DD Audio SL612 D4

Features:

12″ (30cm) subwoofer with EROM surround.
High temperature 2.5″ voice coil
Double layer spider system
Three-layer flat diaphragm body
72oz magnet
Coil gap ventilation at rear plate
DD cast aluminum frame
Speaker size (In): 12
Watts RMS: 300 - 600
Watt peak power: 1200
Impedance: D4
Voice coil (inch): 2.5
Data:

Fs (Hz): 27
Qms: 7.906
Qes: 0.432
Qts: 0.409
Vas: 68.349
Xmech (MM): 40
Xmax (MM): 14.5
Dimensions:

Frame outer diameter (cm): 31.9
Frame outer diameter with gasket(cm): 32.5
Mounting diameter(cm): 28.7
Mounting depth(cm): 10.5
Engine diameter(cm): 16,51
Motor depth(cm): 3.81
woofer displacement : 0.06 litre
Shipping weight: 8 kg
Enclosure Recommendation:

Closed cabinet : 22.5-42 litres
Bass reflex cabinet : 28-50 litres.