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In Reply to: RE: Spectrum Plot for CD rip and 24/96 download - pics posted by AbeCollins on July 11, 2014 at 20:02:29:
" Of course that blip gets filtered by the DAC and is beyond hearing range even before any filters."
The 28 kHz spike had better not be filtered by that DAC. The DAC is running at a 96 kHz sampling rate and should be reproducing information up to about 48 kHz. There might be a slight roll-off at 28 kHz, but it shouldn't be much.
Unless your analog amplification (including that in the DAC) has zero intermodulation distortion the 28 kHz is going to beat with harmonics of the audio and produce combination tones that may be audible. This would account for "hearing" effects of a sine wave that might be otherwise inaudible. (There are similar non-linear effects in one's ear and even in the air. The amount of intermodulation depends on the SPLs involved.). Variations in equipment, listening levels and listeners' hearing can account for different effects from this spurious tone.
It's quite possible that different tracks might not have the same spurious tone, particularly if they were originally recorded on different dates. (The tone might have been an artifact of the original recording, or the mastering engineers might have used different processes to make dissimilar recordings sound similar and one of the processes might have generated the artifact.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Spectrum Plot for CD rip and 24/96 download - pics - Tony Lauck 07/12/1407:27:23 07/12/14 (2)
- RE: Spectrum Plot for CD rip and 24/96 download - pics - Ugly 10:08:55 07/12/14 (1)
- RE: Spectrum Plot for CD rip and 24/96 download - pics - Tony Lauck 14:50:28 07/12/14 (0)
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