Hola Zip3kx07. The amplifiers of the woofers are built-in, so you can't see them. ML was using a pair of Parasound Monoblocks to power the Summit, also a bi-wired connection was used. Yes, they have IEC removable power cord. The same A.C. cable that powers the digital woofer's amplifier powers the panels. Each Summit has two ten inch woofers, one firing to front and the other is firing to the floor. At the begining, I didn't like it at all, because it is a new radical lool from ML. But as soon as you started to see it, you start to like it more each time. All I can say is: the best speaker from ML that I have ever listened. Still have their sound in my brain. The space between instruments, the fingering of the guitar player, the piano notes, the voices, the strings, the percussion instruments, the size of the instruments between them, a joy to listen...all were life alike. All I know, I want a pair for sure!
Happy listening,
Roberto.