# Tractor and maximum FFT size

**URL:** <https://forum.quantasylum.com/t/tractor-and-maximum-fft-size/1197>\
**Category:** Uncategorized\
**Created:** [January 19, 2024, 9:22pm UTC](https://forum.quantasylum.com/t/tractor-and-maximum-fft-size/1197 "2024-01-19T21:22:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![HawkerAMpT](https://avatars.discourse-cdn.com/v4/letter/h/ac8455/32.png) [@HawkerAMpT](https://forum.quantasylum.com/u/HawkerAMpT)\
**Post date:** [January 19, 2024, 9:22pm UTC](https://forum.quantasylum.com/t/tractor-and-maximum-fft-size/1197/1 "2024-01-19T21:22:03Z")

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I’m using tractor with a QA401,  
I have some high distortion plots that for some reason give lots of ripple and ringing when doing frequency response with the standard 32K FFT size. If I jump up to 128K FFT the problem mostly goes away.  
I can make this work in the QA401 app and make a mask no problem.

However it appears that tractor does not support a FFT size above 64K. Is this correct? Why can I not put 128K FFT into tractor without getting an error?