I am using a Pass Labs X-250 to drive MartinLogan Aerius i's, which drop to 1.2ohms at 20Khz fully driven.
Though it does spike the built-in power meter pretty hard on heavy treble transitions, the amp NEVER sounds stressed, and seems to be designed to shrug off this kind of load. If anything, these speakers are now the weak-point of my system - not the amp.
Standard Disclaimer:
YMMV - This is only my personal experience - I don't know everything - please do not flame me.
Though it does spike the built-in power meter pretty hard on heavy treble transitions, the amp NEVER sounds stressed, and seems to be designed to shrug off this kind of load. If anything, these speakers are now the weak-point of my system - not the amp.
Standard Disclaimer:
YMMV - This is only my personal experience - I don't know everything - please do not flame me.