Have you ever listened to systems that have an active sub integrated in them? And which ones and where? There are many out there now. It's a growing trend.
And having owned about every Raidho speaker while Michael was there. The only way I could get the bass to work in my room was because of subs counter acting his bass.
That being said. Michael designed the Raidho speakers at a low volume level. So the extra bass he used was a loudness control. And it was great -- just not the volume that people in the USA listened to them. I still to this day love his work for low volume listening - basically background music.
Once again, this is not about Michael Borresen, it is about the issues active bass presents, it is not a cure-all. And yes, I did hear a few such systems, most recently the Paradigm Persona. BTW, YG become much more enjoyable once they went all passive.