this is the specks-on the subs--QTS-0.48--QES-0.53--VAS-2.634--FS-30hz--RE-1.5--XMAX LINEAR--26mm--XMAX-36mm---SPL-90db-1w/1m---BL-19.1----PE-1800 rms-----thay use the same basket as the --AB-VFL-15'' SUB WITH NEW SOFT PARTS FROM --FI--- AND A COUSTOM 4.5'' COILES - I PAID A LOT FOR THE SUBS HOW THAY SLAM HARD----I CAN DO LIKE-41''W--18''TALL--25''DEEP--ALL OUTSIDE MEASUREMENTS THATS ALL I HAVE STILL HAVE TO DO AMPRACK