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rx7rotary
Intermediate Contributor 50+
Joined: 20 Feb 2012
Posts: 59
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 Posted: Mon Feb 22, 2016 12:41 pm Post subject: Kef 107 - opening the heads |
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Guys,
I have bought a pair of "like new" kef 107's with two different KUBES version 1, and version 2.
https://www.instagram.com/p/BCEhHQuv1f0/?taken-by=zlatibor031
Currently I am listening to them without the KUBE and would like to get onto re-capping the crossover. I have done much work on my 105.1, but the heads are different on these and I have unscrewed the back panel screws but the panel is not coming off.
Any suggestions?
Regards
mark |
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SaSi
Senior Contributor 200+
Joined: 24 Aug 2008
Posts: 256
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| Posted: Tue Feb 23, 2016 9:55 am Post subject: |
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Hi there,
they are "supposed" to come off once the screws are removed. Mine don't as well and I didn't want to break anything by forcing them.
It's possible that years of having the front and back sides of the heads pressed together has caused some stickiness. |
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speakerguru
Über Contributor 1000+
Joined: 18 Nov 2005
Posts: 1192
Location: Green Hut, Tovil
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| Posted: Wed Feb 24, 2016 11:57 am Post subject: |
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| The heads started life as two half shells, so they should come apart. If they are stuck, once all screws are removed, then using a lever in the support bracket slots should force them apart without causing visible damage. |
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ebf
Intermediate Contributor 25+
Joined: 08 Jun 2020
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| Posted: Tue Jul 07, 2020 6:28 pm Post subject: |
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Do one need to break the apart? Can't one get to the crossover just via removing the MF and HF elements? And maybe sneaking the crossover out via the MF hole? I haven't looked at this yet, but just guessing from seeing too much youtube and pictures  |
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SaSi
Senior Contributor 200+
Joined: 24 Aug 2008
Posts: 256
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| Posted: Wed Jul 08, 2020 10:32 am Post subject: |
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You will surely be able to look at the crossover with the drivers removed but if you wanted to do a repair (capacitor replacement, etc) to the crossover board, it would have to be removed from there and the only way to do that is break the heads apart.
Well, not literally break them, that would be a bad thing. That's why I was not keen to put any pressure to the shells to open them.
BTW, just one question: How many screws are there in the back? It may be I missed one and that may account for not being able to remove the back part. I know it appears pretty basic to look for the holes and the screws but you never know.  |
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speakerguru
Über Contributor 1000+
Joined: 18 Nov 2005
Posts: 1192
Location: Green Hut, Tovil
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| Posted: Wed Jul 08, 2020 11:37 am Post subject: |
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| SaSi wrote: | | BTW, just one question: How many screws are there in the back? It may be I missed one and that may account for not being able to remove the back part. I know it appears pretty basic to look for the holes and the screws but you never know. |
AFAICR the holes for the recessed screws are large and obvious. No hidden screws behind labels. There are also 2 small screws near the label at the bottom? Again photos would help. |
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ebf
Intermediate Contributor 25+
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Parts
Senior Contributor 100+
Joined: 13 Jan 2006
Posts: 181
Location: Edinburgh
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| Posted: Sat Jul 18, 2020 9:52 pm Post subject: |
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Been a long time, hope everyone is well.
Hope I am not too late but I am pretty sure you cannot split 107 heads, as they were lined with dampening?
I am sure it was poured and set unlike the bitumem pads adhered into old 105 assemblies.
Also, the spigot for the main pin cabinet pin, does that not bolt onto the two halfs?
I am ptetty sure you simply remove all foam and remove the crossover from there, I remember that as I rewired my 107 with Chord speaker cable which I have since regreted.
Should have stuck with the spade connectors and simple ofc copper. |
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speakerguru
Über Contributor 1000+
Joined: 18 Nov 2005
Posts: 1192
Location: Green Hut, Tovil
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| Posted: Mon Jul 20, 2020 10:04 pm Post subject: |
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| Parts wrote: | ...Hope I am not too late but I am pretty sure you cannot split 107 heads, as they were lined with dampening?
I am sure it was poured and set unlike the bitumem pads adhered into old 105 assemblies. ... |
Looking at the video and racking my brains, I think the answer is yes and no. Clearly the guy in the video has split it but I don't believe KEF ever intended it to be split after the Polyol filling of the wings. If you look at the crossover fixings you'll see that there are 4, 2 at the bottom and 2 in the middle. Crucially, none at the top. I think that means you can get the crossover board in and out via the B110 aperture after removing the driver and any lining.
p.s. in KEF engineering speak you never do any dampening to speakers - it makes them wet  
You damp resonances with damping material |
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ebf
Intermediate Contributor 25+
Joined: 08 Jun 2020
Posts: 25
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| Posted: Thu Jan 14, 2021 1:07 pm Post subject: |
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Just to confirm for others in the future.
On my KEF 107/2 - it is fully possible to get the crossover out via the B110 aperture.
No need to split the head, as in the crazy youtube video! |
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Huba Buba
Introductory Contributor
Joined: 09 Sep 2020
Posts: 6
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| Posted: Sun Mar 21, 2021 5:32 pm Post subject: |
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Hi, everyone,
I'm searching for information regarding the opening of the 107 head assemblies, but I can't seem to find what I'm looking for. My question is if it's possible to get the tweeter out of the assembly without opening it, i.e. through the aperture of the midrange after removing it?
Does anyone have experience removing the tweeter this way?
All the best,
- K |
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speakerguru
Über Contributor 1000+
Joined: 18 Nov 2005
Posts: 1192
Location: Green Hut, Tovil
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| Posted: Mon Mar 22, 2021 6:14 pm Post subject: |
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| Huba Buba wrote: |
I'm searching for information regarding the opening of the 107 head assemblies, but I can't seem to find what I'm looking for. My question is if it's possible to get the tweeter out of the assembly without opening it, i.e. through the aperture of the midrange after removing it? |
Every 105 and 107 head I have ever seen had the tweeter removeable and installable from the front. Do you not have the heads yet? The wire mesh grilles are a press fit into a groove, if that's what's confusing you. |
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rg
Introductory Contributor
Joined: 16 Nov 2021
Posts: 5
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| Posted: Thu Nov 18, 2021 4:25 pm Post subject: |
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| speakerguru wrote: | | Huba Buba wrote: |
I'm searching for information regarding the opening of the 107 head assemblies, but I can't seem to find what I'm looking for. My question is if it's possible to get the tweeter out of the assembly without opening it, i.e. through the aperture of the midrange after removing it? |
Every 105 and 107 head I have ever seen had the tweeter removeable and installable from the front. Do you not have the heads yet? The wire mesh grilles are a press fit into a groove, if that's what's confusing you. |
Yes the crossover is removable through the mid "hole". Be carful removing the mid as the attached wires may not have much slack, note the location of all the foam when removing, remove the tweeter, mid, and input wires, there are 4 screws with tiny washers that fasten the crossover. Also there is double sided sticky tape on the backside of the cross over at the top, so you have to wiggle the cover and get your fingers under to release the sticky tape. Some pics are attached here:
https://www.flickr.com/gp/194401210@N06/LuQ72h |
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