FI car audio sp4 V1 18 inch brand new $550

Brand new never used FI Caraudio SP4 18” V1 fully loaded dual 2 ohm Audio Motor TypeOverhung Driver Size18 " Driver Weight70 lbs Coil Diameter4 " Coil MaterialAL Manufacture's Xmax33 mm MSRP$550 USD Year2015 TS Parameters (Measured by {url removed}) Qts0.304 Qes0.328 Qms4.16 Fs21.2 Hz Res1.3 Ω Le 1khz2.61 mH Sd0.117 m2 Vas206.3 liters Mms521.5 grams Cms108 μm/N BL16.59 Tm BL2/Res211.8 N2/W L/R Time Constant2.01 milliseconds SplSens89.62 dB Notes This is a Fi Audio SP4 18� driver which has had the suspension softened up a bit for home theater or home audio use. This is the third Fi branded 18� driver that has been through Data-Bass and there have been a couple of other drivers which are also out of the Fi build house. This is the heaviest and largest of the drivers so far. The street price on this driver is roughly 550 Fi , sub woofer , Bass woofer , sp4 ,V1 , speaker , quad