Can someone explain them to me. I read this guys thing on them but when I played them they didn't sound like the chord that he said it was above. Here is a link to the thing I read. http://www.guitarsite.com/HowToPlay/beyond_power_chords.tab
they won't sound exactly like you think they would because he is inverting them and playing notes other than the root in the bass. They are still diads because there are only two notes.