# Weighting for wow and flutter

**URL:** <https://forum.quantasylum.com/t/weighting-for-wow-and-flutter/1536>\
**Category:** QA40x\
**Created:** [August 23, 2024, 6:37pm UTC](https://forum.quantasylum.com/t/weighting-for-wow-and-flutter/1536 "2024-08-23T18:37:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tomatillo](https://avatars.discourse-cdn.com/v4/letter/t/e79b87/32.png) [@tomatillo](https://forum.quantasylum.com/u/tomatillo)\
**Post date:** [August 23, 2024, 6:37pm UTC](https://forum.quantasylum.com/t/weighting-for-wow-and-flutter/1536/1 "2024-08-23T18:37:48Z")

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Im new to using the Qa403 for testing amps. I saw it has a visualizer for wow and flutter. I was wondering how to set it up for NAB, JIS, CCIR, or DIN weighting? It would be cool if there could someday be a checkbox to select which weighting standard, if that is the right terminology.  
The Qa403 is really a cool unit!

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**Author:** ![restorer-john](https://avatars.discourse-cdn.com/v4/letter/r/b5a626/32.png) [@restorer-john](https://forum.quantasylum.com/u/restorer-john)\
**Post date:** [August 25, 2024, 8:56am UTC](https://forum.quantasylum.com/t/weighting-for-wow-and-flutter/1536/2 "2024-08-25T08:56:46Z")

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I believe the current output is unweighted.

I haven’t compared the QA403 W&F visualizer to my standalone W&F meter. It has all the weightings, and separates wow and flutter, peak and RMS.

 ![image](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/b/b8ada55f3147230c4b8e361ea2b63b2358d3df88.png)

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**Author:** ![Tube709](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.quantasylum.com/tube709/32/3224_2.png) [@Tube709](https://forum.quantasylum.com/u/Tube709)\
**Post date:** [February 4, 2026, 7:19pm UTC](https://forum.quantasylum.com/t/weighting-for-wow-and-flutter/1536/3 "2026-02-04T19:19:22Z")

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Any new update regarding the Wow & Flutter tool?

I remember having read here a thread about a possible update of the tools…

I use it a lot when I create calibration reports for my cassettes and Reel-to-reel decks. Unfortunately, I am unable to find the corresponding values the tool report versus the multitude specifications of manufacturers.

I know that the tool give unweighted values, but witch one between:

- peak (DIN/IEC/ANSI unweighted)
- RMS (JIS/IEC/NAB weighted)

??