American Bass Xfl1244 12 2000w Car Audio Subwoofer Sub 2000 Watt IMP-2X4 ... FO(Hz)-33.6 ... SD(msqM)-51.07 RDC-1.7 ... LEVC(MH)-2.185 QMS-3.611 ... BLTM-13.94 QES-0.497 ... QTS-0.437 n(%)-0.534 ... SPL(Db)-89.6.