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'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
Besides having fun, you get to determine some facts about their condition. That is quite a lot. 🙂
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.
Nope. You need to spend some on a microphone plus adequate mount, a cable and an usb audio interface. Chosen wisely you’d get it for around 100€. And you’d have to install REW of something like it.
Unmonting the drivers completed. Rubbers/foam looks good from the outside but could be worn out internally....don't know....
Well, put them back in then…
As far as I understand KEF adjusted each crossover individually on each reference speaker. They did that by correcting for the deviations from nominal part values.
As far as I understand KEF adjusted each crossover individually on each reference speaker. They did that by correcting for the deviations from nominal part values.
Ok so I will never be able to know what the deviations from the nominal was when they picked these caps from the shelf.
Thx...thats a nice resource but what I probably will end up doing is replacing the caps. Buy some additional resistors and listen to them. Changing the setup is easy enough as these pcb's are large and they are difficult to f**k up....
That forum doesn't look good at the moment. Last post dated november 2022. No replies on emails from the administrator......