Hi Serenity Now,
I am running my LFR1100s with a 4-channel ADA1500 which is about 700 watts RMS per speaker and lots of dynamic headroom above that.
OK, you have me very confused. with your chart http://www.axiomaudio.com/1500-amplifier
it lists the ATA1500-4 at being 350watts at 4ohms and 325watts at 8ohms. I have the LFR1100 and running with the ATA1000-4 is shows me maxing out at 250watts. So do I have far more head room than I realize, or are you adding up the fronts and the backs into a single number?