Free Air Resonance (Fs): 24.43 Hz
Electrical “Q” (Qes): 0.508
Mechanical “Q” (Qms): 9.474
Total Speaker “Q” (Qts): 0.482
Equivalent Compliance (Vas): 5.106 cu. ft. / 144.60 liters
One-Way, Linear Excursion (Xmax)*: 0.50 in. / 12.7 mm
Reference Efficiency (no): 0.180%
Efficiency (1W/1m)**: 88.20 dB SPL
Effective Piston Area (Sd): 122.317 in. sq. / 0.0789 m sq.
DC Resistance (Re): 3.555 ohm***
Nominal Impedance (Znom): 4 ohm
Thermal Power Handling (Pt): 500W
Driver Displacement: 3.09 liters
Net Weight: 7.2 kg

Nominal Diameter 380 mm
Overall diameter 394mm
Mounting hole diameter 349 mm
Bolt hole circle 370mm
Magnet diameter 160mm
Mounting depth 182mm