In article , Iain Churches
wrote:

"David" wrote in message
...
"David Looser" wrote in message
You are correct on all counts. The only acoustic instrument capable
of creating these sorts of levels at sub-audible frequencies is the
pipe organ.

Oranges are not the only fruit.

The orchestral 60" bass-drum (Turkish or Italian Gran cassa) and
contrabass sarusaphone are also close contenders (not as oranges, but as
producers of sounds that are "less like notes and more like
sensations":-)

But how much of that is a component at around 10Hz that reaches a level
anything like 120dB (A?)?

The Bosendorfer Grand Imperial concert piano is also pretty impressive
in its ability to make the earth (and even the orange) move with C(0) at
16.45 Hz.

I can appreciate that it has a key for that. However I do wonder about both
the above question and the possibility that what is heard is actually a
perception from the harmonics. IIRC it is well established in the physio
and psycho acoustics that humans will 'hear' the fundamental of a series of
harmonics at LF even if the actual fundamental is absent.

Thus I do remain uncertain of the need to actually reproduce something like
10Hz at 120dB level for mere music in a domestic situation. I can see it
may be useful for disaster movies, though. 8-]

Slainte,

Jim

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