I think they're rated for 400, but I bet there's guys pushing a lot more than that into them. I bet they sing nicely at about 600 or so. I've often wondered what doubling my power would do for the SQ of my system, but doing so would require me to replace my current 12" sub with one that could handle 600 watts. I'm also running 75 per side on my comps, but would like the hear them on 150 per side. I would probably have to replace my current 4 channel amp with two separate amps (which the two sparate amps would be more of a pain) as I don't know of any 4 channel amps that can do 150 X 2 + 600 X 1. I think my comps would handle 150 pretty easily.