New JBL Studio Monitors (4349) Coming in September

I have a pair of 4429's that were in my main system for several years. They were displaced by other project speakers. Relegated them to a secondary system with a Yamaha CD player and a Denon PMA2000. I have always thought the bass was somewhat ill defined and flabby, especially the mid bass. Recently I replaced the Denon with an old Threshold S-500 that I bought new in the mid 80's. Also drug my Schiit Yggdrasil in as the D/A converter. Definite improvement across the spectrum. Bass is quit a bit tighter, but not as good as my main system speakers. I'm thinking about replacing the two air core inductors in the LF crossover with low resistance iron core units. My swag is the series resistance will drop from about 1.5 Ohms to 0.25 Ohms. Anyone have any thoughts on the mod? And I apologize for the thread theft. If I go through with the mod, and a positive comes from it, I'll start a new thread.

Regards John

Dave. My 4429's are probably early ones. I bought them as demo models in 2016. I thought the L100 Classics had the same woofers, but looking at them I don't think they do. Krells are supposed to be very high current capable amps, so it doesn't surprise me that they drive the LF well. I definitely heard a difference when I installed the old Threshold in the system. I need to move the 4429s back into the main system again, as equipment has been upgraded since they were there last.