The parameters for the SRX15 are:
Electrical Q Value -Qes: 0.45
Mechanical Q Value -Qms: 4.87
Total Speaker Q Value -Qts: 0.41
Free Air Resonance -Fs: 23 Hz
Equivalent Compliance -Vas: 203 liters
One-Way, Linear Excursion -Xmax: 18 mm
Efficiency -SPL 1W/1m: 87.6 dB SPL
Effective Piston Area -Sd: 810 cm^2
DC Resistance -Re: 1.8 ohm
Nominal Impedance -Znom: Dual 2/4 ohm
Thermal Power Handling -Pe: 300 W
Force Factor -Bl: 14.35
Tuning frequency per winisd is 21hz. Box size is 8.8ft^3 ported and 4.235ft^3 sealed.