Kef reference 104/2 circuit diagram

dublin78 · 17th March 2006, 01:33 PM

Please can anyone help me get hold of a circuit diagram for mt kef Reference 104/2 with cap and inductor sizes.
Thanks in advance.
Michael

clem_o · 18th March 2006, 12:36 PM

Hi Michael,

You can check out Martin Collom's book "High Performance Loudspeakers". I'm not sure which edition is current, but the 5th edition has the circuit on page 267. It's in the chapter on "systems and crossovers", given special mention on "full impedance compensation".

I never did check the schematic for accuracy against my pair.

Hope this somehow helps...

Cheers

lufbramatt · 18th March 2006, 02:08 PM

Quote:

Originally posted by clem_o
Hi Michael,

You can check out Martin Collom's book "High Performance Loudspeakers". I'm not sure which edition is current, but the 5th edition has the circuit on page 267. It's in the chapter on "systems and crossovers", given special mention on "full impedance compensation".

I never did check the schematic for accuracy against my pair.

Hope this somehow helps...

Cheers

I just happened to have got that book out of the library last week to help with my dissertation . . .

attached is the figure from page 267- took me a while to find a power cable for my scanner, but hey, im trying to put off working as long as possible

dublin78 · 18th March 2006, 02:15 PM

Thank you.
That is quite an expensive book, but it looks like a good read.
I will wait to see if anyone has a diagram that they could send me rather than fork out £50 for an unconfirmed source.
Michael

dublin78 · 18th March 2006, 03:52 PM

Thanks Matt, and Clem_O also - and the power of the internet.

clem_o · 21st March 2006, 05:26 AM

Quote:

Originally posted by lufbramatt

I just happened to have got that book out of the library last week to help with my dissertation . . .

Sounds like an interesting dissertation!! :-)

dublin78, hope the info is enough for you. Expect some variations in component values as KEF would compensate for production differences etc.

Cheers!

ps: you may find additional info at

http://www.hifiloudspeakers.info

but its mostly focused on the older KEFs. Go to the site's forums, click on "KEF speakers"

dublin78 · 21st March 2006, 09:42 AM

Hello again
The scematic that was printed in the Colloms book was nothing like my crossovers. Ignoring the cap and inductor values, there are more components in mine than were on the attached circuit diagram. Thanks for your help though.
I am trying to contact kef service, and the www.hifiloudspeakers.info site looks excellent.
Does any one know how to remove the crossovers from the main chassis. It looks like a nightmare.

clem_o · 21st March 2006, 10:39 AM

Hi dublin78,

Now you have me curious... can you take a pic of what you have? In my 104/2, the crossover board is mounted on the bottom panel (where the feet are screwed in). Its easy enough to remove, all wiring's spade-contact so as not to require any desoldering...

Re more parts than the schematic - come to think of it, the crossover I have seems to have a fair number of parts... I am really not sure if it matches or not. As I said, I could take the thing apart and trace it out... should have done that a long time ago anyway.

Cheers!

Clem

ps: my experience with kef - they don't seem to have technical information on the older loudspeakers, though they are happy enough to sell spare drivers etc if they have it...

Jonathan Bright · 21st March 2006, 10:25 PM

Can you tell us why you want the diagram? I have a copy of a review which has the circuit but no values. I'll dig it out an see if it (the layout) matches Collums book.

Jonathan Bright · 22nd March 2006, 02:42 AM

I have just found the review I mentioned in the last post. The various "L" "C" and "R's" are indentical and it also suggests a possible explanation for the greater parts count that the earlier posts mention. The diagram in the review has an additional box called an "S-Stop" circuit. The text doesn't seem to address its function but as it only crosses the mid and hi frequency drivers it is probably a protection circuit of some kind. That would certainly account for the additional components mentioned.

17th March 2006, 01:33 PM	#1
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Kef reference 104/2 circuit diagram Please can anyone help me get hold of a circuit diagram for mt kef Reference 104/2 with cap and inductor sizes. Thanks in advance. Michael

21st March 2006, 10:25 PM	#9
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Can you tell us why you want the diagram? I have a copy of a review which has the circuit but no values. I'll dig it out an see if it (the layout) matches Collums book. __________________ "It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.

22nd March 2006, 02:42 AM	#10
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	I have just found the review I mentioned in the last post. The various "L" "C" and "R's" are indentical and it also suggests a possible explanation for the greater parts count that the earlier posts mention. The diagram in the review has an additional box called an "S-Stop" circuit. The text doesn't seem to address its function but as it only crosses the mid and hi frequency drivers it is probably a protection circuit of some kind. That would certainly account for the additional components mentioned. __________________ "It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Circuit diagram for Trilogy VTi.	harwoodspark	Tubes / Valves	0	1st August 2007 06:36 PM
Circuit Diagram	epacor	Parts	1	3rd February 2007 06:42 AM
Help! circuit diagram	vodaTube	Tubes / Valves	0	8th July 2005 06:49 AM
ML 383 circuit diagram	leigong	Solid State	0	29th June 2004 02:13 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

18th March 2006, 12:36 PM	#2
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Hi Michael, You can check out Martin Collom's book "High Performance Loudspeakers". I'm not sure which edition is current, but the 5th edition has the circuit on page 267. It's in the chapter on "systems and crossovers", given special mention on "full impedance compensation". I never did check the schematic for accuracy against my pair. Hope this somehow helps... Cheers

18th March 2006, 02:15 PM	#4
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Thank you. That is quite an expensive book, but it looks like a good read. I will wait to see if anyone has a diagram that they could send me rather than fork out £50 for an unconfirmed source. Michael

18th March 2006, 03:52 PM	#5
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Thanks Matt, and Clem_O also - and the power of the internet.

21st March 2006, 09:42 AM	#7
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Hello again The scematic that was printed in the Colloms book was nothing like my crossovers. Ignoring the cap and inductor values, there are more components in mine than were on the attached circuit diagram. Thanks for your help though. I am trying to contact kef service, and the www.hifiloudspeakers.info site looks excellent. Does any one know how to remove the crossovers from the main chassis. It looks like a nightmare.

21st March 2006, 10:39 AM	#8
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Hi dublin78, Now you have me curious... can you take a pic of what you have? In my 104/2, the crossover board is mounted on the bottom panel (where the feet are screwed in). Its easy enough to remove, all wiring's spade-contact so as not to require any desoldering... Re more parts than the schematic - come to think of it, the crossover I have seems to have a fair number of parts... I am really not sure if it matches or not. As I said, I could take the thing apart and trace it out... should have done that a long time ago anyway. Cheers! Clem ps: my experience with kef - they don't seem to have technical information on the older loudspeakers, though they are happy enough to sell spare drivers etc if they have it...

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read