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In Reply to: RE: -75 dB posted by Tony Lauck on June 24, 2014 at 21:07:56
Try to speak clearly and simply, are you suggesting people should not hear difference in this particular comparison?
Never trust an Atom, they Make Up everything!
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What a -75 dB null means is the difference between the two was 1 part in about 30,000,000.
If one were to change the level of the signal you were listening to by that amount, it would be a change of about 1.4^-8 dB, or "pretty small".
If you're working up to say something then by all means spit it out.
Never trust an Atom, they Make Up everything!
Hi
I am not sure what you mean but I can explain without using dB which is a log scale and can be confusing.
As the dB scale is commonly used, maybe explain that would be better.
dB in this use refers to the difference between two things, a 3dB difference is a factor of two in power, 6dB is 4 times, 12dB is 16 times, 20dB is 100 times, 60dB is a million times.
So, if the distortion in an amplifier were -40dB down from the real signal, the THD would be about 1/10,000 the power or level of the desired signal or 1/100 the Voltage level.
-75 dB here means the difference between the two is about 1/30,000,000 the power of the desired signal.
Is that much change audible?
Now this is more complicated because ears are not microphones, what we experience as “audible reality” is FAR more than just the sound pressure reaching ones ears and includes what we see and know as well.
It is the lifetime of hearing that has allowed us to learn to use all the weird things our ears do as a function of angle and height, to create the 3d mental image we experience as reality.
That stuff is usually disconcerting to audiophiles as we know nothing else but that experience and yet it is also well known to audiologists that our ears aren’t “flat” in their frequency response at all and have all kinds of complications.
Hope that helps
I reported what I heard and what I measured. It is not my place to say what other people "should" or "should not" be able to do.
I doubt there would be agreement on what it means for someone to "hear" these differences. (It is necessary to agree on the size of the pin before debating how many angels will fit on it.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
If you ever grow a pair let me know, I might then try asking again.
Lol
Never trust an Atom, they Make Up everything!
I am not an easy troll, so I won't take your bait.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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