Classe Audio DR-9 (David Reich's last design for the company). It's a high-current amp (400 stereo watts into 2 ohms, 200 into 4 and 100 into 8) and he thought it would do a better-than-adequate job. Agree?
I was a Magnepan dealer for many years. Your DR-9 will be superb with the LRS. Should be a GREAT combo!