I got my Lyr 2 this week, and I can't find anything negative to say about it. Yes I have the Alpha Dogs and they sound great on it, but I never thought that a more sensitive hp like the TH900 would sound so good. On low gain, I have no worries that the Lyr 2 is too powerful for any of my 25 - 32 ohm cans.
I'm pretty happy with my rig, right now. The Lyr 2 has line outputs that allow me to run my powered monitors through it. I'm also am using the Schiit Sys (in reverse) to switch between my Violectric V200 and the Lyr 2, all through the Bifrost.
I'm using '78 Voskhod silver shields and they certainly make for a great listening experience. I'm getting a warm sound with great bass presence and timbre. The mids are not too forward and the treble is lush and smooth. Extension in both the bass and treble are there, too. I really like the base sound signature of this amp and rolling in tubes to taste is going to be a blast!
Again, I never expected this to be my primary amp for the TH900, I bought it for my Alpha Dogs. The V200 is a pain to adjust the gain because of the dip switches in the rear, and the Alpha Dogs do need a boost on that amp. While the V200 is certainly more detailed (to my ears), that doesn't always equate to a more pleasurable listening experience. As far as soundstage goes, I'm tempted to give the nod to the Lyr 2, with the current tubes I'm running. With so many tube options it's hard to make any definitive comparisons.
The tubes are still powered while passing through to the line outputs. That's about the only negative that I can think of.
Edited by toobuzz - 7/17/14 at 6:05pm