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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: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Tue Feb 18, 2014 2:22 pm   Subject: Simulating the Kef Kube filters
Having trouble sending a PM, keep getting the error:

Failed sending email :: PHP ::

DEBUG MODE

Line : 234
File : emailer.php

Is your app available to download anywhere?
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Tue Feb 18, 2014 2:21 pm   Subject: Simulating the Kef Kube filters
speakerguru: Are you referring to the 104ab? I'm planning on using this with my 104/2's.

The values for the friend circuit are the same as the ones from the KEF Kube 200 schematic. Perhaps my simul ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Fri Feb 14, 2014 11:55 pm   Subject: Simulating the Kef Kube filters
I've been visually matching the simulation data with a Linkwitz calculator. So far the values look like:

f0 = 57
Q0 = 1.1
fp = 26
Qp = 0.42

These values look seem possible to me. This is lo ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Mon Feb 10, 2014 12:00 am   Subject: Simulating the Kef Kube filters
I've finally managed to simulate the BEC stage. Check it out at: http://www.partsim.com/simulator/#15762
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Sun Feb 09, 2014 11:18 pm   Subject: Simulating the Kef Kube filters
Sorry for the delay.

Would it be possible to get a copy of the software that extracts the transfer function from the friend circuit? I've been trying to do it this evening based on the equations fr ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Mon Feb 03, 2014 11:42 pm   Subject: Simulating the Kef Kube filters
I'd be interested in a couple of PCB's for the Kube and could help get some quotes together if that would make things easier.

That software sounds very interesting. I've been looking through the sc ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Mon Feb 03, 2014 1:22 pm   Subject: Simulating the Kef Kube filters
The Kef Kube 200 ideally.
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Sun Feb 02, 2014 11:06 pm   Subject: Simulating the Kef Kube filters
It would be incredible if you could share the transfer function in S and I'll attempt to convert that (it may involve dusting off some old engineering books).

Long term it would be great to build s ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Sun Feb 02, 2014 12:53 pm   Subject: Simulating the Kef Kube filters
Wow, I didn't think I'd get to talk to the chap who designed it!

I think this DSP can simulate a second order biquad: http://www.minidsp.com/applications/advanced-tools/advanced-biquad-programming ...
  Topic: Simulating the Kef Kube filters
theozaurus

Replies: 20
Views: 13520

PostForum: KEF speakers   Posted: Thu Jan 30, 2014 10:55 pm   Subject: Simulating the Kef Kube filters
I've just received one of these: www.minidsp.com/products/minidsp-in-a-box/minidsp-2x4

It can be used for room correction which is quite interesting: http://www.minidsp.com/applications/acoustic-me ...
  Topic: KEF 104/2 B200 woofer sticking
theozaurus

Replies: 16
Views: 9427

PostForum: KEF speakers   Posted: Thu Jan 30, 2014 10:47 pm   Subject: KEF 104/2 B200 woofer sticking
Hello again!

I've finally got the 4th subwoofer repaired. They managed to change just the voice coil so the cone is still original and the foam has been replaced. Played them last night and VERY pl ...
  Topic: WTD: B200 SP1256 or KR 1465 for KEF Reference 104/2
theozaurus

Replies: 0
Views: 2129

PostForum: KEF speakers   Posted: Mon Nov 25, 2013 2:29 pm   Subject: WTD: B200 SP1256 or KR 1465 for KEF Reference 104/2
Hello,

I'm in the process of restoring a pair of biwire KEF 104/2 reference speakers.

One of the woofers has blown, so I'm after a replacement. Does anyone have a B200 SP1256 or similar (I think ...
  Topic: KEF 104/2 B200 woofer sticking
theozaurus

Replies: 16
Views: 9427

PostForum: KEF speakers   Posted: Sun Nov 24, 2013 8:34 pm   Subject: KEF 104/2 B200 woofer sticking
Well I've got 3 of the 4 subwoofers refoamed. The complete speaker sounds absolutely brilliant now - what a difference.

Refoaming it wasn't too tricky and using the shims ensured there were no alig ...
  Topic: KEF 104/2 B200 woofer sticking
theozaurus

Replies: 16
Views: 9427

PostForum: KEF speakers   Posted: Thu Nov 14, 2013 11:51 pm   Subject: KEF 104/2 B200 woofer sticking
Sorry for the delayed reply, work has got in the way of the important business of restoration.

It sounds like we definitely need to have a chat. I notice you've also drawn up a PCB for a Kube. I'm ...
  Topic: KEF 104/2 B200 woofer sticking
theozaurus

Replies: 16
Views: 9427

PostForum: KEF speakers   Posted: Mon Nov 04, 2013 11:35 pm   Subject: KEF 104/2 B200 woofer sticking
Ideally the transfer functions for the KEF 200 which would allow biamping.

The price they are going for at the moment on place like eBay seem very high. I've seen the schematics you've uploaded fo ...
 
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