Here is what KEF in the UK had to say on the topic:
Dear Mr Schubert
The correct way to do this would be to solder the wires onto the crossover,
however this does involve removing the bottom panel. The easiest way would
be either to remove the front plate from the tweeter and solder the
existing wires direct to the tweeter. This would probably be a 2 handed
job. The other alternative would be to splice the new tweeter wires top the
existing wires.
Any mutlicore type solder will suffice, but only heat it enough to briefly
melt the solder long enough. to attach the wire.
Regards
Clive Pitt
Service Department Manager
KEF AUDIO (UK) Limited / Celestion Consumer Division
Dear Mr Schubert
The correct way to do this would be to solder the wires onto the crossover,
however this does involve removing the bottom panel. The easiest way would
be either to remove the front plate from the tweeter and solder the
existing wires direct to the tweeter. This would probably be a 2 handed
job. The other alternative would be to splice the new tweeter wires top the
existing wires.
Any mutlicore type solder will suffice, but only heat it enough to briefly
melt the solder long enough. to attach the wire.
Regards
Clive Pitt
Service Department Manager
KEF AUDIO (UK) Limited / Celestion Consumer Division