Electra is the most value for money in the focal line up for the amount of performance they deliver at their price, they are fast,transparent,extended,detailed and very good sound stage in terms of depth and width, i find them to be sweet sounding specially compared to speakers such as avalon,current B&W 800 series,Thiel,ATC SCM 19 and above(although i love the ATC SCM 19 and it kills my Electra bookshelves in the bass and transparency dept) and few other speakers i have heard recently.
Utopia has everything Electra has but it is more transparent and this is very noticeable, bigger deeper sound stage and after you hear utopia series and get back to Electra then you find Electra a bit boxy sounding,bass is more textured and deeper,definitely more details but still the same sweetness that Electra has.
This is my personal observation and i hope it gives some insight.
I guess my point was not clear or may be you understood differently, no where i said AVM 5.2T is not powerful enough to drive the Electra, in fact that's the amazing thing about these speakers, they don't need "watts" they just need quality "watts" with good "current".Focal used pair their grande utopia's with 40 watt lavardin amplifiers for their shows so that explains a lot, my post said AVM 5.2T might not be a high current amp and focal works really well with high current amps,its just like how certain high end headphones work well with OTL amp's while others don't.
When you say AVM 5.2T drove stella utopia really well that does not guarantee that amplifier is a good match for the speaker, i have a 200 watt power amplifier paired with a tube pre-amplifier which i used with my Electra bookshelf, but 2 years ago i switched to a 20 watt class A amplifier and there was day and night difference in the way the 20 watt class a amp made the Electra sing and i have not switched back, specially the speed and rhythm, i listen to a lot of 70's and 80's music so for me that is very important.
But anyways thanks for your insight and i hope i chance to listen the Eventus IO.