SpeakerMax folded horn sub woofer with black carpet covering. 18 inch woofer with 100 oz magnet and 4 inch Kapton voice coil. 500 watts RMS, 1000 watts peak. Frequency response: 35Hz to 300Hx. Sensitivity:100 DB (1w@1M). 8 ohms Speakon and 1/4 inputs. Cabinet is made of 3/4 inch Tight-Ply plywood (more layers, more glue, compressed much more than standard plywood). Size: 37h x 24.5w x 36.25d. Weight: 124 lbs.