Many subwoofers with speaker terminal connections will not feature HPF functionality and will simply pass the “Full Band signal on to the speakers connected to it.
Nobody in their right mind is putting together Atmos tracks with very low frequencies in anything but the LFE channel and some low frequencies in the Front channels for use in systems with no subwoofers.
Even when setting ALL speakers to Large/Full Band and connecting numerous subwoofers with HPF functionality to ALL of the speakers in a given system, Atmos tracks will have the lowest frequencies in the LFE channel. With no subwoofer available, the Front channels will handle low bass duty.
Only those with robust amps and very capable speakers should ever consider setting speakers to Large/Full Band when playing any of today’s multichannel movie and music tracks at considerable volume.
For more localized bass NOT in the LFE channel, some new Denon/Marantz units have “Directional” mode support for up to four subwoofers. Using four subwoofers, each would handle bass below the crossover of those speakers in their quarter of the room and ALL of them would be fed low frequencies in the LFE channel.