Free Air Resonance (Fs): 31.49 Hz

Electrical “Q” (Qes): 0.523

Mechanical “Q” (Qms): 7.017

Total Speaker “Q” (Qts): 0.485

Equivalent Compliance (Vas): 1.138 cu. ft. / 32.23 liters

One-Way, Linear Excursion (Xmax)*: 0.550 in. / 14.0 mm

Reference Efficiency (no): 0.185%

Efficiency (1W/1m)**: 84.87 dB SPL

Effective Piston Area (Sd): 53.475 sq. in. / 0.0345 sq. m.

DC Resistance (Re): 3.567 ohm

Nominal Impedance (Znom): 4 ohm

Thermal Power Handling (Pt): 500W

Driver Displacement: 1.39liters

Net Weight: 5.56 kg

Nominal Diameter 250 mm

Overall diameter 267mm

Mounting hole diameter 230 mm

Bolt hole circle 246.5mm

Magnet diameter 133mm

Mounting depth 151 mm