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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: I think GedLee did his best work in Rush posted by 13th Duke of Wymbourne on June 20, 2024 at 12:02:45:
Indeed! Rush rules!
Cheever added an SPL factor into his model because there is also a change in the ear's own generated harmonics. It also then would depend on the sensitivity of the speaker and how much distortion/power at a given SPL...
So, a high sensitivity speaker that only needs mW to a couple of watts will be an easy, low harmonic dominated (which are basically masked) distortion pattern that will sound clean.
Once you get beyond a certain SPL it will really depend on how rapidly the devices distortion, particularly the high order harmonic distorion rises and how that still compares to the ear/brain masking...complicated but can go a long way to explaining a lot of the subjective varaiabilty observed.
"But, the big unanswered question is whether a low distortion system is somehow worse? We don't know because they don't detail the transfer functions! "
It is not low distortion per se, it is the fact that there are high order harmonics without lower order harmonics to provide masking. The audibility seems to be down to very low levels. Achieving this with negative feedback has it's issues with regard to artificial noise floor (read Crowhurst and Pass white paper) and IMD that gets generated. Just seeing absent harmonics in a static test does at all tell the whole story.
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- RE: I think GedLee did his best work in Rush - morricab 05:45:55 06/21/24 (0)
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