Nominal Basket Diameter  12", 304.8mm
Impedance 8 ohms
Power Rating 400Wrms
Resonance 51Hz
Usable Frequency Range 50Hz - 5kHz
Sensitivity click here for guide
Magnet Weight 80oz.
Gap Height  0.375", 9.52mm
Voice Coil Diameter    2.5", 63.5mm

Mounting Information 
Recommended Enclosure Volume  51 - 83 liters
     (vented)  1.8 - 2.92 cu. ft.
Overall Diameter     12.38", 314.3mm
Baffle Hole Diameter   11.06", 281mm
Front Sealing Gasket fitted as standard
Rear Sealing Gasket  fitted as standard
Mounting Holes Diameter  0.275", 7mm
Mounting Holes B.C.D.  11.57", 293.8mm
Depth 6.22", 158mm
Shipping Weight         18.1lbs., 8.2 kg.

Thiele-Small Parameters
Resonant Frequency (fs) 51Hz
Impedance (Re)    5.71 ohms
Coil Inductance (Le) 0.84mH
Electromagnetic Q (Qes) 0.37
Mechanical Q (Qms) 7.56
Total Q (Qts) 0.35
Compliance Equivalent Volume (Vas) 81.7 liters
2.89 cu. ft.
Peak Diaphragm Displacement Volume (Vd) 169cc
Mechanical Compliance of Suspension (Cms) 0.21mm/N
BL Product (BL) 15.3 T-M
Diaphragm Mass inc. Airload (Mms) 48 grams
Equiv. Resistance of Mechanical 
          Suspension Loss (Rms) 2.02N*sec/M
Efficiency Bandwidth Product (EBP) 136
Voice Coil Overhang (Xmax) 3.2mm
Surface Area of Cone (Sd) 532.4cm2
Impedance at Resonance (Zmax) 122 ohms
Maximum Mechanical Limit (Xmech) 27.31mm