Lanzar MAXP2051D 4000 Watts Monoblock Class D Amplifier (Discontinued by Manufacturer) (Certified Refurbished) This Certified Refurbished product is tested & certified by Lanzar to look and work like-new. The product includes all original accessories, and is backed by a 90-days warranty. 11 x 1000 Watts RMS at 4 Ohms - 1 x 2000 Watts Max at 2 Ohms - 1 x 4000 Watts Max at 1 Ohms - Bass Boost Circuit Variable Phase Shift Control - Variable Subsonic Filter - Variable Low Pass Crossover - 2 Ohms Stereo Stable Anti-Thump Turn-On - Tri-Mode Configurable - Soft Turn On/Off - RCA Line Input and Output White Light Illuminated Crossover Control - Power Protection LED Indicators - Advanced Protection Circuitry