Nominal Basket Diameter  15", 381mm
Impedance 8 ohms 
Power Rating 300Wrms
Resonance 33Hz
Usable Frequency Range 40Hz - 4kHz
Sensitivity click here for guide
Magnet Weight 59oz.
Gap Height  0.3125", 7.94mm
Voice Coil Diameter    2", 50.8mm

Mounting Information 
Recommended Enclosure Volume  82 - 139 liters
     (vented)  2.9 - 4.9 cu. ft.
Overall Diameter     15.15", 384.8mm
Baffle Hole Diameter   13.77", 349.6mm
Front Sealing Gasket fitted as standard
Rear Sealing Gasket  fitted as standard
Mounting Holes Diameter  0.25", 6.4mm
Mounting Holes B.C.D.  14.56", 369.9mm
Depth 5.94", 151mm
Shipping Weight         13.7lbs., 6.2 kg.

Thiele-Small Parameters
Resonant Frequency (fs) 33Hz
Impedance (Re)    5.98 ohms
Coil Inductance (Le) 1.73mH
Electromagnetic Q (Qes) 0.32
Mechanical Q (Qms) 5.13
Total Q (Qts) 0.3
Compliance Equivalent Volume (Vas) 314.1 liters
11.09 cu. ft.
Peak Diaphragm Displacement Volume (Vd) 258cc
Mechanical Compliance of Suspension (Cms) 0.305mm/N
BL Product (BL) 17.2 T-M
Diaphragm Mass inc. Airload (Mms) 77.5 grams
Equiv. Resistance of Mechanical 
          Suspension Loss (Rms) 3.11N*sec/M
Efficiency Bandwidth Product (EBP) 101.6
Voice Coil Overhang (Xmax) 3.0mm
Surface Area of Cone (Sd) 856.3cm2
Impedance at Resonance (Zmax) 101.5 ohms
Maximum Mechanical Limit (Xmech) 23.50mm
66 ohmsW
21.34mm