Did some comparing today.
ZX300 DAP feeding SMSL SU-8 DAC
RCA Y cable out feeding Vali 2 and Liquid Spark. Amps were volume matched to less than half a decible.
Both sounded very good, but different. My impression was:
1) The Vali 2 was really pushing the vocals out front, which I really enjoyed. Good full sound, with the vocals dominant.
I was playing about 10 songs from Florence and the Machine that I know very well (about 7 ALAC and 3 AAC). I was even changing the jack in the middle of songs. It was intense A-B testing, for me.
Once I started using the Liquid Spark the difference was noticeable. Mostly, the added/prominant bass. Very nice. With the rest of the music though it all sounded very "even". What I mean by that is that every instrument, including vocals, sounded like it was the exact same distance from me with the exact same volume and prominence. Not sure how to explain it, except that it seemed more balanced. You could hear, clearly, whatever instrument you wanted to concentrate on. Nothing was dominant, but the bass on certain songs kicked in with authority.
Two different sounds, but I liked both very much. If I had to decide which one to keep, I would be screwed. This may change when Jazz, Blues and varied Rock are tossed into the mix.
Now I am listening to the Westinghouse tube. Sounds pretty similar. I am not sure how much difference I will hear between tubes.
Still feeling pretty good about this purchase.
Shane D
PS: Forgot to mention - Grado GH2 headphones used.