All of these "relative" recordings have little to no value in terms of
"how loud" the noise may be. Yes, it is there. Amplify it enough and
it will blow the side of the house out. The phone on top of the amp is
certainly not where ones ear may reside.
If one wishes to cite how loud a sound exists, then use a sound level
meter and measure the noise at a specific and stated distance and
several different axis and report the level in dB. A weighted or C
weighted. Also measure and state the level of the room ambient. Use
a spectrum analyzer to quantify the nature or content of the sound,
frequency and waveform. Those numbers will then equate to something
that is meaningful. If others do the same, then there is contained
evidence of units which may contribute to the artifact of concern.
73
Bob, K4TAX
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