53,43 Hz

Compliance volume (VAS): 5,25 litres

Total Q (Qts): 0,495

Electrical Q (Qes): 0,52

Mechanical Q (Qms): 10,09

Voice Coil DC Resistance (Re): 3,09 ohms

Driver Area (Sd): 86,6 cm2

21 WX Features:
 

Subwoofer 21 cm "W"

Frequency response (+/- 3 dB): 29 Hz (depending on load)

Nom. power handling: 250 W/500 W

Sensitivity (2,83V/1 m): 86,5 dB

Nom. Impedance: 4 ohms

Voice Coil Diameter: 50 mm

Voice Coil Height: 25 mm

Xmax: 8,5 mm

Free air Resonance(Fs): 36,63 Hz

Compliance volume (VAS): 18,8 litres

Total Q (Qts): 0,6

Electrical Q (Qes): 0,77

Mechanical Q (Qms): 2,81

Voice Coil DC Resistance (Re): 3,4 ohms

Driver Area (Sd): 208,7 cm2