My DSP monitor works at 96 khz.
I have to decide between poly sinc hb and asrc or sometimes closed form interpolation. ( only 2 up)
the roll off and the attenuation can be as extreme as possible, but the area up to Nyqvist should remain untouched
If HQPlayer’s “Apod” counter stays 0 or below 10 at all times for length of track, you can theoretically use halfband filters. By definition, halfband filter will always leak some amount of images. You could also use something like like poly-sinc-gauss-xl.
As I responded in the other thread, poly-sinc-gauss-long is probably the most neutral one from multiple points of view, and it will also deal with source content errors indicated by the Apod counter. Those errors are naturally not neutral by any means, so they should be corrected for neutral output.
Thank you very much! The description of poly sinc hb confused me a bit, because I had concluded that non-halfband filters would change the original data 
Yes they do, but preserving original data containing errors doesn’t have much value. So it is better to correct the errors from the source data while doing the work.
Please also note that in any case when you convert between rate families, like from 44.1k to 96k, all the samples need to be recalculated anyway, no way of preserving the original ones. This is what your speakers will do inside if you feed those with for example 44.1k or 88.2k source data. And I’m pretty confident that the HQPlayer algorithms I suggested do better job on this…
I have no doubt about that, I am completely convinced, even if a DSP monitor can probably only deliver part of its performance…
I am curious about what makes the poly-sinc-gauss-long more neutral than poly-sinc-gauss?
Thanks
And what would be the most neutral SDM modulator? I always felt the 7EC super sound a touch warmer…
It is not hugely different, any of the poly-sinc-gauss* things can be considered neutral. But I consider poly-sinc-gauss-long the most general purpose balance between different properties working well for wide variety of music genres. So I just picked it as the single choice, that’s also why it’s default 1x filter. Just need to choose one.
It is sort of counterpart of poly-sinc-ext2 which could be considered also very neutral and balanced choice, I could maybe put it on second position on the list if I’d need to choose another single one.
Well, they all are… I’m still undecided which one I prefer more, light or super. At the moment I’m pretty much using those 50/50 depending on the particular server/DAC combination I’m using. Same goes for output rates, I’m happy with both DSD256 and DSD512 and use both.
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