I recently picked up a pair of used LSi9's for the hell of it. They were sitting in the original owners closet for a few years and they needed about a two weeks of frequent play to open up.
I was pretty impressed but felt it could do more. After much research and experimentation I got these well built monitors to achieve true high-end sound.
First and foremost, they must be bi-wired. They really opened up in the midrange, projecting a clean, slightly forward vocal range.
Next was partially stuffing the rear port with foam rubber. This speaker is a bit bass heavy and my ears are very sensitive to this. I lowered this midbass thickness by ear with the foam rubber.
They need good sand or lead shot filled stands. You don't have to spend a fortune. The Pangea DS03 24 inch works well.
Finally, position it well away from rear and side walls with a good solid state amp and I'm sure you'll be impressed.