will
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It seems really difficult to guess on this with accuracy...
I have done a lot of work over time on my speakers and amps, and find it is often trial and error/success that defines improvements. That said, I have brought about many, many improvements, based on sound, using parts I suspected would work well in a given place....wires, caps, resistors, connectors, attenuators, damping, etc.
I did my research, so narrowed things down based on my experience and preferences, and on characteristic sound qualities others found with parts. Sometimes the first try made a good improvement, where others I needed to try several variations to meet my criteria of.... One part at a time and nothing staying in if it was not an improvement across the board, without compensation per se by tuning with other parts.
Another thought for me is: Was the design and designer of these speakers in sync with what I would want?
Even imagining, like 4K, they may have gotten it pretty right with the drivers used and associated cabinet design/tuning...I would think this does not necessarily mean the driver, other parts and wires, and tuning used were optimal at this point in time....The big questions seem to be: Are the drivers as good for these cabinets as the Lii driver you are looking at? Do you necessarily agree with the vintage sound choices in how they work with modern gear, room treatment, etc? And can the cabinets be easily tuned if necessary to refine for the Lii drivers....
In my case, modifying non-vintage pieces, I was able to improve gear made by some very good listeners, designers and builders, gear carefully tuned to what they considered optimal! I was able to get things way better for my needs, and I suspect by any standards. This was mostly by using better parts in the right places, parts that all work well together, and all finally determined by sound.
Not to try and confuse the matter....just some personal experience. With no experience or story with your speakers though, I can't say if these cabinets are worth exploring further, or if "the right" new drivers would help. Just that conceptually, if you like the design ideas and stories about the speakers, but feel like they could be better for your needs (with the direction the Lii's might take them balance-wise) seems to me it may be possible to make them better.
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