Hey you guys... Sorry if this is a really stupid question but ive been trying to do the math and for whatever reason i cant figure it out myself. I really like the Gallien-Krueger "x"rb-II heads and my goal is to run a 15' at 8 ohms and and 4' 10s at 8 ohms. Im curious if the Gk 400RB-II which is rated at: Main Amp-480W@4ohm, 320W@8ohm, 1 kHz. -- Horn Amp-50W@8ohm, 5kHz (off the gallien-krueger site) would be sufficent enough to run the 4 10s and 15 or if id need the more powerful model... the 1001RB-II which is rated at: POWER <1% THD: Main Amp-700W@4ohm, 460W@8ohm, 1kHz -- Horn Amp-50W@8ohm, 5kHz Thanks alot for all your help. And sorry if this is stupid but i swear ive been trying to figure it out all day by myself ... thanks alot.