Well, I just dove into the diy headwaters and built an ebs box for an av12mkII driver and a rythmik A350 basic amp. I finally got the box ready enough to try it out and put in the driver and amp. Connected it to my sony receiver and turned it on. Nothing. So either I have a bad amp, driver or screwed something up. I wired the coils in series to get 4ohms. What can I do to find the weak/broken link? Rich.