(I might have mentioned this before but..)
Both my Joseph Audio Perspective and Thiel 2.7 speakers are rated down to 35Hz.
However the Joseph is a significantly smaller, slimmer speaker, using two 5.5" SEAS drivers in a 2.5 arrangement. The Thiels are a 3 way design - coax with a 4.5" midrange and an 8" aluminum woofer (and passive radiator).
The perception of bass and scale from each is interesting. The Joseph speakers are made to pack as much "big sound" in to a small form factor. (Hence thin cabinet, long excursion drivers). They do sound remarkably big and rich for their size, with pretty deep bass and a nice sense of "punch" to the upper/lower bass. However they sound slightly miniaturized in sonic scale vs the Thiels. The Thiels seem just big enough to make the scale of orchestral instruments more convincing. Plus there is a sense of power and solidity to the bass in the Thiels that aren't quite there in the Joseph speakers. The sense of a really solid kick drum or bass guitar moving air. This is especially so when I listen to either speaker from outside the listening room (my computer room is a bit down the hall).
From outside the room the Joseph speakers sound a bit more weak, and seem to run out of steam faster as I crank the sound up. The Thiels still sound like bigger, more solid acoustic bass instruments are in that room, and don't seem to run out of impact as I crank up the volume.
So I find the Joseph speakers do a pretty convincing impression of bass depth when I'm in the sweet spot listening. I actually love the bass quality of the Joseph speakers - within it's limits it has a nice sort of texture and articulation - I can really hear the very distinct playing of a bass guitar so easily. And I think the design lets the port play a bit of a bigger role in the sound so kick drums have a bit of added "poof/oomph" that makes them quite fun and I "feel" the room pressure with each kick drum strike. But the Thiels do bass guitar and kick drums in a more focused way - so I don't sense that "puff of air/bass" with each hit so much as the bass stays put in super dense focused spot in the soundstage, but sounds more "solid" and with a bit more deeper bass rumble underneath.
My intuition is that I'm generally hearing some of the advantages of sheer cabinet/driver size with the Thiels - there's just a scale and acoustic presence over the Joseph speakers. This especially shows up when asked to play louder. (Why then have the Joseph speakers too? Because I find they are more suave and convincing in terms of rendering timbral detail, which I really love).