I did the upgrade from Uber to Bimby over the holidays and in a word: more. More of everything. Highs are clearer, cleaner, and more energetic without becoming fatiguing. Lows are deeper, tighter, faster and more expansive without bloat. I found a new appreciation for the lows the Primes can reach after this upgrade. More air, like the cups of the Primes are somehow sitting about 6 inches away from my ears yet clear as a bell. I get lost in songs I know well. More.
What I'm really interested in now is that as I have gotten more used to the Bimby sound, I'm starting to roll tubes and the LISSTs into my Lyr 2, and seeing how the Bimby affects my perceptions of my various tubes' signatures. Based on what I was reading, I didn't expect to like the LISSTs, thinking that all the solid state-ness together with the extra clarity others attributed to the Bimby would bring harshness or an anodyne quality. Not the case. I need to dig a bit farther into my classical and orchestral music in this regard, but so far all of the jazz and acoustic guitar stuff I know and love sounds fantastic with the LISSTs in the mix with the Bimby. When I roll in my Ediswans, Durutti Column's Dry album sounds like it's in a hazy, smoky lounge and I'm sitting in the back soaking up all the harmonics and depth; when I roll the LISSTs in, it's like I'm in a quiet coffee house right up front, hearing Vini Reilly's pick on the strings and everything is immediate, visceral.
I still have some Telefunkens and Heerlens to roll in, too. Damned excited about having a longer listening session this weekend.