# Multiband EQ - Grey line on the back?

**URL:** <https://qa.fmod.com/t/multiband-eq-grey-line-on-the-back/16585>\
**Category:** FMOD Studio\
**Created:** [December 22, 2020, 4:38pm UTC](https://qa.fmod.com/t/multiband-eq-grey-line-on-the-back/16585 "2020-12-22T16:38:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tarpin](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@Tarpin](https://qa.fmod.com/u/Tarpin)\
**Post date:** [December 22, 2020, 4:38pm UTC](https://qa.fmod.com/t/multiband-eq-grey-line-on-the-back/16585/1 "2020-12-22T16:38:13Z")

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Hi !

Hope you’re all good.

I have a question about the multi band EQ. What’s the purpose of the grey line in the back of the red line ? It’s looks like kind of an opposite curve ; but not always.

Some help for lightning my brain ?

Thanks for the help,

Respects,

Martin,

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**Author:** ![mathew](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/mathew/32/431_2.png) [@mathew](https://qa.fmod.com/u/mathew)\
**Post date:** [January 4, 2021, 10:09pm UTC](https://qa.fmod.com/t/multiband-eq-grey-line-on-the-back/16585/2 "2021-01-04T22:09:34Z")

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The grey background line represents phase response of the filter.