What is the improvement with Linkwitz LXsub4?

You assume wrong, here its mated with all open baffle speakers.
The advantage is dipole, figure eight, pattern of radiation. Less boomy clean open sound. Open baffle bass is harder to achieve, since due to cancelation it requires eq and preferably high xmax woofers. But if you like resonant boom boom bass pressurizing your room, stay away from open baffle.
 

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