I currently own a pair of Martin Logan WSL Impressions

Considerable step up from the Peachtree. How much, the wallet and ears will let you know.

You're going from a practical compact to a Porsche with manual 5 speed. Do you know how to drive a manual? Interesting decision you made with all the options out there.

Definitely will make your ML's sing like never before. You're also gonna need a preamp, so add another $5K+.

pvmike

All ML esl’s are great speakers BUT!!! need an amp that can do current even the ones with active bass (I’ve had a few ML esl’s) they can go down to low impedances especially 1ohm in the highs and sound rolled off with unsuitable amps. Peachtree??(Class-D’s) don’t seem to like the 1ohm either for stability.

Your ML’s don’t need many watts being 91dB efficiency, but still need that current.
A great amp I can think of is a Gryphon Diablo 120 integrated (or 300)
https://gryphon-audio.dk/produkt-kategori/integrated-amplifiers/
And if they are too expensive the equivalent (working mans Gryphon) the Parsound Halo Hint integrated or later Hint 6.
https://parasound.com/hint.php
https://parasound.com/hint6.php

Cheers George