If your last question was directed at me you have to bear in mind that Profile amps, while very reliable for a budget amp in my personal experience, are also somewhat optimistic on their wattage claims ~ but thankfully not grossly optimistic.
It's rated to output 420 @ 2 Ohms.
I used that model amp on a pair of SVC 4 Ohm, 200w RMS-rated eXcelon 10s once upon a time and it kept them working pretty hard.
If I had to make a guess I'd wager it outputs around 400w actual (though I never actually benched the one I used to have)
I don't know which end of your stated 4-600w range you'd prefer...just thought I'd throw it in there as a suggestion b/c it's on the cheap side of things //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif