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In Reply to: RE: The ups and downs of arbitrary sample rate conversion posted by fmak on June 26, 2008 at 11:19:50
Thank you.
Have you tried the various filter settings on your DAC when playing back the test files? They might make a difference. The original DXD file from 2L has the characteristic noise spectrum of sigma-delta modulation. When I tried some null tests down converting from DXD to 96000 and back to DXD using r8brain I got a very poor null (25 db) until I filtered out all the noise above 30 Khz from the original waveform. Then I was able to get about an 80 db null, indicating sonic effects that may be audible but are very subtle.
It is entirely possible that people are hearing differences that are not related to the music but are related to artifacts of the digital processing used in the record-playback chain. They may not be on the recording at all, or even in the DAC output, but may be introduced by a power amplifier, etc.
If you were to try the more agressive filtering in your DAC and see if the sonic differences are still present, this would be interesting.
Tony Lauck
"Perception, inference and authority are the valid sources of knowledge" - P.R. Sarkar
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