I have been driving my Martin Logan QuestZ's since they were new with an Audio Research LS22 and a pair of Audio Research Classic 150's which I have also had since new. The Classic 150's can drive any impedance down to 1 ohm.I have owned Martin Logan speakers since 1985 or so and to date I haven't found another amp of any kind that can reproduce deep bass and such a wonderful sound stage as the Audio Research. The proper tubes in both unit are essential.
The older Audio Research gear is now quite a bargain and if properly maintained will last for a very long time.
The older Audio Research gear is now quite a bargain and if properly maintained will last for a very long time.