Hifonics brutus bxi2000d, 2000 watts rms at 1 1k at 2 and 500 at 4, very well built although a bit under rated but I have never had any problems out of mines, had a 1500 watt one before and it was getting ran hard all day everyday at .6 ohms and it still took about 4 to 6 months to blow them. I went through 3 of them before I figured out the guys that work at my local shop are complete dumbasses, but even then they preformed flawless right up to the boiling point even on a stock electrical system