if it says it will do 400watts at 2 ohms by 1 channel then it will do 400 watts but if it says 400watts by 2 channels then it will do 400 watts 2 each channel and as for the cvrs man i have them 2 15's and my overall opinion is dont do it man get the cvx's and if you cant afford thoes go with something else man i like them but to be quite frank they suck hard man i am waiting for the day to hear them go i have them at 1 ohm and they are seeing 600 watts each i have bottomed out one and im pretty sure they have been clipped and they have been abused so much but there still holding on i would say they are a good beginner sub cuz they are quite forgiving little bastards