KEF Reference Model 3 refurbish questions

Hello gents,

I've got some KEF Reference Model 3's which I'd like to give some proper maintenance. These guys are amost 30 years old and I assume nothing has been done to them. Visually they look fine and the rubbers of the midrange/tweeter combo and woofer appear undamaged but that doesn't say much about the actual state of the material.
The 2 subs can not be visually inspected as they are mounted vertically inside the box.

I found a guy who is specialised in the KEF Reference and Q-series speakers in the Netherlands. I'm going to unmount all the drivers myself he is going to inspect them and redo the foams of the subs and maybe the rubbers of the woofer and midrange as well. He is also going to clean the tweeter magnet and redo the ferrofluid.

For the cross-overs I'm thinking of only replacing the caps taking into account the difference in ESR.....if possible at all

My questions are these. I do have the DATS V3 so this might be a very good moment to do the pre and after measurements measuring the free air parameters including the measurement with the added mass as well.

Would there be any use of measuring it besides the fun of measuring?

thx in advance

willem
 
I’d settle for no less than a level sweep or ‘frequency plot’ as that is the only thing that will tell you most you’d like to know. An impedance sweep is not really interesting, apart from low tuning and (absence of) resonances.
 
Unmonting the drivers completed. Rubbers/foam looks good from the outside but could be worn out internally....don't know....
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