Apparently (forgot where I read this), in the move from HE to SE, Tannoy finally started using more "audiophile-approved" parts inside the Prestige line of speakers. The internal wiring is done in Acrolink copper, which is high-end cabling from Japan (in fact the supplied binding post jumpers are also Acrolink). I think they're using higher end parts in the crossovers too, though I'm not sure what exactly that entails. Not sure if there are changes to the actual driver and/or crossover designs.
The HE apparently stood for "Hard Edge", which IIRC refers to the drivers' surround (the SE versions maintain this same surround).
The HE apparently stood for "Hard Edge", which IIRC refers to the drivers' surround (the SE versions maintain this same surround).