Hi Garth!
 You make some excellent points about loudness. The highest I've ever
subjected myself to intentionally was 130dB of pink noise for room
tuning. That was to stress test a finished sound system to make sure it
wasn't going to fall apart at more reasonable and usable frequencies (it
was a  1300 seat church locally).
Now that is damned loud, unreasonably loud, uselessly loud.
-> GR> system that could produce inaccess of 125db of sound, (sound???
->
-> SD> 125db really isn't that much in car audio competition.  There's
-> SD> some  vehicles  here in the US that can hit 155db and higher.
OK, I'm impressed, if you want me to be. So now I can hear your car
coming from 6 city blocks away rather than 3. As you probably already
know, auto stereo is covered elsewhere, where such items of fact will
get comments of praise rather than wrath like here. (Not you Garth),
that's intended to the original poster. As you put it..
-> 155db Ooh! I couldn't tolerate that level, especially in a car, I
-> think I'd rather stuff my head up the exhaust of a Boeing jet. |-}
I've done near to that before myself when I was younger and more stupid.
Checking drivers in a big system by sticking my ear up to the cabinet in
full operation trying to find that buzz of a bad speaker to kill a
cabinet during a concert. Every time you halve the distance to the
speaker you you double the apparant volume meaning that an audience
level of 115dB in the acid rock era would easily be that 130 or highter
at the speaker.
I've noticed government people with SPL meters and a number of concerts
locally, one for an outdoor venue that had been operating for years
before a housing development sprung up almost next door to it, and now
the people in the houses are bitching about the volume, so the venue
will probably have to end up moving because of it from it's current Cal
Expo spot.
Now if an audience level of 115dB is still about say 100dB at the
houses, image how bad 155 dB would be going down your street.
-> According to some expert or another on the same TV program, made a
-> point of the fact that internal organ damage could occur at the close
-> proximities. Personally I feel there may be some merit to this.
-> Didn't the Germans play around with low frequency horns during WW2,
-> apparently a frequency of around 7Hz has pretty nasty effects on the
-> body. Is this the bodies resonant frequency, maybe? If this were the
-> case then surely harmonics of this could be injurious?
A device known as an "acoustical laser" was invented by them and could
have been a major factor if used in against a large group of men on a
battlefield. Basically it is two very high powered ultrasonic drivers
operated so that it would hetrodyne a beat frequency in a subsonic range
that would cause internal hemmoraging in the body because of the
internal parts rubbing against each other due to the vibration.
I used 14Hz to great effectiveness during a production of Dracula we did
in college. Before Dracula would appear I would put some 14Hz through
the sound system, which no one heard yet it gave them a queeziness in
the stomach like when you get afraid, so when Dracula popped in they
were already half way there. Very effective. We had some other great
staging and lighting effects that made him seem like he came out of
nowhere, and flew in a bat (a puppet) on a wire that went right through
where the curtains met when closed. Most of the audience didn't even
realize it was there, so from the back of the house, here comes this bat
screech, and it flys overhead the audience, behind a stage prop couch in
the set, the lights flicker for a second, a flashpot goes off and up
pops Dracula.
Bonnie *:>
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