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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: Russ Andrews crossover design
RGBE

Replies: 40
Views: 20398

PostForum: KEF Speakers from the 1970s   Posted: Fri May 24, 2013 7:26 pm   Subject: Russ Andrews crossover design
One of the most intriguing points of audio reproduction is the individual tolerance to sound coloration.

Some people seem to be inmune to astonishing degrees of it. They listen happily to music ho ...
  Topic: Russ Andrews crossover design
RGBE

Replies: 40
Views: 20398

PostForum: KEF Speakers from the 1970s   Posted: Mon May 20, 2013 1:22 pm   Subject: Re: Sound reproduction in the home will always be a compromi
This is what I did mean with reference. When recording has been made, the producer most likely will like some kind of balance when the mixing is made............

But, what speakers is the producer ...
  Topic: Which enclosure or open baffle is ideal for a KEF B110?
RGBE

Replies: 5
Views: 4887

PostForum: DIY with KEF drive units   Posted: Thu May 16, 2013 2:03 pm   Subject: Re: Which enclosure or open baffle is ideal for a KEF B110?


Google "Dahlquist" loudspeakers, their first offering looked like electrostatics with the grille on. They were all on an open baffle.

I know, I know... I even have a pair of the 5&qu ...
  Topic: Russ Andrews crossover design
RGBE

Replies: 40
Views: 20398

PostForum: KEF Speakers from the 1970s   Posted: Thu May 16, 2013 1:35 pm   Subject: Russ Andrews crossover design
There are many drive units that would be unacceptable without a sophisticated crossover correction, for instance, and forgive me, the KEF B110A SP1003. I find the sound of this speaker unbearable wit ...
  Topic: Which enclosure or open baffle is ideal for a KEF B110?
RGBE

Replies: 5
Views: 4887

PostForum: DIY with KEF drive units   Posted: Mon May 13, 2013 1:17 pm   Subject: Which enclosure or open baffle is ideal for a KEF B110?
That short TL mid-range enclosure is ingenious, but frankly I doubt about its sonic virtues at the relatively high frequencies involved. In my opinion, what makes it sound so open and uncolored is ra ...
  Topic: Which enclosure or open baffle is ideal for a KEF B110?
RGBE

Replies: 5
Views: 4887

PostForum: DIY with KEF drive units   Posted: Thu May 09, 2013 7:25 pm   Subject: Which enclosure or open baffle is ideal for a KEF B110?
Which would be the ideal enclosure or open baffle for a KEF B110 used as mid range speaker? I mean without considering size, cost, esthetics or convenience.

I recall now the mid enclosures that Jo ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Sun May 05, 2013 7:01 pm   Subject: Re: B139 in closed box
Yes, they would have been very similar. Changing the voice coil impedance makes very minor changes to the "Theile-Small" parameters apart from scaling everything for impedance.
Then, may be ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Sun May 05, 2013 1:36 pm   Subject: Re: B139 Variants?
This will add to the confusion then....

Oh my God!
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Sat May 04, 2013 6:57 pm   Subject: My B139 sound dry and congested in 43 liter enclosures
I have found this Online Loudspeaker Enclosure Calculation. Do you think it is of any practical use?

http://imageshack.us/a/img28/5377/b139small.gif
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Fri Apr 26, 2013 7:33 pm   Subject: My B139 sound dry and congested in 43 liter enclosures
I don't know what you've read but I do know that what you've described is not possible.

Oh, it was too easy to be true!
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Fri Apr 26, 2013 7:30 pm   Subject: Re: B139 in closed box
If I have the time in the next few days I shall enter the driver parameters and run a couple of simulations for the two enclosure volumes. Assuming I can find the software... Smile
Oh, many thanks! Th ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Fri Apr 26, 2013 7:27 pm   Subject: Re: B139 in closed box
47L using the B139 SP1212 4Ω driver.
C80: http://listeninn.com/Website/Used-Speakers/KEF-C80-Info.htm
[/quote]

I would be very happy to know that the C80 volume was 47 liters -very close to ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Fri Apr 26, 2013 7:07 pm   Subject: Re: B139 in closed box
Closed box LF alignment for B139/SP1044 seems to be quite optimal with Cantata internal volume. Even with 40 years old drive units........

That's why I can't understand KEF recomending 30-40 liters ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Thu Apr 25, 2013 7:29 pm   Subject: My B139 sound dry and congested in 43 liter enclosures
audiolabtower Many thanks, I think you are right and my system volume is too small. But KEF in its B139 data sheet recomends a volume of 30-40 liters for totally enclosed box, thow the CS7 closed vol ...
  Topic: My B139 sound dry and congested in 43 liter enclosures
RGBE

Replies: 18
Views: 14325

PostForum: DIY with KEF drive units   Posted: Thu Apr 25, 2013 7:15 pm   Subject: My B139 sound dry and congested in 43 liter enclosures
speakerguru, many thanks for your very kind offer but, unfortunately, I don't know much about electronics and would not be able to measure the parameters you require and even less build an "opamp ...
 
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