Free Air Resonance (Fs): 27.2 Hz
Electrical “Q” (Qes): 0.514
Mechanical “Q” (Qms): 7.807
Total Speaker “Q” (Qts): 0.482
Equivalent Compliance (Vas): 66.0 liters
One-Way, Linear Excursion (Xmax)*: 29 mm
Reference Efficiency (no): 0.249%
Efficiency (1W/1m)**: 86.2 dB SPL
Effective Piston Area (Sd): 84 sq. in. / 0.0542 sq. m.
DC Resistance (Re): 2.47 ohm
Nominal Impedance (Znom): 3 ohm
Thermal Power Handling (Pt): 1000W
Driver Displacement: 4.0 liters
Net Weight: 20.4 kg

Nominal Diameter 305 mm
Overall diameter 318mm
Mounting hole diameter 267 mm
Bolt hole circle 286mm
Magnet diameter 191mm
Mounting depth 241mm