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In Reply to: RE: I said hearing in SPL posted by fmak on September 12, 2014 at 09:51:45
If you get a tube amp to produce 130dBspl through your speakers you will not hear anything at -120dBspl because the distortion noise is 1000 to 10 000 times stronger.
Alternatively you could stand next to an air hammer and the chances are that you won't be able to hear the ticking of a watch you might be wearing.
While we can perceive noises or signals from a few dBspl to about 120+dBspl we can not perceive them if they are happening simultaneously. For simultaneous aural stimulation we can hear differences of about 40-50dB. Anything more than that and the lower one will be completely masked.
Similarly and using a Mahler crescendo of 120dB or more you won't be able to tell if the triangle is being played or not.
Follow Ups:
since of course if humans can only hear about -50dB into a song or signal that is playing then all the claims of hearing unmeasurable differences between power cables and USB cables fly out the window.
This explains why the Audio Diffmaker is such a bogeyman here. Inmates are afraid to even try it as it might upset their view of audio on two points: one, their ears aren't as superhuman as inmates think they are and two, the dratted machine can detect audio information the inmate could not.
Here's a thought experiment. How loud can a healthy NFL quarterback shout? I'm guessing after a lifetime of calling signals as a class they've got pretty strong voices. However, there are NFL stadiums that routinely have crowd noise measured at 130db when the visiting team is on offense. In those situations it's next to impossible for the quarterback to make himself heard by his teammates so clubs go to the so called "silent count" where visual signals are used instead. Pro football clubs certainly have no problem believing in audio masking.
JE
is just argument for the sake of it - no response.
'-120dBspl because the distortion noise is 1000 to 10 000 times stronger'
1. Where did you get those numbers? The same place where creators of MP3 codec got theirs, along with masking they love to talk about? Why did it fail so miserably then in their case, even at the highest bit rates, to sound exactly as CD, with its measly 96 dB of dynamic range?
2. Are you able to hear a difference between power cords, interconnects, USB cables, media players on PC, ASIO vs. KS vs. WASAPI etc.? If not, I respectfully suggest doing something about it, like ASAP. But, if yes - what would be your guess, how far down below (in dB) the measured differences would lie?
Klippel test of added distortion. Easily heard through my system down to 0.5%THD (-46dB).
Which is why I would not ever employ a valve amp of any kind, I want my electronics to be at least one order of magnitude below my speakers when it comes to adding distortions of any kind.
I do not use mp3s since they sound horrible. I don't even use lossless codecs.
I also do not use USB except to connect my keyboard and mouse to the computer.
USB is a deeply flawed and inelegant way to stream anything.
And while I fairly easily hear differences in amps or convertors I have never heard any between standard, decent interconnects or speaker cables and more expensive ones.
I have no idea about ASIO, KS or WASAPI since none of that stuff exists on my computer.
However I do remember ASIO from a couple of decades ago and it was shit and lacking in elegance in design, very much like USB.
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