Can a 5 channel amp that's rated to do 75w x4 and 350 x1 at 4 ohms, and 100w x4 and 600w x1 at 2 ohms, be wired at 4 ohms for the mids and highs so they get 75w rms and wired at 2 ohms on the sub channel so it gets 600w? Trying to figure out if I should just get two different amps or if I can get what I want with a 5 channel!