speaker upgrade fever

Nice to see you mention Triangle which I believe are too often overlooked. If you are considering (especially) the 40th Anniversary Duettos I can't imagine you'd not be terribly pleased. I find them balanced, neutral, open, and so holographic that at times they can be nearly frightening. Fabulous speakers!

Thanks for all of your input folks. Many of the suggestions morphed into full range floor standing speakers that I don't think I have the physical space for.

I'll continue to find a monitor that meets my needs, no shortage of great options and suggestions.

QLN, never fatigued.

Must stay away from bright, analytical and clinical presentation. Room size 12’x19’. Music is jazz, acoustic Americana, Chamber, symphonic etc.

You want Fritz. In a lightly treated room they are pretty amazing.

Also, can't imagine your tastes and wanting to go with Triangle.  They'd hurt my ears, but let your own tastes decide.

If I had to blind upgrade from my KEF Reference 1's tomorrow, I would go with something from QLN, either the new One's or the Signature stand mount. I heard their top model at AXPONA last year, it was the best room at the show. As @gryphongryph said, there is little chance of fatigue and they sound great.