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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: Tangent TM1 revival
audiolabtower

Replies: 2
Views: 2793

PostForum: Other speakers   Posted: Thu May 25, 2017 5:21 pm   Subject: Tangent TM1 revival
Personally I think that square reflex tube was purely a gimmick. It must lead to "chuffing" and non linear behaviour under high output - just read the research done recently on port design e ...
  Topic: Reference 101 S Stop circuitry fault
audiolabtower

Replies: 11
Views: 589

PostForum: KEF speakers   Posted: Mon May 08, 2017 3:33 pm   Subject: Reference 101 S Stop circuitry fault
I'm not sure if SpeakerGuru actually designed these speakers, so he should know Smile but from memory it has 2 large inductors and 1 small inductor in the crossover which are wound on iron dust cores, ...
  Topic: Reference 101 S Stop circuitry fault
audiolabtower

Replies: 11
Views: 589

PostForum: KEF speakers   Posted: Thu May 04, 2017 12:39 pm   Subject: Reference 101 S Stop circuitry fault
Unfortunately the Falcon B110 is a SP1003 replacement, not the SP1057 which was used in the 101. The 1057 had twice as much power handling and a smoother response. In the event of no spares the only r ...
  Topic: 105.1 tweeter mounting hardware
audiolabtower

Replies: 8
Views: 535

PostForum: KEF Speakers from the 1970s   Posted: Fri Apr 28, 2017 11:24 am   Subject: 105.1 tweeter mounting hardware
From memory the edges were rougher than MDF which is usually quite smooth and solid? Maybe they were still flooring grade chipboard so used the grip nuts? Or an early rougher type of MDF? The B300 baf ...
  Topic: Kef 105.2 Crossover / Head Assembly wiring HELP!
audiolabtower

Replies: 25
Views: 1707

PostForum: KEF speakers   Posted: Thu Apr 20, 2017 10:47 am   Subject: Kef 105.2 Crossover / Head Assembly wiring HELP!
Yes the switch is on the pcb, so it sits behind the power select knob.
  Topic: KEFKIT1 SP1045 kit
audiolabtower

Replies: 2
Views: 374

PostForum: DIY with KEF drive units   Posted: Tue Apr 18, 2017 12:13 pm   Subject: KEFKIT1 SP1045 kit
Wow, a regency Chorale! I understand Chippendale was the first to used bextrene cones when perfecting his rococo carvings and elaborate fretwork Very Happy
  Topic: Just picked up pair of 105.2's Have S-Stop ?
audiolabtower

Replies: 9
Views: 521

PostForum: KEF Speakers from the 1970s   Posted: Mon Apr 17, 2017 9:44 pm   Subject: Just picked up pair of 105.2's Have S-Stop ?
The LED's do not come on at all except when doing the initial setup.
They should blink on at the 50 and 60 peak positions if you play loud?
  Topic: Just picked up pair of 105.2's Have S-Stop ?
audiolabtower

Replies: 9
Views: 521

PostForum: KEF Speakers from the 1970s   Posted: Sun Apr 16, 2017 10:31 pm   Subject: Just picked up pair of 105.2's Have S-Stop ?
I've seen reviews where 1000W peak have been tolerated on wide dynamic range material for short periods of time so the speakers are by no means limited to 200W, there are too many variables in heating ...
  Topic: Rubber surround is sliding
audiolabtower

Replies: 4
Views: 317

PostForum: KEF speakers   Posted: Sat Apr 15, 2017 12:03 pm   Subject: Rubber surround is sliding
Upload your pics to a free site, eg picassa, open them there in a window with its own web address, then use the img button in the message box here to copy the link into your text. Pic will then appear ...
  Topic: Kef 105.2 Crossover / Head Assembly wiring HELP!
audiolabtower

Replies: 25
Views: 1707

PostForum: KEF speakers   Posted: Fri Mar 03, 2017 1:10 pm   Subject: Kef 105.2 Crossover / Head Assembly wiring HELP!
Colin is no longer with us.

I don't have a Mk2 to look at so can just surmise from your track pictures.

Looking at the pcb tracks the blue wire input goes to the blue wire output and tweeter pos ...
  Topic: Kef 105.2 Crossover / Head Assembly wiring HELP!
audiolabtower

Replies: 25
Views: 1707

PostForum: KEF speakers   Posted: Fri Mar 03, 2017 12:19 pm   Subject: Kef 105.2 Crossover / Head Assembly wiring HELP!
In my Mk1s blue is definitely tweeter driver positive, green is mid driver positive, and naturally red/black went to the woofer terminals as Guru explains.

The tweeter and mid driver negatives were ...
  Topic: Actively driving a KEF R107
audiolabtower

Replies: 8
Views: 856

PostForum: KEF speakers   Posted: Thu Feb 16, 2017 1:11 pm   Subject: Actively driving a KEF R107
By the way, here is an example of the Kube shaping from Mk1
http://www.stereophile.com/content/kef-r107-loudspeaker-1987-measurements#rGwm0Ajm3vlQjdpc.97
as you can see without the Kube the high cro ...
  Topic: Actively driving a KEF R107
audiolabtower

Replies: 8
Views: 856

PostForum: KEF speakers   Posted: Thu Feb 16, 2017 12:58 pm   Subject: Actively driving a KEF R107
two 100uF in parallel running the signal to the mid/high plug with a 6,4mH inductor across. So there's a second order high pass filter in the main crossover tuned to 140Hz where there's more space fo ...
  Topic: Actively driving a KEF R107
audiolabtower

Replies: 8
Views: 856

PostForum: KEF speakers   Posted: Tue Feb 14, 2017 9:20 pm   Subject: Actively driving a KEF R107
I think it depended on the exact series. Some Kubes equalised the 107 bass only, so could be left out of mid and treble sections if tri-amped, but others did the shaping through the mid and higher to ...
  Topic: Help & or suggestions on inherited kk3!
audiolabtower

Replies: 10
Views: 1221

PostForum: DIY with KEF drive units   Posted: Thu Jan 19, 2017 1:00 pm   Subject: Help & or suggestions on inherited kk3!
Good post. Cool
 
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