# MS20 LPF Problem?

**URL:** <https://lookmumnocomputer.discourse.group/t/ms20-lpf-problem/3143>\
**Category:** DIY STUFF\
**Created:** [March 12, 2021, 12:02pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-lpf-problem/3143 "2021-03-12T12:02:37Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\
**Post date:** [March 12, 2021, 12:32pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-lpf-problem/3143/5 "2021-03-12T12:32:21Z")

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This post links to an article that explains when and why this happens:

> [@LMNC MS20 Filter Low Output](https://lookmumnocomputer.discourse.group/t/lmnc-ms20-filter-low-output/660/43):
>
> Ah, phase reversal, our old friend… Is it only when you crank up the resonance, or does it happen also at low resonance levels? What signal source are you using?

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