Are going from a single-ended source (rca) into the Mjolnir?
I don't really want to read how good the HD650 sounds through this amp. I regret moving the HD650 on and have grappled with the temptation to own it again. The real test for the Mjolnir (in terms of how it's voiced) will be the HD800 imo. I hope someone can weigh in with impressions to make the wait for mine more bearable.