Pair of Alpine SWR-12D4 (swr12d4) 12" Dual 4 Ohm Type-R Series Car Subwoofers 12" Dual 4-Ohm Type-R Series Car Subwoofer Power Handling: Peak: 3000 watts / RMS: 300-1000 watts Kevlar treated pulp cone / Durable HAMR Santoprene surround Progressive Conex spider / Compound Radius Curve pole geometry Top-mount depth: 6-3/8"