To pull an RMS of 2000w, you're going to find usually thats at 2 Ohms and lower. Most of the amps that have a peak of 2000w, at 4 ohms, are probably going to see the actually pulling between 500 and 600 watts RMS. I think the Soundstream Human Reign 2 is good for around 1500 watts at 4 ohms. The Soundstream PCA3500D should do around 2000w RMS at 4 Ohms.