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195.86.126.19

***If you do a histogram analysis it will likely show no samples at -50dB. Does this mean the 1kHz signal is not there? no, if you play it you will clearly hear it. in contrast, i doubt you can hear the 48kHz signal recorded at a much higher volume.***

This isn't accurate.
There should be samples visible in any case. Every audio signal and even noise is crossing zero so statistically there have to be low level samples included in the count.

(That there are none could be a fault in the software creating the histogram.)

"again, LP's "noise" - primarily surface noise in a good set up - is primarily below 1kHz. The dynamic range above 1kHz is very high - at least on par with CD. the surface noise is an artefact our ears can easily filter out, allowing us to hear most of the low level detail that is there."

The dynamic range of LP isn't anything near that of 16 bit pcm.
There is no cutting head in the world that is able to handle high frequency at full scale output. In fact high frequencies are filtered at 16kHz and there is a slight boost around 12kHz to sort out cutting head anomalies.


Noise levels from sacd's I sampled turned out to be fairly high.
Only with filtering you get lower noise levels. ( and improved accuraccy! ) But it's a trade of against bandwidth.

There are already 'natural' filters in the listening chain, our speakers and ultimately our ears.

The audiosoftware's tools like the equalizer can show very low noise levels for steady state test signals just by averaging across hundreds or thousents of perdiods of the steady stade signal.

However this doesn't mimic the behaviour of our hearing.
The hf noise is naturally filtered out because it's too fast for our inner ear to be able to even detect it.


By using a bessel filter set to mimic this natural behaviour of our hearing brings the result you get from the statistical tools in your audio software more in line with what humans hear.

Frank

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