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Exactly (although not necessarily a DSP is needed for those filter functions), in the 80s quite some popular brands like KEF, B&W, Canton sold some external active filters with similar functions to use at the pre in / pre out or EQ or tape monitoring loop at the amplifier to enable similar deep response for some of their passive loudspeakers.and finally they are typically active with DSP, which means that they use EQ/filters to adjust the response to add more low end extension than would otherwise be possible in an identical passive speaker.
Nubert still sells some:
ATM Stand hier kaufen | Nubert
ATM Stand jetzt bei Nubert entdecken! Hochwertig verarbeitet ✓ Lieferzeit 1-3 Werktage
www.nubert.de
Here also some articles how to implement such yourself with a DSP:
Linkwitz Transform
miniDSP is a leading manufacturer of Digital Audio Signal Processors for the HomeTheater, Hifi, headphone and Automotive market. Join our large community of Audiophiles, Engineers and DIYers using our innovative products.
www.minidsp.com
Linkwitz Transformation
www.mh-audio.nl