Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

KEF LS50 - crossover?
KEF LS50 - crossover?
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
Reply
 
Thread Tools Search this Thread
Old 3rd July 2018, 11:52 AM   #1
Soldy is offline Soldy  Germany
diyAudio Member
 
Join Date: Aug 2017
Default KEF LS50 - crossover?

Hi,


does anyone know the schematics of the crossover of the KEF LS50?


Greetings,


Soldy
  Reply With Quote
Old 6th July 2018, 06:09 AM   #2
nimo_jon is offline nimo_jon  Singapore
diyAudio Member
 
Join Date: Feb 2010
Location: Singapore
There are examples:


Kef LS50 Crossover upgrade - DIY Audio Projects - StereoNET
  Reply With Quote
Old 6th July 2018, 06:36 AM   #3
Soldy is offline Soldy  Germany
diyAudio Member
 
Join Date: Aug 2017
Thank you, but thats just the crossover part for the low midrange woofer. I was hoping for the tweeter part of the crossover
  Reply With Quote
Old 6th July 2018, 08:01 AM   #4
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
It's always want, want, want here!

Oh well. I'll bite. Looks to me like the circuit on the left is the LS50 original. Suprisingly simple.

That's just a bass coil and a second order tweeter with a resistor for level.

Must be 3kHz crossover. Why do you want to know?
Attached Images
File Type: jpg KEF LS50 3.JPG (88.3 KB, 478 views)
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 6th July 2018, 08:10 AM   #5
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
KEF LS50 - crossover?
LS50 Schaltung Topo | ls50schaltungtopo | hifi-forum.de Bildergalerie
  Reply With Quote
Old 6th July 2018, 08:46 AM   #6
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
I did look at the links yesterday, but found it all very difficult in German.

KEF LS50 - crossover?-kef-ls50-3-jpg

But maybe some progress. The left section is a third order bass then.

That makes sense for a good speaker. The tweeter filter looks like a glorified second order in the image below. I can't guess the polarity with this coaxial.

And the section below that, called "Neu" might then be a new bass section.

Which still leaves me scratching my head on a new tweeter section.
Attached Images
File Type: jpg KEF LS50.JPG (47.5 KB, 450 views)
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 6th July 2018, 09:35 AM   #7
Soldy is offline Soldy  Germany
diyAudio Member
 
Join Date: Aug 2017
Thank you guys.

I am familiar with the German thread and even had contact with the guy who posted it. But unfortunately, he only knows the part of the crossover that is responsible for the mid woofer. And due to copyright, none of the images show the whole crossover.

@Steve: Neu means new -> it only shows his modified part of the woofer crossover


  Reply With Quote
Old 6th July 2018, 09:57 AM   #8
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
My German does extend to "Neu" as it goes.

How hard can this be, really? SEAS make the coaxial Loki with a 6" bass.

SEAS Loki MkIII

To make the bass third order, you would split the 2.2mH bass coil into about 1.8mH before and 0.4mH after the capacitor. You often put a little resistor across the 0.4mH. Which might be 5 ohms here. It ends up similar.

The Loki is a 3kHz cross to the tweeter.
Attached Images
File Type: png SEAS Loki Crossover.PNG (16.6 KB, 530 views)
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote
Old 6th July 2018, 12:56 PM   #9
Soldy is offline Soldy  Germany
diyAudio Member
 
Join Date: Aug 2017
Thx Steve, if no one has the schematics I will try this
  Reply With Quote
Old 6th July 2018, 02:18 PM   #10
system7 is offline system7  United Kingdom
diyAudio Member
 
system7's Avatar
 
Join Date: Aug 2008
Location: Portsmouth UK
My intuition, based on what I have seen here is something like below might work. 3kHz crossover for a 5" metal bass.

I really have no idea about polarity, but this can't be way off. The tweeter is effectively horn loaded, so the input 3.3uF capacitor is always smaller than you might expect.

I haven't attempted an 7-8kHz bass notch on the breakup.
Attached Images
File Type: png KEF LS50 Trial.PNG (6.4 KB, 373 views)
__________________
Best Regards from Steve in Portsmouth, UK.
  Reply With Quote

Reply


KEF LS50 - crossover?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
KEF LS50 jerryo Multi-Way 133 29th March 2018 10:22 PM
Pass labs amp for Kef LS50? stephenmarklay Pass Labs 8 26th January 2018 02:33 AM
KEF LS50 polars Hifisound Multi-Way 0 6th December 2015 07:43 AM
Amazing new KEF LS50 Remlab Multi-Way 3 3rd December 2012 10:51 PM


New To Site? Need Help?

All times are GMT. The time now is 09:10 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki