Free Air Resonance (Fs): 32.09 Hz
Electrical “Q” (Qes): 0.640
Mechanical “Q” (Qms): 10.752
Total Speaker “Q” (Qts): 0.604
Equivalent Compliance (Vas): 1.095 cu. ft. / 31.01 liters
One-Way, Linear Excursion (Xmax)*: 0.45 in. / 11.4 mm
Reference Efficiency (no): 0.154%
Efficiency (1W/1m)**: 84.07 dB SPL
Effective Piston Area (Sd): 48.909 sq. in. / 0.0316 sq. m
DC Resistance (Re): 4.280 ohm
Nominal Impedance (Znom): 4 ohm
Thermal Power Handling (Pt): 300W
Driver Displacement: 0.96 liters
Net Weight: 3.40 kg

Nominal Diameter 250 mm
Overall diameter 267mm
Mounting hole diameter 230 mm
Bolt hole circle 246.5mm
Magnet diameter 128mm
Mounting depth 124 mm