I have to post this screen shot of the program Spectre. It is the best audio analysis program I have ever seen. It lets me see the signal levels, in three different monitors, and the audio spectrum.
I have always been convinced that for good HiFi reproduction you have to have an audio bandwidth larger than the usual 20-20kHz that everyone quotes - based on that's what you can hear, so that's all you need.
To reproduce the actual sound of many instruments you have to have a much wider bandwidth. Here you can see the signals way above 20kHz.
Spectre is running on my MacBook which is a great computer for audio and sound production, or reproduction.
Have a look at these two recordings, on the left the BBC studio "Live" show from iTunes AAC download, on the right a 24bit/96kHz studio HD recording from Linn Audio, see the harmonic content above 20kHz! on the right recording. This is another reason why CD and iTunes AAC is an obsolete technology and needs to be upgraded....
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