Resilient Sounds Platinum 18 V213% larger motor 20% longer 3 8 layer coil BL^2 RE increased by as much as 50% (plat 12V1 vs Plat 12V2) 10 spider pack with insulated dual leads. Carbon fiber cones and dust caps will come standard with the platinum line. New high roll tooled surrounds. Cast aluminum frame conservative rated at 2,500RMS 5,000Watts BOX SPECS CUBIC FT 4 6 CUBIC FT PER SUBWOOFER TUNING 28 33HERTZ PORT AREA 12 16 SQ INCHES OF PORT AREA PER CUBIC FT MOUNTING DEPTH 12. 5