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Author Topic: Disabling the high pass filter on u67/m269  (Read 1445 times)


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  • Real Full Name: Mike Zietsman
Disabling the high pass filter on u67/m269
« on: August 10, 2019, 05:00:25 AM »

Good Day,

I'm embarrassed to admit that I do not know how to disable the inbuilt HPF in my stock u67/m269 mics.
I have searched for several manuals and while they all make a mention of it, none offer practical steps needed to safely disable the HPF. There are references to "opening s2". In my past experience, a user adjustable feature like this would involved moving a jumper, but from what I can tell this involves either some snipping or de-soldering... and I would HATE to do it incorrectly...

What are the proper, practical steps to disabling the inbuilt HPF on these microphones?

As always,
Thank you!


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  • Real Full Name: John Raham
Re: Disabling the high pass filter on u67/m269
« Reply #1 on: August 10, 2019, 12:29:56 PM »

Maybe Klaus can refine the details, but here’s how I do it in u67’s:
Take a pair of snips and snip the “top left corner” of the s2 jumper.  Bend the newly snipped horizontal piece of the jumper wire up away from the board and affix it to the back of the tube socket with a tiny drop of glue. (So the snipped piece of wire is not loose in there and won’t make contact with anything conductive.)
Then if you want to put it back to stock, you can just bend the jumper back into place and solder the corner that you snipped...


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Re: Disabling the high pass filter on u67/m269
« Reply #2 on: August 10, 2019, 07:45:27 PM »

Perfect explanation. Nothing to add.
Klaus Heyne
German Masterworks®
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