I may have to reassess my previous statement of the M51 and Mjolnir being overkill for the HD650. The fully balanced system is revealing an incredibly wide soundstage with certain material. Audio cues seemingly originating beyond the headspace are making me look instinctively over the shoulder to investigate the source. My HD650 is giving me a sore neck.
Although my system isn't balanced like yours, I understand your point completely as I primarily bought my Lyr to drive my HE500.
However, the Lyr is now always connected to the HD650, while the HE500 is always driven by a vintage Marantz 2226B.
Overkill be damned, I couldn't be any happier.
Edited by OldSkool - 2/25/13 at 8:40am