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Old 1st March 2015, 03:32 PM   #1
diyAudio Member
Join Date: Feb 2011
Default Martin Logan CLS Mk 1 Electronics Upgrade?


After lurking around this site for some time now it is time for my first post.

I have a pair of Martin Logan CLS Mk 1 with brand new ML panels but looking at the Electronics box attached to the panels have made me wonder if you could upgrade, improve or replace it? After all it is almost 30 years old.

The ML's are used in a system with active XO and room correction so maybe I could start by bypassing the filter in the interface box? Have anyone tried that?

Thanks in advance
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Old 1st March 2015, 08:05 PM   #2
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myhrrhleine's Avatar
Join Date: Jan 2006
Location: Avalon Island
Without a schematic it is hard to guess.
i would start with replacing the power supply capacitors.
Be sure to get the same capacitance and voltage.
Just because you can't hear it doesn't mean no one can.
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Old 2nd March 2015, 07:09 PM   #3
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Join Date: Feb 2011

Of cause you are right about the schematic.
I found a threat over at Martin Logan Owners mentioning tweaking the CLS Mk 1.

CLS I Tweaks

Here I also found the following attached schematics.

Hope it helps.
Attached Images
File Type: jpg Martin Logan CLS Mk 1 Schematic.jpg (70.6 KB, 30 views)

Last edited by Jasgaard; 2nd March 2015 at 07:22 PM. Reason: Forgot Picture
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Old 3rd March 2015, 11:41 PM   #4
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Andersonix's Avatar
Join Date: Jan 2004
Location: Silicon Valley, California
Post a photo of your supply.
Replace old electrolytic caps.
And replace the cheap film caps with your personal favorite film caps, and report back.
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