I had the original LRS for a while, and the 1.7i
25 watts of good tube power will drive them in a smaller room. 50 watts even better. I was using Black Ice and Cary gear.
Bass can be a little lean, Room and music dependent.
FWIW, I have relatively large SS mono-blocks driving the 1.7i now. Sold off all my tube gear.
In my opinion Magnepans sound best at medium-loud volume levels. Not made for blasting thumping electronica at 100+ dB...