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Hi everyone. New member with a couple of questions....

 
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pete the bus
Junior Contributor 10+


Joined: 30 Apr 2008
Posts: 15
Location: East Kent

PostPosted: Fri May 02, 2008 1:49 pm    Post subject: Hi everyone. New member with a couple of questions.... Reply with quote

Hi all...
Been searching the interweb for info on a few Hi-Fi rlated questions and came upon this site. Having read through a few posts I realised what an awful lot of knowledge is on hand here Very Happy .
I have a few questions to ask, firstly on here about my 104/2's, and later I will be posting on the "other speakers" forum, where I will post a picture of my other speakers which I think you will find very interesting! Shocked
Firstly, a couple of questions about my 104/2's...

1 - Identification/Year of Manufacture - Anyone know what year mine were made, and any info whether they would have been an early/later/updated/improved version?
The back label states : Type SP 3037
Serial number : 019208 and then a B

2 - Were these designed to be used with the grills on or off?

3 - Lower bass unit dust seals (doughnuts?). Mine have completely perished - will this be an issue? If so, is it a DIY or a specialist repair?

I'll leave it at that for now, dont want to seem too pushy with my first post!!! Embarassed

Regards
Peter
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suffolk2
Intermediate Contributor 50+


Joined: 30 Dec 2006
Posts: 59
Location: Suffolk,England

PostPosted: Fri May 02, 2008 7:12 pm    Post subject: Re: Hi everyone. New member with a couple of questions.... Reply with quote

pete the bus wrote:
Hi all...
Been searching the interweb for info on a few Hi-Fi rlated questions and came upon this site. Having read through a few posts I realised what an awful lot of knowledge is on hand here Very Happy .
I have a few questions to ask, firstly on here about my 104/2's, and later I will be posting on the "other speakers" forum, where I will post a picture of my other speakers which I think you will find very interesting! Shocked
Firstly, a couple of questions about my 104/2's...

1 - Identification/Year of Manufacture - Anyone know what year mine were made, and any info whether they would have been an early/later/updated/improved version?
The back label states : Type SP 3037
Serial number : 019208 and then a B

2 - Were these designed to be used with the grills on or off?

3 - Lower bass unit dust seals (doughnuts?). Mine have completely perished - will this be an issue? If so, is it a DIY or a specialist repair?

I'll leave it at that for now, dont want to seem too pushy with my first post!!! Embarassed

Regards
Peter


i am not technically minded, thou some on here are brilliant !!

i would say :

1 - ring Kef and they should help you with that, not sure if there is
a published list on serial nos. manufacture dates [ i know naim has ]

2 - either, thou i tend to listen with mine off.

3 - dust caps do not affect the sound only visually. its prob a specialist
area as you need to find out who supplies them. i use a pair of speakers
without dust caps and it doesn't bother me the slightest Very Happy as far as i
know they are only glued on.
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speakerguru
VIP Contributor 750+


Joined: 18 Nov 2005
Posts: 958
Location: Green Hut, Tovil

PostPosted: Sat May 03, 2008 10:49 am    Post subject: Re: Hi everyone. New member with a couple of questions.... Reply with quote

pete the bus wrote:

3 - Lower bass unit dust seals (doughnuts?). Mine have completely perished - will this be an issue? If so, is it a DIY or a specialist repair?


The way I read this, I think the you mean the inner surrounds from cone to the centre pole of each woofer. If so, then they serve the purpose of sealing the path from the front to the back of the cone allbeit via the voice coil gap in the magnet. This front-to-back leak affect the mechanical Q of the woofer and therefore the acoustic alignement of the coupled cavity system, apart from possibly giving rise to "farty" noises at high bass levels. You should try to get these dustcaps/inner surrounds replaced although I don't know if KEF still have any. Start with their service dept. It should be OK to diy because the inner spider/suspension is still in place and takes care of the centering.
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pete the bus
Junior Contributor 10+


Joined: 30 Apr 2008
Posts: 15
Location: East Kent

PostPosted: Sat May 03, 2008 12:18 pm    Post subject: Re: Hi everyone. New member with a couple of questions.... Reply with quote

Yes, I do mean the inner surrounds. They were perished when I acquired them, the previous owner said it didnt affect the SQ. There are no farty noises with them, and they sound amazing to my ears (only running a 50W Quad 306 with them though, so never driven to really high volumes).
I am more worried that dust will get in and damage the voice coils, as I leave the grills off for long periods (months at a time sometimes!!!)
Peter
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suffolk2
Intermediate Contributor 50+


Joined: 30 Dec 2006
Posts: 59
Location: Suffolk,England

PostPosted: Sat May 03, 2008 11:37 pm    Post subject: Re: Hi everyone. New member with a couple of questions.... Reply with quote

pete the bus wrote:
Yes, I do mean the inner surrounds. They were perished when I acquired them, the previous owner said it didnt affect the SQ. There are no farty noises with them, and they sound amazing to my ears (only running a 50W Quad 306 with them though, so never driven to really high volumes).
I am more worried that dust will get in and damage the voice coils, as I leave the grills off for long periods (months at a time sometimes!!!)
Peter


dust will not stay on for long when the music starts Very Happy

as i say i run a pair without dust caps and without grills
and has been for years.......so dont worry unduly.
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IsakAlexander
Junior Contributor 10+


Joined: 05 Jan 2007
Posts: 18
Location: Norway

PostPosted: Tue May 13, 2008 6:47 pm    Post subject: Reply with quote

A Kef doughnut search on ebay should give some result. Wink
and when you have changed the surrounds, leave the grille on as it
will increase the lifespan of foamsurrounds.
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RR105-3
Introductory Contributor


Joined: 13 Jul 2007
Posts: 5

PostPosted: Sun Jun 01, 2008 7:15 pm    Post subject: Re: Hi everyone. New member with a couple of questions.... Reply with quote

pete the bus wrote:
Hi all...

3 - Lower bass unit dust seals (doughnuts?). Mine have completely perished - will this be an issue? If so, is it a DIY or a specialist repair?



Regards
Peter



if the donuts are perished, the other outher rubber edges will be gone also
the donuts have a function, which is airclosure ...
and they can also fall apart in pieces, and these little pieces can get stuck between speaker-coils and the center-core .... Surprised

new "after-market" donuts can be aquired and installed, but remember, these donuts don't meet the specs from the original used materials ( Q-Factor) ....

after repair your speaker will function, but will not be a RR-104/2 anymore ... (out of spec's) Crying or Very sad Shocked

Kef had B200 replacement-units for my RR105/3's 5 years ago ..., so you better give them a call ...


succes .. Very Happy
_________________
history: 1978 RR104ab/1984 RR104-2 /1990 RR105-3
-------------------------------------------
in my posession at the moment
RR105-3/C60/C10/Chorale/Cresta's 1970 (2x) /B139-units
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ajswinscoe
Intermediate Contributor 25+


Joined: 25 May 2007
Posts: 26
Location: wigan

PostPosted: Fri Jun 13, 2008 6:15 pm    Post subject: Reply with quote

Outer rings and centre dust caps are defo available for 104/2 on ebay. Or visit www.goodhifi. These guys will fix you up with all need. And there is even a demo of how to do it.
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