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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: Cs7 with BD139 passive radiator for deeper bass?
SaSi

Replies: 7
Views: 1086

PostForum: DIY with KEF drive units   Posted: Tue Aug 27, 2019 5:08 pm   Subject: Cs7 with BD139 passive radiator for deeper bass?
The Falcon B139 chassis dimensions are identical to the original later version KEF SP1044 with an extra 25mm chassis depth to allow for greater power handling ( now 150W), helped by the provision of a ...
  Topic: Cs7 with BD139 passive radiator for deeper bass?
SaSi

Replies: 7
Views: 1086

PostForum: DIY with KEF drive units   Posted: Fri Aug 23, 2019 3:49 pm   Subject: Cs7 with BD139 passive radiator for deeper bass?
You can get a rough idea of what to expect in terms of woofer response using one of the many simulation programs around. I am still using Winisd Pro (alpha version).

The CS7 is not rolling off bas ...
  Topic: Actively driving a KEF R107
SaSi

Replies: 13
Views: 6047

PostForum: KEF speakers   Posted: Tue Jul 02, 2019 11:51 am   Subject: Actively driving a KEF R107
It has been some time since I posted this and I thought I should bring in an update.

I finally decided to go the easy way and get a more powerful amplifier. It was not really a plan, but when I st ...
  Topic: KEF 105 Issues
SaSi

Replies: 4
Views: 1794

PostForum: KEF Speakers from the 1970s   Posted: Wed Oct 10, 2018 5:43 pm   Subject: KEF 105 Issues
For an MkI version, the age is such that capacitors may have drifted seriously. I've had with a Calinda and 104 pair that sounded muffled. Some capacitors had drifted by more than 50-60%.

So, sinc ...
  Topic: 105.2 clone with T33 tweeters?
SaSi

Replies: 22
Views: 7585

PostForum: DIY with KEF drive units   Posted: Mon Jul 16, 2018 6:46 pm   Subject: 105.2 clone with T33 tweeters?
I have a circuit diagram of an active xo for the R105.2 and also a graph of the frequency response printed on KEF "stationary" naming circuit EE28/A/1 issue 2 with a date of 6.1.82 and signe ...
  Topic: 105.2 clone with T33 tweeters?
SaSi

Replies: 22
Views: 7585

PostForum: DIY with KEF drive units   Posted: Tue Jul 10, 2018 9:33 pm   Subject: 105.2 clone with T33 tweeters?
Intrigued to read you are adding ferrofluid to the T27. It was not designed to use ferrofluid. The addition may spoil the sound or may tame it a bit, as many complain it's rather bright.

For the 1 ...
  Topic: 105.2 clone with T33 tweeters?
SaSi

Replies: 22
Views: 7585

PostForum: DIY with KEF drive units   Posted: Sun Jun 24, 2018 11:03 am   Subject: 105.2 clone with T33 tweeters?
Speaking of "emulating" the design, there can be much more flexibility in the design.
One aspect that one should consider is that Falcon acoustics offer brand new B1110 SP1003 and T27 SP10 ...
  Topic: What idiot decided to cut a hole in these?
SaSi

Replies: 5
Views: 2650

PostForum: KEF Speakers from the 1970s   Posted: Sat May 26, 2018 5:24 pm   Subject: What idiot decided to cut a hole in these?
Oh my!
I bet the guy is also proud of what they did.
I ran a simulation on WinISD just to see how the response would change by a (guesswork) 5cm port 10cm long.
It would create a 1-1.5dB bump at a ...
  Topic: Bringing the 105.2 back to life
SaSi

Replies: 10
Views: 7771

PostForum: KEF Speakers from the 1970s   Posted: Wed May 23, 2018 7:58 pm   Subject: Bringing the 105.2 back to life
I brought back to life a pair of 105 original version. They sounded like I'd never put them aside. But then came the 107. I like the tightness and richness of the upright bass more on the 107. But the ...
  Topic: KEF Tweeter equivalency table
SaSi

Replies: 5
Views: 1599

PostForum: DIY with KEF drive units   Posted: Tue May 08, 2018 7:50 pm   Subject: KEF Tweeter equivalency table
OK, so it looks like for the coaxial tweeters, naming came from the VC size where for all other drivers, it came from the dome or cone size.
  Topic: KEF Tweeter equivalency table
SaSi

Replies: 5
Views: 1599

PostForum: DIY with KEF drive units   Posted: Fri May 04, 2018 9:16 pm   Subject: KEF Tweeter equivalency table
The NT19 name comes from the size, in the same way as B200 means bass unit 200mm and B160 means the same but for 160mm.

Replacing an NT25 with an NT19 may be a bit adventurous or not. You may have ...
  Topic: KEF Tweeter equivalency table
SaSi

Replies: 5
Views: 1599

PostForum: DIY with KEF drive units   Posted: Fri May 04, 2018 8:41 pm   Subject: KEF Tweeter equivalency table
Hi, I'm trying to compile a list, rather a cross reference between SP numbers and descriptions as well as systems in which they were used. As far as real specs and equivalences, that's rather tough to ...
  Topic: Uni-Fi
SaSi

Replies: 0
Views: 2751

PostForum: Other speakers   Posted: Sun Apr 08, 2018 10:32 am   Subject: Uni-Fi
You may know that Andrew Jones, formerly with KEF, after a brief stint with Pioneer, moved on to ELAC.

I just saw they offer a new range of loudspeakers, sporting a concentric / coaxial midrange/t ...
  Topic: Replacement tweeters for R107: Matching
SaSi

Replies: 4
Views: 1840

PostForum: KEF speakers   Posted: Sun Apr 08, 2018 7:36 am   Subject: Replacement tweeters for R107: Matching
What happened to the original tweeters? If they only have hardened / dried ferrofluid, that's a relatively easy fix that's totally feasible. And you keep the original "character" of the loud ...
  Topic: Calling SpeakerGuru: KEF Reference 103.4 - cooked B160's
SaSi

Replies: 5
Views: 2030

PostForum: KEF speakers   Posted: Tue Mar 27, 2018 4:59 pm   Subject: Calling SpeakerGuru: KEF Reference 103.4 - cooked B160's
Just to bring an example, I re-created a pair of 107s only having the domes and original crossovers. I didn't have the boxes as the previous owner threw them away after a flood. Sad

I created draw ...
 
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