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100+ Head-Fier
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Are those measurements from the Metrum or the ULN-2?
I think it's from Metrum.
Wow, roll off as early as 6KHz ...
So I would imagine upsampling though software would negate this problem?
As Miska already suggested, the only way of getting rid of the innate Fs/2 ringing in a 44.1kHz signal would be to suppress it by filtering with a shallower filter (i.e. less ringy, but still ringy) starting much earlier in the audio band (e.g. at 18kHz) and reaching significant attenuation well before 22kHz.
you are mistaking upsampling for oversampling Redbull, how could you upsample 44.1 x 8 (352.x kHz) and then send to the metrum when its inputs are limited to 96khz? apparently 192 works with some gear, but last I read the inputs were only rated at 96.
Oops, my bad, never consider the max allowed input of Metrum.
Yes I still confuse between upsampling and oversampling. What's the difference?
So then the best possible upsampling is 2x?
nos has other issues like the rolloff and also out of band noise depending on the design, treating your ears as the low pass filter.
Yes I still confuse between upsampling and oversampling. What's the difference?
So then the best possible upsampling is 2x?
Up-sampling has a target frequency. Oversampling is simply a multiple. They are essentially the same thing.
Something I might have to try is switching my Ref 7.1 to NOS mode and seeing if it can produce a square wave like the Octave.
If you have 44.1 files than no problem with 4x upsampling as Metrum works well with 176.4 and works iwth 192 for some (for me it works with AP2).