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RE: You can

"upsample yourslef to move brick wall filter as far away from 22k as posiible. Increasing bit depth also enhances performance of modern dacs significantly."

Brick wall is on recording. There is no way to remove it, as the information is already gone. By using tailored filters and upsampling one can reduce ringing but this will come at the expensive of rolling off high frequencies. Preringing (if it's on the recording) can be eliminated by going to a linear phase filter but only if there is huge attenuation at the ringing frequency, i.e. more high frequency roll off.

Increasing the bit depth without resampling will do nothing, it does not and can not add any information, just adds a bunch of zeros to the end (32 bit integer) or a byte of exponent information (32 bit floating point). If one resamples, the filter operation does add extra bits but these don't represent any new information, just extra bits that need to be handled one way or other, or else the conversion will have lost information.

It should be clear that taking a 44/16 recording and processing it does not differ whether this is done in the computer or in the DAC. In both cases the same information is available. If doing this in the computer sounds better it is because (a) the audiophile has chosen a better algorithm than the DAC or (b) the processing done in the DAC in real time is somehow degrading playback. In both cases, the conclusion is that any differences can be attributed to faults in the DAC. There is no possible magic that will produce better sound than is in the original 44/16 file. If it were really possible to eliminate the problems with 44/16 audio by upsampling then there wouldn't be all the grousing about "fake hires" downloads on some sites.


Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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