Hi,
I realise this is probably not the kind of request you get everyday and 
would like to say thanks in advance for any advise you folks might be 
able to offer.

Im a multimedia artist working here in ireland. I have an installation 
which will be part of a music festival here in september.

http://www.electricpicnic.ie/flash.html

For the installation i have proposed to capture the sound of 10000 or 
so people all jumnping in unison to the music and play it out through 
small speakers situated at the far end of the festival from the main 
stages. i also anticipate picking up some of the music as it is 
transmitted into the ground via the mainstage (if he had ears) would 
hear under the festival.

I was thinking a geophone would be the right device to capture the 
sound with. Im most interested in the 20 to 1200Hz range of 
frequencies.

I have no experience with this type of equipment and was hoping you 
might be able to advise me on a suitable device for this project? Also 
what type of amplification would i need to bring the output signal up 
to a line level, (around 100mV).

Any advise such as whether a geophone would be sensitive across this 
frequency range, where i might get one, how much they cost etc that 
could be offered would be really great.

Many thanks

Nicholas

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