darrenyeats wrote: 
> With down-sampling, there is nothing to do in terms of level adjustment.
> With up-sampling, you might need level adjustment. But it seems Sox
> doesn't do -automatic- level adjustment, hence the difference for
> up-sampling and down-sampling.
No, with downsampling there is enough clipping going on also with peaks
that can reach above 1dB often enough. I use SoX myself and while
testing how to downsample best i found that SoX does less clipping as
other resamplers, especially when used with not so steep settings.
I never liked the idea of upsampling so i don“t know much about its
behaviour.


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