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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: Hi-Fi News offer
BobL

Replies: 0
Views: 1534

PostForum: KEF Speakers from the 1970s   Posted: Sat May 26, 2012 10:56 am   Subject: Hi-Fi News offer
This will annoy anyone like myself who got the KEF 50 years book at full price.
It's a UK only offer of 12months subscription and the KEF book for 41.50
Had to let you all know.

http://www.hifin ...
  Topic: R105.1 crossover question
BobL

Replies: 5
Views: 2522

PostForum: KEF Speakers from the 1970s   Posted: Wed Apr 04, 2012 9:07 am   Subject: R105.1 crossover question

one 25W amplifier into one speaker will produce 6dB less s.p.l. than one 100W amplifier into the same speaker (10log

I have banged this around in my head for hours trying to grasp what you're tel ...
  Topic: R105.1 crossover question
BobL

Replies: 5
Views: 2522

PostForum: KEF Speakers from the 1970s   Posted: Tue Apr 03, 2012 10:30 am   Subject: R105.1 crossover question

Voltage dBs are 20log base 10 of the ratio. Hence 6dB and not 3dB.


Thanks speakerguru for taking the time to help me understand this.

I now have to ask the obvious and probably dumb questio ...
  Topic: R105.1 crossover question
BobL

Replies: 5
Views: 2522

PostForum: KEF Speakers from the 1970s   Posted: Sat Mar 31, 2012 5:37 pm   Subject: R105.1 crossover question
I know that when some kind person reveals the answer to this question I'm going to stunned that I couldn't see it without asking but here goes anyway..

Reading Keftopics about r105 crossovers it sa ...
  Topic: Softening the T27
BobL

Replies: 22
Views: 14108

PostForum: KEF Speakers from the 1970s   Posted: Tue Sep 20, 2011 5:10 pm   Subject: Re: "It is very noticeable that the R101s are more aggr


Bob- the material is Foam Weather tape from MD Building Products of Oklahoma City Oklahoma. It is 1/2 x 3/4 inch with self adhesive. I also tried a brand by Duck. I could tell no difference in ...
  Topic: Softening the T27
BobL

Replies: 22
Views: 14108

PostForum: KEF Speakers from the 1970s   Posted: Tue Sep 13, 2011 5:08 pm   Subject: Re: "It is very noticeable that the R101s are more aggr

Bob,
I'll check it out and make another post.

Thanks for that. You've really got me intrigued with this.

Bob.
  Topic: Softening the T27
BobL

Replies: 22
Views: 14108

PostForum: KEF Speakers from the 1970s   Posted: Sun Sep 11, 2011 12:36 pm   Subject: Re: "It is very noticeable that the R101s are more aggr

This afternoon I remembered that I had some foam weather stripping out in the garage. I checked to see if it would work as a substitute for the foam inside the grills, which came OEM on the KEF. T ...
  Topic: Going patially active with R105 MK1
BobL

Replies: 4
Views: 2566

PostForum: KEF Speakers from the 1970s   Posted: Thu Aug 18, 2011 7:58 pm   Subject: Going patially active with R105 MK1
Hi guys,

Sorry I've not been back since asking my questions but there has been DNS issues with this web site and two ISPs (Plusnet & Virgin) were unable to resolve it for over a week.

So, If ...
  Topic: Going patially active with R105 MK1
BobL

Replies: 4
Views: 2566

PostForum: KEF Speakers from the 1970s   Posted: Sun Aug 07, 2011 4:03 pm   Subject: Going patially active with R105 MK1
It has been many years sinse I last had a crack at an active 105 using the diagram KEF supplied, I was never too impressed with the results and abandoned the project.

Active xover at <www.mighty ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Thu Dec 02, 2010 7:02 pm   Subject: Active crossover question
They are the same, the sensitivity is set by the chosen bass extension point in the chosen enclosure for this type of bextrene driver, the passive crossover cannot boost bass above that efficiency, it ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Thu Dec 02, 2010 3:10 pm   Subject: Active crossover question
Not to compensate rolling off in the bass, but to compensate a rising response over the increased frequency range.
We obviously see things differently but to me those two things are the same.
Effic ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Thu Dec 02, 2010 8:53 am   Subject: Active crossover question
"with 125Hz splitting frequency with a bump at 250Hz"

Meaning a crossover frequency at 125Hz but an increase in volume around 250Hz to perhaps compensate and end-up with a flat response. ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Wed Dec 01, 2010 10:12 am   Subject: Active crossover question
My hazy memory is that an enthusiast wrote in with the circuit to Mr. C and he passed it on to the lab. The frequency response curves have an EE number, so that tells me that it was built up by in the ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Mon Nov 29, 2010 10:08 am   Subject: Active crossover question
If you care to look up the Keftopics you will find you were wrong all along about the 150Hz passive in the Mk2.

I can see it's important to you so yes, I did incorrectly remember the xover on the p ...
  Topic: Active crossover question
BobL

Replies: 33
Views: 24362

PostForum: DIY with KEF drive units   Posted: Sat Nov 27, 2010 4:37 pm   Subject: Active crossover question


exactly, and that is precisely why the active is 5dB higher at 200Hz compared to 2kHz compared to the passive 400Hz design, it's needed for both in the active and is not there for both in the pass ...
 
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