There is a brightness when playing loud that I do not like, other than that I really like the 4349s. Power is not an issue, my Mark Levinson is rated at 2x400W so I’ve been thinking that it’s either a matching issue or the speaker itself. I don’t find 4349 to be very efficient, the L100 played subjectively louder at lower settings, which has made me think that tube amps might not work very well (other than high power amps).
The LM 845-Premium is rated at 30W, if that power is sufficient also for listening at louder volumes that is great news. It’s quite expensive though, have you tried other tube amps with the 4349s (I’m thinking PrimaLuna etc that are well built but not as expensive as the 848-Premium)?