Ok, I've asked this question before.. but would like some re-assurance now... The amp that I want will have to be able to power two sets of component speakers at 100rms. Here are my choices: Xtant 404m - 4 x 100 Watts Per Channel @ 2 Ohm Infinity 7541A - 111 watts RMS x 4 at 4 ohms PPI DCX 600 - 150 watts x 4 at 2ohms.