These Speakers were built to a Budget that was constraining the cost allocated for the Xover.
Move forward to the current times, Xovers from a particular era, especially a Vintage era, when met with State of the Art Components from the current era, will create a very attractive circuit to divide the Source Signal into different frequencies. A lot less distortion is likely to be created using the new components, resulting in less corrupted Signal being converted to become the End Sound.
The Link will show how adventurous other Owners have been willing to express their speakers.