I think what that equal loudness contour is really showing is that the harmonic interference needs to be 70dB lower than you would otherwise think to get the results you are expecting.
This corresponds to my experience. The music keeps getting clearer even as you reduce the harmonic interference down to -160dB.
On the other hand, in my experience, random noise is not such a big problem.
This corresponds to my experience. The music keeps getting clearer even as you reduce the harmonic interference down to -160dB.
On the other hand, in my experience, random noise is not such a big problem.
C'mon guys, I guess my ears are very sensitive to midrange peak. I can't stand listening to full range speakers including my lowther dx2 with set.
Yes, you are right it might be possible with the volume turned right up. The harmonics are only 50dB below the signal.
Well, that particular one is an open question and might depend on how noisy your sound card is. With a battery powered I/V, my card is quite clean as the spectrum I posted earlier shows so there may be a chance. In any case, this is a red herring.
You haven't answered my point about a 2 or 3kHz signal at -100dBFS easily completely masking a 10kHz signal at -60dBFS and the implications that has for the impact of low level harmonic interference on the clarity of the highs in the music.
I notice that a few people here have resorted to insults when they know they have lost the argument.
Cheers
I have an idea for a test that just needs a watch (don't know if it would work and I'm not doing it today 😀), but it would involve a set of files of test tones that you play having set your normal listening level first. The amplitude of the tone would rise from nothing up to say -40 db over say 3 minutes. You just note the time at which the tone becomes audible to you. Could be done for say 1kHz, 4kHz and 10kHz. Its not scientific or anything like that but might give some clues as to what you all hear.
Just an idea 🙂
Perhaps you misunderstood. I will explain the test I did again:
The 2kHz interference signal was -100dBFS and the 10kHz "music" signal was -60dBFS so the music was 40dB higher than the interference but the music was still completely inaudible - masked by the 2kHz interference.
The 2kHz interference signal was -100dBFS and the 10kHz "music" signal was -60dBFS so the music was 40dB higher than the interference but the music was still completely inaudible - masked by the 2kHz interference.
To get a feel for just what it means to have something 50 or 100db "below" try these.
Each music file is recorded at a different level, -20db (which I suggest you play first at your normal listening level) then -40db and -60db. These tracks are from a proper test CD so the levels are correct.
Each music file is recorded at a different level, -20db (which I suggest you play first at your normal listening level) then -40db and -60db. These tracks are from a proper test CD so the levels are correct.
I'm confused... again. I assume all these levels are referred to the digital FS level. Without knowing the playback level, how does it mean anything? If I crank the gain way up on that -110 dB tone, sure I can hear it- buried in with all the other junk from my motherboard audio. At any sane listening level it's completely inaudible.
edit- Mooly got in first!
edit- Mooly got in first!
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