Refurbing Martin Logan CLS panels - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 10th March 2008, 03:25 PM   #1
diyAudio Member
 
Join Date: Nov 2007
Default Refurbing Martin Logan CLS panels

Hi

Some think I am insane but I am attemting to refurb a set of Martin Logan CLS panels.

CLS Panel Repair - Breaking New Ground

I am being discouraged by everone I communicate with regarding DIY repair to ML panels. I got nothing to lose so I thought why not give it a try...

I carefully sliced through the 'front' double-sided tape that adheres the front stator to the panel assembly.

Spars have been sprayed from the front with Q20 as to loosen the adhesive.

Carefully the front stator have been pulled off - great care has been taken not to rip the mylar or bend the stator.

Click the image to open in full size.
Naked Panel - dusty!

Click the image to open in full size.
HT copper strip - nasty!

Click the image to open in full size.
HT copper strip - oxidized

Click the image to open in full size.
Spar - nothing but firm weather stripping

To be continued...
  Reply With Quote
Old 13th March 2008, 09:24 PM   #2
diyAudio Member
 
Join Date: Nov 2007
Click the image to open in full size.

This morning I carefully restored the electronics boxes to factory standard with some help of schematics supplied by Martin Logans' helpful service manager Jim Power. Thanx Jim! He was also kind to have shown me that the electronics were heavily modified...

Click the image to open in full size.

Box here attached to oak frame holding esl panel.

Click the image to open in full size.

GD
  Reply With Quote
Old 14th March 2008, 02:36 PM   #3
Few is offline Few  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Maine, USA
Thanks for posting the photos. It's useful to see some construction details of commercial ESLs.
Few
  Reply With Quote
Old 14th March 2008, 04:37 PM   #4
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally posted by Few
Thanks for posting the photos. It's useful to see some construction details of commercial ESLs.
Few
A pleasure...

Using double-sided tape makes DIY stat panels easy as pie to make... dont you think?

GD
  Reply With Quote
Old 15th March 2008, 02:39 PM   #5
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

the answer is NO!

jauu
Calvin
  Reply With Quote
Old 15th March 2008, 05:38 PM   #6
Few is offline Few  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Maine, USA
Compared to the hours (days...weeks...months...) I've spent trying to come up with a convenient way to make stretched wire stators, I'd have to say it's pretty straightforward to make a perforated steel panel that will sound good. On the other hand, coming up with refined stator coatings, building with tight tolerances to maximize performance, and developing all the other tricks that separate first efforts from more refined projects certainly are more demanding tasks. I still find it pretty amazing, though, how simple a perforated metal stator design can be if you just want to get something up and making very clear sounding music.

Few
  Reply With Quote
Old 15th March 2008, 10:21 PM   #7
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally posted by Calvin
Hi,

the answer is NO!

jauu
Calvin
My my but you are optimistic!!



GD
  Reply With Quote
Old 15th March 2008, 10:27 PM   #8
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally posted by Few
Compared to the hours (days...weeks...months...) I've spent trying to come up with a convenient way to make stretched wire stators, I'd have to say it's pretty straightforward to make a perforated steel panel that will sound good. On the other hand, coming up with refined stator coatings, building with tight tolerances to maximize performance, and developing all the other tricks that separate first efforts from more refined projects certainly are more demanding tasks. I still find it pretty amazing, though, how simple a perforated metal stator design can be if you just want to get something up and making very clear sounding music.

Few
Few - Perf Sheet Stators seems the most logic way to go. They say that Nylon 66 powder coating it the best coating for perf sheet stators.

Double-sided tape is a no-brainer...

Easy guys!!
GD
  Reply With Quote
Old 16th March 2008, 11:39 AM   #9
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

regarding Nylon 66....
the answer is again NO!
Its rather a cheap to fabricate solution which works acceptable.

If it were the best, You might ask why donīt corona resistent magnet wires come with it?
If it were the best, You might ask why ML search for alternatives!
Just because ML uses this material successfully as coating of their stators, it is not necessarily the best or the only material to use. It just proves that this is one of the easiest and cheapest ways to achieve certain goals.

Itīd be desirable for example to have a material with higher flashover treshold to reduce coating thickness. Itīd be desirable to have a considerably higher dielectric constant to raise efficiency. It would be desirable to have a material which can be processed easier and cheaper, maybe even DIYable.

jauu
Calvin

btw. of course am I optimistic Iīve learned so many things about electrostats in 25 years that I know, that Iīd never regard them as easy.......but that they only appear easy on first glance.
  Reply With Quote
Old 21st March 2008, 05:48 PM   #10
diyAudio Member
 
stokessd's Avatar
 
Join Date: Nov 2002
Location: Grantham, NH
Calvin is saying:

The devil is always in the details, no matter what you are doing.


Sheldon
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Martin Logan SL-2 Panels....help! CanAm Man Planars & Exotics 10 15th February 2008 11:20 AM
FS - Martin Logan CLS Panels nautilus Swap Meet 3 19th December 2007 12:35 AM
For Sale: MArtin Logan Ascent Panels efgee Swap Meet 1 21st February 2006 07:23 AM
martin logan csl flodge Planars & Exotics 12 13th November 2005 03:59 PM


New To Site? Need Help?

All times are GMT. The time now is 02:48 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2