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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: Kefkit-ish - Scrap, improve or replace
Wiesiek Lipowski

Replies: 4
Views: 254

PostForum: DIY with KEF drive units   Posted: Fri Nov 09, 2018 10:21 am   Subject: Kefkit-ish - Scrap, improve or replace
You can use a Linn Isobarik crossover as the tweeter there was a Scanspeak 2008 as I remember. I did that when building half-Isobaricks for my son some years ago and then I bought the inductors from ...
  Topic: Cambridge TL-200
Wiesiek Lipowski

Replies: 26
Views: 14656

PostForum: Other speakers   Posted: Sun Jun 11, 2017 8:40 am   Subject: Cambridge TL-200
Just look here.
http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=980&sid=a3e33208fe74d3290ae54be64000a184
  Topic: kEF Concerto - new member - crossover upgrade advice
Wiesiek Lipowski

Replies: 3
Views: 3750

PostForum: KEF Speakers from the 1970s   Posted: Wed Jan 13, 2016 2:39 pm   Subject: kEF Concerto - new member - crossover upgrade advice
The concerto x-over looks like this:

http://www.hifiloudspeakers.info/Anatomy/SpeakerSystems/Concerto/ConcertoCrossoverSchematic.jpg
  Topic: Correction to split/moved thread
Wiesiek Lipowski

Replies: 3
Views: 3258

PostForum: KEF speakers   Posted: Wed Jun 24, 2015 3:32 pm   Subject: Correction to split/moved thread
Are humidity packets inside the cabinets a good idea? I've got a DIY pair of Q55.2 and would like to save the tweeters.
  Topic: Concerto Crossovers
Wiesiek Lipowski

Replies: 12
Views: 9954

PostForum: KEF Speakers from the 1970s   Posted: Wed Apr 22, 2015 9:19 am   Subject: Concerto Crossovers
Do you mean R1=1,5R and C1=100uF?
Yes, I have.

I have just added a 8R/15uF at the crossover bass output. I did not alter the original values of the PRO9TL crossover, so the C1=80uF is still ther ...
  Topic: Concerto Crossovers
Wiesiek Lipowski

Replies: 12
Views: 9954

PostForum: KEF Speakers from the 1970s   Posted: Tue Apr 21, 2015 6:12 pm   Subject: Concerto Crossovers
Thanks.

So I think I will also try to do some listening tests.

Fortunately the x-overs of my PRO9TL's are outside.
  Topic: Concerto Crossovers
Wiesiek Lipowski

Replies: 12
Views: 9954

PostForum: KEF Speakers from the 1970s   Posted: Tue Apr 21, 2015 3:30 pm   Subject: Concerto Crossovers
I mean just the bass section. I followed the advivce as per over here http://www.trueaudio.com/st_zobel.htm
and the data in the B139 leaflet.
  Topic: Concerto Crossovers
Wiesiek Lipowski

Replies: 12
Views: 9954

PostForum: KEF Speakers from the 1970s   Posted: Tue Apr 21, 2015 1:13 pm   Subject: Concerto Crossovers
Hi Andrew,

What cap and resistors values did you apply over there? Regards,
  Topic: Concerto Crossovers
Wiesiek Lipowski

Replies: 12
Views: 9954

PostForum: KEF Speakers from the 1970s   Posted: Fri Apr 17, 2015 1:43 pm   Subject: Concerto Crossovers
Why don't you try adding z Zobel to the B139's?

8R+15uF shunt at the speakers or x-overs can make the male and female vocals less bassy.
  Topic: IMF Compact speakers
Wiesiek Lipowski

Replies: 2
Views: 2459

PostForum: Other speakers   Posted: Thu Nov 20, 2014 7:51 pm   Subject: IMF Compact speakers
You can find some info over here:

http://www.imf-electronics.com/Home/imf/speaker-range/compacts#TOC-The-Compact
  Topic: Good old B139's gliceryn treatment
Wiesiek Lipowski

Replies: 2
Views: 2571

PostForum: KEF Speakers from the 1970s   Posted: Thu Oct 10, 2013 12:13 am   Subject: Good old B139's gliceryn treatment
That's what I come across on another website:

http://www.diyaudio.com/forums/multi-way/243413-kef-b139-sp1044-fs-43hz.html

What do you think, dudes?
  Topic: IMF ALS40
Wiesiek Lipowski

Replies: 13
Views: 8151

PostForum: Other speakers   Posted: Sun Dec 30, 2012 10:27 am   Subject: IMF ALS40
Please look here:

http://www.imf-electronics.com/Home/imf/speaker-range/studios/als40

Although they say "Tweeter : unknown; medium : unknown, bass: unknown", there is some info you mig ...
  Topic: Hello From Pigs
Wiesiek Lipowski

Replies: 24
Views: 14885

PostForum: Linn Kan, Isobarik and others   Posted: Thu Nov 17, 2011 11:43 pm   Subject: Hello From Pigs
Thank you. The forum seems rather dead though, which is a shame as it's an all right idea. But who knows, maybe it's about to go bananas! :0)

Do you still think the forum seems rather dead?
  Topic: KEF Q65 Crossover circuit
Wiesiek Lipowski

Replies: 1
Views: 2452

PostForum: KEF speakers   Posted: Thu Oct 20, 2011 10:18 pm   Subject: KEF Q65 Crossover circuit
Hi - You have PM.

Wiesiek
  Topic: new member - recent ebay purchase - any info appreciated
Wiesiek Lipowski

Replies: 22
Views: 20190

PostForum: KEF Speakers from the 1970s   Posted: Fri Dec 24, 2010 9:39 am   Subject: new member - recent ebay purchase - any info appreciated
Hello Mr Hall

I myself built a pair of PRO9 TL back in 1977 and still have them. I remember Nippro Accoustics adverts in a monthly HiFi Answers, that I loved reading so much.
However, I made some ...
 
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