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This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
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  Topic: Sourcing Kef T52 or good alternative.
DrBoar

Replies: 3
Views: 3298

PostForum: KEF Speakers from the 1970s   Posted: Mon Feb 24, 2014 10:56 pm   Subject: Sourcing Kef T52 or good alternative.
The crossover in the 105/II is a pretty straigt forward 3 order with a RC link and a very small serial coil. My guess is that many 1" drivers would do but a 1.2" like the Seas http://www.eu ...
  Topic: B200 SP1070 8 ohms
DrBoar

Replies: 14
Views: 12545

PostForum: DIY with KEF drive units   Posted: Sat Nov 23, 2013 9:37 pm   Subject: B200 SP1070 8 ohms
with regard to zobel. Use the data from an other B200 unit and calculat the Zobel network and use those values. Even with values quie far of the correct ones the zobel will flatten the impedance rise ...
  Topic: Foam surroud
DrBoar

Replies: 1
Views: 2375

PostForum: Other speakers   Posted: Sun Jun 09, 2013 2:38 pm   Subject: Foam surroud
http://www.goodhifi.com/
Very good service and cheap shipping to scandinavia all your qustions will be answered by their FAQ. Foams are not created equal!
  Topic: B200 1022 in Transmission line
DrBoar

Replies: 2
Views: 3274

PostForum: DIY with KEF drive units   Posted: Sun Jun 09, 2013 2:11 pm   Subject: B200 1022 in Transmission line
Changing drivers on a whim is seldom a good idea. However, the Dalesford drivers where "inspired" by the KEF B200 and B110 so they might be similar.

I would start with the B200 and listen ...
  Topic: Troubles with a pair of IMF TLS 50
DrBoar

Replies: 7
Views: 6826

PostForum: Other speakers   Posted: Tue Mar 05, 2013 8:01 am   Subject: Troubles with a pair of IMF TLS 50
Either listen to the tweeters at low to mid level with the tweeters connected using a decently large cap say 10-20µF, or at least turn the bass controll all the way down.

The sound should sound cle ...
  Topic: DN 13 crossover measured Dyaton Woofer Tester 3
DrBoar

Replies: 0
Views: 3025

PostForum: DIY with KEF drive units   Posted: Tue Dec 04, 2012 11:04 pm   Subject: DN 13 crossover measured Dyaton Woofer Tester 3
The low pass seem to do a small baffle step then some peak taming at 2 kHz. The high pass does a cutoff below 3.5 kHz some damping over all and then some peak removal at 6kHz??

http://i360.photobuc ...
  Topic: Measured T27
DrBoar

Replies: 0
Views: 2708

PostForum: DIY with KEF drive units   Posted: Tue Dec 04, 2012 10:59 pm   Subject: Measured T27
Measured some old T27 just the TS not the frequency response

http://i360.photobucket.com/albums/oo41/DrBoar/KEF%20Drivers/T27-1.png
  Topic: Measured B200 SP1014
DrBoar

Replies: 0
Views: 2679

PostForum: DIY with KEF drive units   Posted: Tue Dec 04, 2012 10:55 pm   Subject: Measured B200 SP1014
I have measured these
http://i360.photobucket.com/albums/oo41/DrBoar/KEF%20Drivers/KEFB200-SP1014.jpg

Frequency response as measured in a box using XTZ Room Analyzer II at a distance of about 50 c ...
  Topic: Good design for a B200 SP1014?
DrBoar

Replies: 0
Views: 2509

PostForum: DIY with KEF drive units   Posted: Sun Dec 02, 2012 8:42 pm   Subject: Good design for a B200 SP1014?
I have SP1014 and T27 driver ( and many many more tweeters). Now I need some ideas about what to do with the drivers. A small TLS like the IMF 50 is one an other is doing something along the Spendor ...
  Topic: transmission line cabinets for kef b139
DrBoar

Replies: 6
Views: 7433

PostForum: DIY with KEF drive units   Posted: Fri Nov 30, 2012 8:35 am   Subject: transmission line cabinets for kef b139
This shows the DIY damping of a IMF80 inspired loudspeaker.
Gullfiber= fiber glass brand
Eternit=brand of asbestos board! Do use a safe material
Fårull= sheep wool.

http://i360.photobucket.com/ ...
  Topic: Aging of B200 SP1014
DrBoar

Replies: 3
Views: 5336

PostForum: KEF speakers   Posted: Sun Sep 09, 2012 9:21 pm   Subject: Aging of B200 SP1014
I am confident about the setup. Various speakers from vintage Philips 9710 to straight out of the box Eminence Omega 15A and Beyma 6" drivers are spot on. And yes 25 Hz is from the spec sheet.
...
  Topic: Aging of B200 SP1014
DrBoar

Replies: 3
Views: 5336

PostForum: KEF speakers   Posted: Wed Sep 05, 2012 8:46 am   Subject: Aging of B200 SP1014
I have some really old B 200
http://i360.photobucket.com/albums/oo41/DrBoar/KEF%20Drivers/KEFB200-SP1014.jpg

Despite some exersise the Fr and Q has increased. From 25 to 40 Hz.
Measured using Day ...
  Topic: bitumen sheets for panel dampening
DrBoar

Replies: 16
Views: 12861

PostForum: DIY with KEF drive units   Posted: Thu Feb 04, 2010 9:40 pm   Subject: bitumen sheets for panel dampening
Bitomen increase mass but not stiffness so the resonance frequency has to go down. Used by Spendor and LS3/5A where the midrange is the holy grail.

The price to pay is a more resonanses in high bas ...
  Topic: Crossover conversion from 4 to 3 speakers
DrBoar

Replies: 2
Views: 2732

PostForum: DIY with KEF drive units   Posted: Sun May 31, 2009 7:19 pm   Subject: Crossover conversion from 4 to 3 speakers
You can skip the B139 terminals and just run the B110. The problem is that the B110 when used as a midrange also have a highpass filter in the crossover that will cut away all the bass!

Plugging in ...
  Topic: 105.2 cabinet damping
DrBoar

Replies: 18
Views: 8937

PostForum: KEF Speakers from the 1970s   Posted: Wed Mar 04, 2009 9:54 pm   Subject: 105.2 cabinet damping
Crossbraces in the basscabinet will stffen the walls as well as give some damping. Stiff enough they have their resonces above the working range of the cabinet and will then not be set in motion!

S ...
 
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