Kef R105/3 Kube equaliser schematic - Page 2 - diyAudio
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Old 8th September 2005, 10:30 AM   #11
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AndrewJ, is the Kube 200 the same as for my 104/2's?
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Old 8th September 2005, 02:20 PM   #12
Mark Kravchenko --- www.kravchenko-audio.com
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Default THis will get you drooling a bit.

Not a great deal of info but it's a beginning.

http://www.hifiloudspeakers.info/pub...4aac1bcaa5#929

http://hifiloudspeakers.info/public_...8b8e582536970c

The latter one gives you a corner point and the Q of the filter used.


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Old 8th September 2005, 04:53 PM   #13
jez is offline jez  United Kingdom
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Thanks for that tip Mark!, I have joined that site, looks interesting.
Jez.
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Old 8th September 2005, 05:02 PM   #14
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Andrew,
Thanks a lot for your help. In fact, what is the difference between using an active subwoofer and the Kube as I also get a KEF 20B subwoofer in additon to the 105/3. I hope this is not a silly question.
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Old 21st September 2005, 11:47 PM   #15
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Hi hkvictorhui,

I'm back from CEDIA and have just found my Kube 200.

The pin configuration and transformer requirements for the AC input is:
Transformer: two secondaries, each 23Vac no load or 46Vac center tapped
power supply plug: 5pin DIN 270deg. Center pin is common
Pins closest to center pin on each side is unused
Pins outermost are the AC voltage.

So, each winding is connected between one outer pin and the center pin.

Is this clear the way I have explained it??

Jez,

Are you still in need of the cct diagram?


regards

Andrew
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Old 21st September 2005, 11:50 PM   #16
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Quote:
Originally posted by AndrewJ
Are you still in need of the cct diagram?
Hey Andrew, I'd still like it if it's not too much hassle.
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Old 22nd September 2005, 09:27 AM   #17
jez is offline jez  United Kingdom
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Hi Andrew,
Yes I am still in need of a cct diagram, Kef obviously either don't have it or (more likely) can't be bothered to look for it. I think reverse engineering one is the only way now.....
Regards,
Jez.
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Old 22nd September 2005, 04:28 PM   #18
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Dear Andrew,
Thanks a lot for your help. I think I can understand the pins assignment but what is the rating of the supply please?

Besides, could you please also advise the connection diagram of the Kube 200 to the speakers or do you have the idea of where can I find the user manual?

Regards,
Victor
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Old 23rd September 2005, 04:06 PM   #19
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Question More technical information on the Kube 200 supply please

Andrew,
There are more technical questions in constructing the supply:
1) Can the transformer be 24v-0-24v as there is no 23v-0-23v transformer readily available in the shop?
2) What fuse rating should I use for the protection?
3) Repeated from my previous posting, what VA should the transformer be?

Thanks
Victor
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Old 25th September 2005, 09:31 PM   #20
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hkvictorhui,

Yes the power supply can be 24-0-24v. It is regulated down to +/-18v in the regulators.
The VA rating of the supply shouldn't be crtical, anything of around 5-10VA should be fine.
As for fusing, we never fused the originals, but you could perhaps try something in the range of 200mA fuses as a precaution, but just be careful about the inrush current and use slow blow fuses.

The Kube is connetced in the tape monitor loop of the pre-amp, or between the pre-amp and power amp. Input and output are on RCA connectors.

I am working on the cct diagram, squinting my eyes and trying to dredge the memory banks to remember the topology I used. My eyesight isn't what it used to be when I first designed it!!

Regads

Andrew
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