No chance the Kef can pull that off haha
However, I'm not entirely certain how far I can push it due to the absence of a limiter as I mentioned earlier.
Additionally, the low-frequency extension is accomplished through DSP, what they call iBX technology.
But I highly doubt any material calls for 100dB at 20Hz. If you're looking for a subwoofer for booming movie explosions, the Kef 12b might reach its limits.............with music, though, and I tend to play quite loud at times (my mains are PA speakers), it handles my 4.08x2.93 room perfectly fine.
I inquired about the size because the larger the room, the more powerful subwoofer you'll require.