[REQ] Realistic "Ping" (not movie ping)

[Letum]

I have been reading up a bit about ASDIC.

It seams that almost all ADSIC was between 16khz and 24khz. Almost never lower
than 4Khz.

Now, thats very, very high frequency. Humans can't hear above 20khz, most people
can't hear much above 16khz. (you can (or can't!) hear a sample at 16khz HERE)

This means that the "ping" sound you hear in the game is bunkum!
It's just not like that at all unless you have equipment to lower the frequency.


That does not mean that you can not hear the high-pitched ping at all in a sub, but
what ever it sounds like, it wont be a "Ping".


Does anyone have any clue what ASDIC would sound like from inside a sub if
it could be heard at all?
I would guess that the ping would cause some lower frequency sounds as well.

Would anyone like to have a go at making a truly realistic ping?



So far the only lead I have is from Steve who says he read the sound was
like:"gravel being thrown against the hull".