Sorry about the late response.

Painttoad-
Thanks for the info. That was very helpful.

Tekdredger-
No, I don't have one yet. Right now, I am using several QSC RMX amps and Selenium pro drivers in tri-amp mode with some duplicated channels. Would you like to recommend some nice models? I only need some 200W per channel stereo amp.

I also have a question. I am not sure if you know it or not. I went to a local car shop today (Similar to electronic store that kind of car audio demo room) to check some amps and found they were able to power up several of those amplifiers in their demo room instead of cars. How did they do that? Where did they connect their power? Are they also using the power supply? Let me know what you think. Thanks.

JT Clark-
Thanks for the sub amp recommendation. But I need an amp that will do 20HZ~20K so I can use it for mid-woofer and tweeter also. Thanks anyway.