"Honestly, I am finding it a bit difficult to "like" the JC-2. I had very high hopes for sound improvements. What would you specifically look for when comparing pre-amps?"
That's why you need a really good line stage if you want better sound than your passive. One thing you need to do before making a final decision on the JC-2 is leave it on for a while. I've seen many times where SS gear benefits greatly from letting it warm up for a day or so. If you leave it on from now until tomorrow, it should sound better. I still don't think you'll keep it, but you never know. If you want to try a different active, I still recommend the Ayre K5. There's a good chance you may like it better than your passive.
"The JC-2 seemed "louder" and I cannot go past 9 O'clock position for my normal listening position."
That's normal. A passive preamp doesn't have an amp. An active one does.
That's why you need a really good line stage if you want better sound than your passive. One thing you need to do before making a final decision on the JC-2 is leave it on for a while. I've seen many times where SS gear benefits greatly from letting it warm up for a day or so. If you leave it on from now until tomorrow, it should sound better. I still don't think you'll keep it, but you never know. If you want to try a different active, I still recommend the Ayre K5. There's a good chance you may like it better than your passive.
"The JC-2 seemed "louder" and I cannot go past 9 O'clock position for my normal listening position."
That's normal. A passive preamp doesn't have an amp. An active one does.