I had the 1.2's for an extended period driving Avalon Eidolons, an acknowledged difficult load for some amps to drive. The 1.2's had no problem driving the Eidolons. They are very musical ss amps, and had the balls to to make the Eidolons sound full with great bass response. I did find that Synergistic Res. Designers Ref Squared PC's worked extremely well on the 1.2's, tightening up the bass and low end over some other cords I tried ( Shunyata, XLO, Electraglide, and obviously stock). Although I have no personal experience with the X series, I have heard from reliable sources that it is perhaps superior to the Aleph's.