Nice one mate!
Very glad you finally found a real power amplifier! I firmly believe you now understand the difference between the term - actual power amplification vs normal amplification... and Parasound is not a regular amp! You will begin to realise the vast improvement in performance compared to the Marantz...
This is what I've always been referring to and simply cannot stress enough, the high current and stable voltages are a must have combination to drive any ESL effectively. You can't have only half or the other, it just doesn't work and so many people continue to use Receivers or amplifiers with far too many bells & whistles, and then complain their ESL's sound too bright or thin... they simply run out of puff!
From having the Parasound, now you'll realise the greater sense of control, drive, life like presence, and most of all the grip it has on stats. Those are the basic elements of a high quality amplifier.
Still to this day, I do wonder why at some hifi shows the ML team demo some of their gear with very entry level amplification... I guess their rationale is to sell more speakers if they can get away with it. Hence, it's a real shame they do this because the moment you use something of far greater quality, the performance just shifts into another dimension! There's no denying it.
Always remember, your system is just as good as the main amplifiers driving it. Especially with ML's and other high performance speakers. If you're using mediocre amplifiers then that's the overall sound you're going to get. If you've using something really tops, ML's can deliver SOTA in a blink of an eye!
Cheers, and enjoy those fine tunes!