So I've had my Lyr for several hours now and here are some of my initial impressions:
Build Quality = Brick Schiit house. It is roughly the size of my Concerto but 50% heavier (really solid). The metal casing is quite attractive.
Sound with my HE-6s: Finally a headphone amp that I have to turn the volume down to run them.
Bass extension is deep (similar to that of my Pioneer Elite home theater receiver from the headphone jack). On my WA2, the volume at 3 o'clock, the bass is also quite good though not as visceral. The Concerto seems a bit too polite here. Listening to Magnificent (by U2, No Line on the Horizon), it's got some really powerful bass at the beginning and the Lyr was able to convey the power (just like my speaker amp/receiver). A great ability to control the bass is also very apparent.
The mids are nice and forward and the treble is fantastic.
Initially I ran the JJ 6922 tubes and found the amp a bit too clean for my liking...so after a few frustrating minutes, I was able to remove the stock tubes and ran some of my favourite 6922 tubes (Genalex Gold Lions) and the amp warmed up slightly...a bit more organic/tube-like...just how I like it. The sound stage seems to have opened up a bit as well.
I've got Ron's (Highflight) pigtail adapter arriving within a week or so. I plan to compare the Lyr to the speaker taps on my receiver. That should then let me know where I'm going next.
So far, very impressed with both the HE-6s and LCD-2s. Of my 3 amps on hand, this amp is definitely my go to amp for my HE-6s. I'll need more time to make that call on the LCD-2s.