supposedly what people that have tested them are sayin is that if your gettin the new brutus series, run them at 1ohm or get different amp. if you run them at 1 ohm you get the full 1000 or 1500 depending on what amp you get but if you go with a 2 ohm setup then you get a lot less watts. this is not from experience, this is from what i have seen from other people that have used them