Spectral 30ss series 2. I Still like many tube preamps but not as my main system. once I went to the all Spectral system I couldn't go back. I tried a couple times but preferred the Spectral over my ARC Ref 5SE, TRL Dude, Cat SL-1 ultimate, Shindo, CJ ART, and many others. The Spectral is so clean with the best Midrange I've ever heard. Instruments have more weight and realism.. Voices are captivating.. This preamp gave everything I liked about tubes without the drawbacks.. The downside is that the initial investment is significant.. Spectral is the one for me.