Hi all! First post!
I am running them on a nearfield setup: I listen 6 feet away from them in a tiny space with not-great acoustics. They are on shelves, higher than they should (but canted down to counteract it) and about 5 inches from the wall, which needed some acoustic foam behind them to balance boominess.
I listen to Jazz mostly and small ensembles classical. My dB meter averages around 52 dBs. and peaks at 60 dB. at the listening position, So not very loud. Below these levels, I need to engage the Loudness button on my Luxman (Class A 30w/60w into 8Ω/4Ω).
In my very non-ideal context, they sound full and dynamic. If I sit closer than 6 feet, the sensation remains.
I believe the Suns like an abundance of current, favoring solid state over tubes. This seems to be backed by your experience with the Elixir and the Leben.