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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: Yet another 105 recap question
audiolabtower

Replies: 2
Views: 34

PostForum: KEF Speakers from the 1970s   Posted: Sat Dec 14, 2019 2:48 pm   Subject: Yet another 105 recap question
For what it's worth these were my values when I replaced the caps after about 8 years from new for polyester and polypropelene (not recommended without extra resistance to compensate for the elecs ESR ...
  Topic: Advice please on Celeste IV SP1145
audiolabtower

Replies: 2
Views: 277

PostForum: KEF Speakers from the 1970s   Posted: Sat Dec 07, 2019 1:12 pm   Subject: Advice please on Celeste IV SP1145
The grill is a sock and from what I remember the top plastic cover comes off, tight interference fit, and then you can roll the sock down to reveal the drive units to take the 8in unit out to get to t ...
  Topic: Cross over SP2010A
audiolabtower

Replies: 2
Views: 252

PostForum: KEF speakers   Posted: Wed Nov 13, 2019 1:49 pm   Subject: Cross over SP2010A
There is a traced crossover here

http://techtalk.parts-express.com/forum/tech-talk-forum/53931-why-mini-monitors

I can't vouch for accuracy though, but SpeakerGuru would know.
  Topic: Can i Just say...
audiolabtower

Replies: 5
Views: 376

PostForum: KEF speakers   Posted: Sat Nov 09, 2019 3:03 pm   Subject: Can i Just say...
I think that Guru knows more about the design than anyone??... Wink Smile
  Topic: Can i Just say...
audiolabtower

Replies: 5
Views: 376

PostForum: KEF speakers   Posted: Fri Nov 08, 2019 12:52 pm   Subject: Can i Just say...
I think Kef used to say 50W min but frankly they were very efficient at 93dB/Watt and an easy load, so I'm not surprised, particularly if you have a 4 ohm tap on your output.
  Topic: 104/2 low sound level
audiolabtower

Replies: 4
Views: 1931

PostForum: KEF speakers   Posted: Wed Oct 23, 2019 5:01 pm   Subject: 104/2 low sound level
If it's just the bass it could be a leak in the surrounds or doughnuts, but I would have thought the treble would be unaffected so the result would be just too bright?
  Topic: 104/2 low sound level
audiolabtower

Replies: 4
Views: 1931

PostForum: KEF speakers   Posted: Wed Oct 23, 2019 4:58 pm   Subject: 104/2 low sound level
Swappimg the speakers confirms it is the specific speaker and no other component. The 104.2s have conjugate load matching components which make the crossover look complicated, the extra components pro ...
  Topic: Actively driving a KEF R107
audiolabtower

Replies: 13
Views: 11037

PostForum: KEF speakers   Posted: Tue Jul 09, 2019 12:16 pm   Subject: Actively driving a KEF R107
mourn the near extinction of the sealed box speaker in the modern hifi scene).

Today efficiency thus LOUDNESS (and maybe some bass boom) is everything ! Laughing
  Topic: Actively driving a KEF R107
audiolabtower

Replies: 13
Views: 11037

PostForum: KEF speakers   Posted: Mon Jul 08, 2019 8:22 pm   Subject: Actively driving a KEF R107
Actually any rumble filtering was a secondary effect. The purpose of the capacitor was to interact with the inductance of the coil and other components to achieve the efficiency of a reflex design (ma ...
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 12
Views: 7535

PostForum: KEF Speakers from the 1970s   Posted: Mon Dec 31, 2018 3:53 pm   Subject: KEF 105.1 Refurbishment
One point if you want to be ultra exacting. The bass cabinets originally had a thick layer of black foam on top, up to the level of the veneered sides. This was there to minimise midrange reflections ...
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 12
Views: 7535

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 29, 2018 6:11 pm   Subject: KEF 105.1 Refurbishment
Excellent.
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 12
Views: 7535

PostForum: KEF Speakers from the 1970s   Posted: Thu Nov 29, 2018 5:15 pm   Subject: KEF 105.1 Refurbishment
Try 12in gaskets, or more easily I guess those windows sealing strips with the close cell foam.
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 12
Views: 7535

PostForum: KEF Speakers from the 1970s   Posted: Wed Nov 28, 2018 11:59 pm   Subject: KEF 105.1 Refurbishment
That might explain any bass difference? Check the baffle sealing foam strip, B300 sealing gasket, internal edges, speaker cable tube glueing, binding post mounting tightness etc etc?
  Topic: KEF 105.1 Refurbishment
audiolabtower

Replies: 12
Views: 7535

PostForum: KEF Speakers from the 1970s   Posted: Wed Nov 28, 2018 3:37 pm   Subject: KEF 105.1 Refurbishment
Excellent looking job, always nice to see classic speakers of that age looking good as new. Are the bass cabinets well sealed? Unpowered, pushing the coil of the B300 in gently by hand they should tak ...
  Topic: KEF 105 vs 105/2
audiolabtower

Replies: 43
Views: 22192

PostForum: KEF Speakers from the 1970s   Posted: Sun Nov 04, 2018 3:28 pm   Subject: KEF 105 vs 105/2
Yes my boards are most certainly screen printed as SP1100. I have seen pictures of that screw back head arrangement but never seen one. I did find a picture of a crossover "kit" which is sim ...
 
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