Jafant, Not all Pass Labs and Krell's can keep doubling down to 2 Ohms. Furthermore, even if a manufacturer suggests that they can, it might be prudent to check third party testing results such as those found in Stereophile, etc.. I quite often find that manufacturer claims, even from some of the more popular and respected brands frequently don't measure up to expectations. While I don't have a lot of confidence in all of the loudspeaker measurements, there seems to be little to fault with regard to their electronics measurements.