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Damaged Kef Corelli Speakers

 
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tonyafan
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Joined: 01 Feb 2013
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Location: Port Talbot

PostPosted: Sat Feb 02, 2013 11:12 pm    Post subject: Damaged Kef Corelli Speakers Reply with quote

Hello Everyone
I am new on the forum and this is my first post.
I own a pair of Kef Corelli speakers which I purchased in the late seventies. One of the front covers was damaged a while ago and I decided to have an attempt at repairing it. When I removed the grill I noticed a small split (1.5cm) in the dope coating of the bass speaker . On inspecting the other speaker I found there was a small 1 cm square section of the coating missing on this speaker. Prior to this I had not noticed any problem with the sound from the speakers . I was wondering if this is a serious problem and if it can be repaired.
Thanks
Tony Adams
[img
DSCF3233 (2) by tonyafan, on Flickr][/img]
[img
DSCF3235 by tonyafan, on Flickr][/img]
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Sun Feb 03, 2013 2:20 pm    Post subject: Re: Damaged Kef Corelli Speakers Reply with quote

It is the PVA damping coming away from the Bextrene cone.
If I remember crrectly the late Colin did post advice on repair some time ago.
Perhaps a search on the forum may be worthwhile?
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tonyafan
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Joined: 01 Feb 2013
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Location: Port Talbot

PostPosted: Mon Feb 04, 2013 10:51 pm    Post subject: Reply with quote

Hello
Thanks for your reply. I have started to trawl through Colin's numerous posts.
He was very knowledgeable guy.
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proffski
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PostPosted: Tue Feb 05, 2013 9:17 am    Post subject: Reply with quote

Speaker Guru also had input regarding the subject.

Here: http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=562&highlight=whiite+belly
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I contend that for a nation to try to tax itself into prosperity is like a
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Wed Feb 06, 2013 11:10 pm    Post subject: Reply with quote

AFAICS from your photos the damage to the cones looks very serious. The bextrene seems to have split, probably all the way from the neck/voice coil joint.

I would suspect this was caused by a large LF transient/amplifier overload or possibly even by the speakers being dropped on their fronts and the large resulting shove on the cone from trapped air.

If you play them quietly then you might get away with it, but I'm sure a sine wave sweep would produce a rattle or buzzing.

Could you take the woofers out and post some photos of the cone neck-voice coil area to reveal the extent of the splits?
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tonyafan
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Location: Port Talbot

PostPosted: Mon Feb 11, 2013 12:25 am    Post subject: Reply with quote

Hello
Thanks for your replies.
When I took the left hand woofer out of the cabinet and run my hand around the inside of the cone the bextrene felt as if it is split. There appears to be a T shaped split going down to the neck. Probably too much for me to repair or replace. The right hand speaker even though it looks in worse condition appears not to be split but more of the coating as come away. It is difficult to take an clear photo of the damage but see below for photo of interior of left hand woofer. I will probably see if somebody wants to restore them as a project seems a waste to chuck them out.
Again thanks for your information




[img
P1000590 by tonyafan, on Flickr][/img]
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tonyafan
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PostPosted: Mon Feb 11, 2013 7:27 pm    Post subject: Reply with quote

I put the speakers back together and played some music on them at a quite high volume and to me they sound as good as my son's wharfedale diamonds. No obvious distortion or buzzing, So even though they look damaged they still sound Ok to me and the wife.
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speakerguru
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PostPosted: Mon Feb 11, 2013 11:26 pm    Post subject: Reply with quote

tonyafan wrote:
I put the speakers back together and played some music on them at a quite high volume and to me they sound as good as my son's wharfedale diamonds. No obvious distortion or buzzing, So even though they look damaged they still sound Ok to me and the wife.

Glad to hear they still sound OK. Maybe for peace of mind you could reinforce the splits with a little high-viscosity superglue or even tissue paper+PVA to avoid them getting any worse.
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tonyafan
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PostPosted: Tue Feb 12, 2013 8:57 pm    Post subject: Reply with quote

Thanks for that probably a way to stop deterioration
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