Wondering if anyone can identify the speaker in this screen grab

Ah - yes - maybe the Avalon Idea MK2. Interesting - thank you.

(oops - looks like this has been discussed on Audiogon before ; in this article he specifically talks about the "Avalon Eidolon Diamonds")

I was just listening to the set that came out in 2016 - "A Multitude of Angels" - 4 concerts from October 1996 that were the last long-form improvisations he ever did (he already had Chronic Fatigue Syndrome at that time). In that case, he also recorded the concerts himself, using a pair of transformer-less microphones and a Sonosax DAT Recorder.

Avalon is the first thing I thought of. also.

I’m impressed.  Many musicians have garbage systems.  Wonder what he’s driving them with?

That article is pretty detailed (it's originally from 2005)  In it, he says "what I’ve been using for quite a while is a high-end tube preamp from Convergent Audio Technology with very good transistor monoblocks [BEL 1001 Mk III] "

So - if he is still using the Avalon Eidolon Diamonds then he has had those for a very long time. But - at that price (over 30K I think) - hopefully you wouldn't get the urge to swap them out in a year or two.

That Rick Beato interview is quite good by the way - Jarrett actually plays a few things with just his right hand (after his strokes, he no longer has the use of his left hand).