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There is no point measuring F.R from the recording of a 'supposedly-flat' instrument doing scales e.g. piano, because it is anything but flat.
No, we must use an instrument mathematically pure and measurable, ideally sine waves, poduced not from a signal generator's output, but mathematically generated and produced by a computer, so that there is no air, or
acoustics/mechanical stuff to upset the levels or purity of the notes.
I have created a CD with several tracks of equal amplitude sine waves , and also frequency sweep 20-20khz, which would be a good tool to demostrate the
problem clearly and simply of most peoples hi-fis i.e. they are not full-range reference systems at all.
25hz
35hz
100hz
200hz
300hz
500hz
1khz
5khz
10khz
15khz
20khz
mix of 25hz+20khz
mix of 1khz+15khz
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