I haven't heard the GRF90, but was very interested and almost went that way instead of Canterbury GR. It's hard to find anyone with good experience in Tannoy, so I'll pitch in again.
On paper, and given the sonic descriptions I've read on these, the GRF90 very much looks like a refined version of the Yorkminster SE (vastly improved cosmetics too). The GRF90 is really a GRF in name only (no horn loading). Some years ago I tried the Yorkminster SE in my room -- excellent speaker, but missing a bit of the lushness and magic in the midrange vs. the Kensington and especially Canterbury models. So yes, that makes these more like the Kindgom Royal or Churchill. I've heard both of those speakers too, but not in my room. The bass of the Yorkminster was especially exceptional and extended compared to the Canterbury -- but this might make it problematic for smaller rooms.
I love my Rogue Apollos with Canterbury, and it was also very good with Yorkminster, but the midrange was slightly on the hard side. Killer bass response and dynamics, though. Either they've fixed this is on the GRF90 or you'd want to go for a tube amp with a slightly more romantic midrange. To that end, the owners of the Churchills and Kingdom Royals were both using VAC tube amps. I feel you'll sacrifice a little on bass impact and extension by going that route, though. You don't want to sacrifice too much on the low end & dynamics of these speakers though, because it is quite fantastic.
The Canterbury GR was a big improvement on the SE and I've very happy I went that route, though I'm still curious how they've taken forward the Yorkminster/GRF90 design.
On paper, and given the sonic descriptions I've read on these, the GRF90 very much looks like a refined version of the Yorkminster SE (vastly improved cosmetics too). The GRF90 is really a GRF in name only (no horn loading). Some years ago I tried the Yorkminster SE in my room -- excellent speaker, but missing a bit of the lushness and magic in the midrange vs. the Kensington and especially Canterbury models. So yes, that makes these more like the Kindgom Royal or Churchill. I've heard both of those speakers too, but not in my room. The bass of the Yorkminster was especially exceptional and extended compared to the Canterbury -- but this might make it problematic for smaller rooms.
I love my Rogue Apollos with Canterbury, and it was also very good with Yorkminster, but the midrange was slightly on the hard side. Killer bass response and dynamics, though. Either they've fixed this is on the GRF90 or you'd want to go for a tube amp with a slightly more romantic midrange. To that end, the owners of the Churchills and Kingdom Royals were both using VAC tube amps. I feel you'll sacrifice a little on bass impact and extension by going that route, though. You don't want to sacrifice too much on the low end & dynamics of these speakers though, because it is quite fantastic.
The Canterbury GR was a big improvement on the SE and I've very happy I went that route, though I'm still curious how they've taken forward the Yorkminster/GRF90 design.