You're reading my thoughts, Ian. Thanks for the hints.
Yep, step by step. Can't await the first correct setup for listening - what I've heard already in a far less than serious configuration is hard to believe. Once I have an equal pair of woofers (there was only one 2235 so far), there will be a new point zero, to start with optimizing the setup for these 4343's. I agree both would be reasonable ways to proceed.
Here's a first impression of the "new" enclosures, during the inspection of their inner life. They are still the first (in german Ur-) version of the 4343 I believe, SN 22439 & 22442?
BTW, a lot of new JBL blue in the listening room here - and its just beautiful, got used to it within the first 24h.