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Music servers and other computer based digital audio technologies.

RE: Null Test Differences (NTD) are problematic




Just to give you an example, for this optimized NTD a series of double acquisitions were made in the analog domain with signals at:

1) -90db
2) -95db
3) -100db
4) -110db
5) -115db
6) -120db
7) optional...in the digital domain (the bottom one).

Each one has received a small modification in the spectrum, precisely at 1000Hz and 10.000Hz.
Even at this low level NTD perfectly shows the modified segment at 1000Hz and 10.000Hz. From the picture we can evaluate difference at least up to -117db...in Analog.




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