Very good point and interesting concern raised by @mijostyn .
A 1st order 850 Hz high pass will send an awful lot of energy to the tweeter. By comparison, the big Tannoys had a 2nd order 1100 Hz high pass. Their 2" compression tweeters had 2" round wire voice coils to help dissipate the heat. The Fyne has a 3" compression tweeter (and I assume coil?) so all else equal that can handle more power. For sure, the Tannoys are robust but if something goes bad it’s going to be the compression tweeter from either overdriving, manufacturing defect, or a combo of both. I had a tweeter start to go slightly noisy/distorted in Kensington SE. It wasn’t a catastrophic failure; really subtle and only barely noticeable in specific scenarios, but it’s a good idea to have spare tweeters on hand - they’re relatively affordable and easy to replace here.
Cabinet wise the Fynes follow the Tannoy Definition line - contemporary curved cabinets with rear reflex porting. The focus is more on styling and bracing/rigidity than cabinet air volume. To be quite honest this line never gelled with me sonically. The Prestige line is front vented, not reflex ported, and always seemed to have a richer midrange with a better musical balance. Not sure how much of that difference is from the porting, but I can have my suspicions. The starkest contrast of these cabinets is Definition 10A versus Kensington SE, both with the the same 10" driver. I did not like the 10A at ALL. Bright, lean, aggressive.