RE Audio REX8D4 8" Subwoofer

Features:
Electrical Q Value -Qes: 0.38
Mechanical Q Value -Qms: 4.21
Total Speaker Q Value -Qts: 0.34
Free Air Resonance -Fs: 22.8 Hz
Equivalent Compliance -Vas: 27.1 liters
One-Way, Linear Excursion -Xmax: 12 mm
Efficiency -SPL 1W/1m: 81.2 dB SPL
Effective Piston Area -Sd: 195 cm^2
DC Resistance -Re: 3.2 ohm
Nominal Impedance -Znom: Dual 4 ohm
Thermal Power Handling -Pe: 175 W
Force Factor -Bl: 15.4

Specifications:
Mounting Depth - 4.5"
Mounting Hole Diameter - 7.3"
Overall Diameter - 8.7"
Bolt Hole Circle - 8"
Motor Width - 4.875"
Motor Depth - 1.9"
Basket Depth - 2.4"
Displacement - 0.07 cu. ft.