Alright I finally have my HE-Adapter and stock balanced cable from Audeze. Been using them with my PrimaLuna Prologue Two for a few days now. My first impressions are somewhat mixed. I still have my Lyr on hand to compare to, but I've been trying to listen to only the PrimaLuna to get an overall feel. I also have my memory of how the WA22 sounded (which left a very good lasting impression).
Some initial things I've noticed about the PrimaLuna and LCD-2.2 combo: midrange is the main strength here. It sounds extremely layered, "thick", "lush", and "layered". The spatial information that's contained within the midrange comes through very well, and gives the soundstage a very expansive, full sound. Depth and width is very good, along with instrument separation. Instrument timbres are very good as well.
However, transient impact leaves a bit to be desired. Also, bass impact and extension doesn't quite match the Lyr, and definitely not the WA22. Treble extension I'd say is darn near close to what I'd describe as "mediocre". However, I do find that this is more desirable than a forced, grainy, and harsh treble.
Overall, my initial impressions are that this amp with the HE-Adapter does provide an enjoyable sound, but I don't know that I can say that it's better than the Lyr, and is certainly not better than the WA22. I'd say it's just say it's a different flavor than the WA22. I am going to obviously spend a lot more time with it, and see how my opinion changes over time. Since I've already owned the PrimaLuna for several years, this was my affordable alternative to purchasing a WA22 after having one on loan for 2 weeks. I was hoping that it would come fairly close to matching it, but initial listening has proven that this most likely will not be the case.
FYI, the tubes that I have in the PrimaLuna: 2 x Pope NOS 12ax7 (very good tubes, hard to find now), 2 x PrimaLuna stock 12au7, 4 x Gold Lion KT88