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In Reply to: How low is too low posted by morricab on June 15, 2006 at 08:18:12:
The noise level at the eardrum is circa 6 dB SPL white noise in the range of 20 to 20000 Hz.Something 5.5 dB below that (remember, you have to consider the noise level in each critical bandwidth, the reported noise level above is for the whole frequency range of 20 to 20k!) is pretty likely to be very inaudible.
Even with ear canal resonance, -10dB SPL is the lowest level that people have reported for non-pathological absolute thresholds. Something below that is gone.
So, even taking that extreme, something with a range of -10dB to 110 dB is probalby more than enough for electronically reproduced music using most any usual loudspeaker. That's 120 dB SPL.
Something with a flat error spectrum can reduce that by 16dB, to the atmospheric-noise case, give or take.
In the presense of signal, the highest sensitivity to perturbations inside an ERB (modern version of a critical band) is about 30dB. However, across critical bands, especially when looking downward in frequency, 90dB is not a bad number to consider.
I realize this isn't a direct answer, but in fact that's some numbers that can be well supported in present-day understanding.
You do notice that they do not assure that most equipment is transparent.
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Follow Ups
- Some basic numbers... - real_jj 11:12:06 06/15/06 (2)
- Re: Some basic numbers... - morricab 13:18:48 06/15/06 (1)
- It's not "some critical bands", rather - real_jj 13:47:12 06/15/06 (0)
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