This was built by 2 audiophiles with precision tools, determination, extensive experience, and perfectionism. This is a DIY kit that is no longer offered on Elemental Designs website but you can order it if you call them. It is a vented 18" subwoofer enclosure with a 500 watt plate amp. It stands 36" tall 24" deep and 22" wide. This thing is a MONSTER SUBWOOFER. This is for REAL BASSHEADS. If you want chest pounding and foundation shaking bass then this is your ticket. This thing is a year and a half old. Was in a pet-free, air conditioned and smoke free environment.