Best phono stage for Lyra Etna SL cartridge?

For such a low impedance cartridge you may want to look at Transimpedance phono stages. These stages are said to mate well with low impedance cartridges.
I recently purchased a Sutherland Little Loco to match with my AT ART-9 (12 ohms) and it works very well. Sutherland also makes the Loco, Chanel D makes one as well, and other manufacturers. There is no loading with the stages. An internet search gives lots of info.

@sebrof  1+. Current mode is the way to go.

I thought that the impedance will control how bright or dark the sound is. I have slight sibilance that I want to get rid of, so I went to the lowest impedance of 14 ohms. I still hear some brightness. I can't lower the impedance anymore.

by Current mode, you mean Lino C?

@chungjh,

Have you tried tweaking the VTA.  Lowering the tail just a little bit (assuming you have a tonearm that has adjustable VTA) can often reduce sibilance.  If this does work, then go back and try higher impedance.  You may need to tweak & tweak until you dial in the best you can get.

Good Luck,