Pjilefreak, I don't have detailed specs for my CLS's (original version), but the guys at ML say that the impedance drops to 1.5 ohms at high frequency and increase to 32 ohms in the mid-bass. I know that the next incarnation (CLSII's) dipped to about .5 ohms but didn't swing nearly as wide in the other direction. The IIz electronics ,ake the speakers a bit tamer all the way around. Again, I have the original version which always did well with tube amps.