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Multi-Way Conventional loudspeakers with crossovers

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Old 1st March 2013, 08:31 AM   #1
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Question Where can I find schematics for speaker crossovers?

In a thread about a B&W DM4 problem, system7 has included a graph showing resistance and a schematic for the crossover. I wondered where these details could be found in relation to other speakers, specifically the B&W DM2 and the Kef DN12 - any suggestions (T27, B110, B139)?
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Old 1st March 2013, 05:56 PM   #2
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Google is your friend...

http://www.hifiloudspeakers.info/Ana...Crossover.html
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Old 1st March 2013, 06:10 PM   #3
system7 is offline system7  United Kingdom
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Those of us who have dug around for speaker details with the Google search engine know where to find stuff.

KEF stuff can be found here:
Technical Details of KEF Crossovers

You have KEF Concertos, DN12 SP1004 crossover updated by Falcon Acoustics who are pretty good. You might also find new crossover components at Wilmslow Audio:
KEF Concerto B139B B110A T27A network DN12 SP1004
Concerto Upgrade Crossovers

See those old Non-polar electrolytic capacitors dry out with age and degrade.

I presume you aren't terribly interested in B&W designs, but I dug up some stuff at The Art of Sound Forum - Powered by vBulletin. You have to join to see the scans in "The Knowledge." B&W themselves publish good documentation too.

The below KEF Concerto stuff should look familiar. Hope it helps.

Edit: You are on it, Don! LOL
Attached Images
File Type: jpg KEF_Concerto_DN12_SP1004.JPG (52.4 KB, 165 views)
File Type: jpg KEF_Concerto_DN12_Crossover.JPG (69.9 KB, 164 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 1st March 2013, 06:12 PM   #4
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All B&W speaker service manuals are available from B&W.com. I'll dig out the link and post it when I find it.

That took about 20 seconds on Google.

http://www.bwgroupsupport.com/manuals/bw-service

Moderators, I do wish you could make this link sticky as it is asked so many times and the information is freely available.

Last edited by KatieandDad; 1st March 2013 at 06:18 PM.
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Old 1st March 2013, 06:44 PM   #5
system7 is offline system7  United Kingdom
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Hate to say this KatieandDad, but old B&W stuff is a pig to find.

B&W Group North America Service & Support - Owner's Manuals & Drawings

No use at all for the DM2 details. We rely on ENTHUSIASTS here to dig inside.

Click the image to open in full size.

This is the well liked B&W DM-2A, but it must be different from the older DM2.
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 1st March 2013, 06:58 PM   #6
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Quote:
Originally Posted by KatieandDad View Post
All B&W speaker service manuals are available from B&W.com. <snip>
Thanks for that. Sadly the information for the DM2 is pretty sketchy. There is an impedance graph (which looks pretty "all over the place" to my untutored eyes) but it isn't great quality and it isn't really possible to read it. Thanks anyhow.

Some time ago I did try contacting B&W with an enquiry about replacing the sound dampening material inside the DM2s (there are three different varieties) but they said that there was nobody there any longer who knew anything about them.


Thanks for the Kef stuff system7 & Don. I am aware of the Falcon Acoustics crossovers and they do look good, particularly the 5aB.


Anyhow, thanks to all for the various replies - I will try to make better use of Google in future Click the image to open in full size.
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Old 1st March 2013, 07:35 PM   #7
system7 is offline system7  United Kingdom
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If I have an old cabinet with old and worn-out drivers, I usually measure the bass cutout and volume and wonder if I can fit modern drivers.

Maybe something like the Troels Gravesen Classic three way could be done in a biggish box:
3-Way Classic

I suspect the SEAS CA18RNX might be too small, but George Krilov has some nice designs:
DIY loudspeaker "OPTIMA" - YouTube

See, diyaudio has only your imagination as it's limit!
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File Type: jpg George_Krilov_Optima_Tower.JPG (55.9 KB, 30 views)
File Type: jpg George_Krilov_Optima-SE_Bookshelf.JPG (73.2 KB, 32 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 1st March 2013, 07:37 PM   #8
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The DM2 is on that site, just go down a bit to the older stuff.

I've found both the DM2A and the DM2/II.

Last edited by KatieandDad; 1st March 2013 at 07:40 PM.
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Old 1st March 2013, 07:41 PM   #9
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Quote:
Originally Posted by KatieandDad View Post
Moderators, I do wish you could make this link sticky as it is asked so many times and the information is freely available.
K&D,

I have sent this to the backroom for consensus. In the future please hit the report post button when you wish to communicate with us. We don't just magically see every post.
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Old 1st March 2013, 07:44 PM   #10
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Cheers Carl. I just find it frustrating when the same questions get asked over and over again.
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