Awesome be the mighty forty-three forty-three
All I can say about the 4343's is that of many, many, many great and not so great loudspeakers I heard since around 1957, the JBL 4343 is the best speakers I have heard when used in a very good room environment and with top notch electronics.
If I had the space available and fiscal wherewithal I would have three completely refurbished JBL 4343's and use them in a system with my Spread Spectrum Technologies Trinaural Processor.
Two LSR-32's in the rear of the space in a Dynaquad configuration, having its own two channel amplifier.
Do it! You will not regret the choice
Regards, D_E