Don’t forget that in a passive system you have to balance cabinet volume, efficiency, and extension. I don’t think KEF is into 70dB/2.83V/1m speakers, so to really allow higher bass SPL into a smaller volume an active design is required. So subwoofers or active speakers. It would be nice to see KEF launch actives that compete with Adam/Genelec/Neumann on design, but in home friendly cabinets. They will have to get over their current stupid allergy to grilles though.