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Not at all Gary. I can hear from about 20hz to about 16khz. The point I was making, not terribly well I guess, is the possibility of stuff just outside the human audio band possibly impacting the human audio band (as supertweeters are often claimed to do). Also Alan's instruments were 'seeing' the full range up to 1ghz, not in or near the human audio band.
But I guess your recognised all this?
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Seems to me that if we are going to consider that frequencies beyond the limits of human hearing can be <ahem> 'perceived' (despite the lack of any evidence to support this) then I don't see how some arbitrary cut off at any point in the frequency range all the way up into gigahertz can be consistent with this theory.
BTW The reason we can hear supertweeters is because they have output within the accepted range of human hearing. No mystery there.
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Suertweeters that have clearly audible output are being misused. They should roll in above the output from the main tweeter, usually somewhere above 20kHz.
The exception is use with the Celestion HF1300 which output cuts off abruptly at around 13.5 kHz. A supertweeter used above these will have output audible to some, when employed with the correct 12/18 db/oct intro slope.
It is impossible for anything digital to sound analogue, because it isn't analogue!
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Sure, they should be properly integrated into the speaker design with a bespoke crossover - but I bet the vast majortity are simply used as add-ons plonked on top of the main speakers leaving them to squeak away and sound 'impressive' because of the accentuated upper treble.
.
"Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
Nikola Tesla
Its now a conspiracy theory to believe that the Immune system is capable of doing the job it was designed to do.
A fish is only as healthy as the water its swimming in ! [Dr Robert Young]
www.tubedistinctions.co.uk
Matthew 5:10
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Most tweeters seem to roll off at the top by around 12db to 18db/oct, so intro slope of the supertweeter needs to match this. Both need to be down a few db in output at the response overlap.
It is impossible for anything digital to sound analogue, because it isn't analogue!