Thank u all for the reply...
OK here is where i am at right now..
I have got metal sheets to fix the contact mics.. the size of the sand pile=
is about 10ft x 10
ft and i have got circular arrays of about 200 contact mics...the idea is t=
o increase the
audio level as the viewer walks closer to the subwoofer.. so each array is =
connected to a
mixer...
My question is what would be the best glue to fix the contact mics to the m=
etal sheet??
aslo do u think i should keep the metal sheet lifted off the floor to get m=
aximum
vibration.. for some reason this gallery has carpeted floor so i am thinkin=
g it might absorb
the vibration..
anyways i will keep this updated as i go along..
again.. i do appreciate the feedback,,
thanks
--- In "Aaron Ximm" <> wrot=
e:
>
> On 9/30/06, faza.rm <> wrote:
> >
> > I am doin this installation for a gallery. There will be a subwoofer in=
the
> > middle of the gallery
> > and a pile of sand around it.. the viewers are required to walk on the
> > sand..
> > I am trying to buy contact mics and burry them in the sand so that the
> > sounds of their
> > footstep will be picked up and transmitted to the speaker...
> > However the contact mics that i got does not seem to be as senstive as=
i
> > thought it would
> > be.. i am just fixing them onto the floor..
>
>
> This a great question for the phonography and perhaps lowercase-sound
> mailing lists, where more people do this kind of work...
>
> I would first try bonding the mics to a large thin sheet of metal and put
> the sand over that. A tight coupling will let the sheet act as one large
> sensative receptor. You still may find you need a lot of gain however.
>
> Australian sound artist Joel Stern told me recently about an altoids-tin =
box
> he got as a direct-in (DI) box for using piezoelectric contact mics, he
> called it a preamp but I was wondering if was doing impedance matching si=
nce
> it changed the frequency response of his piezos. He got it from someone
> online for around US$25, but I don't remember what they're called, alas.
>
> best,
> aaron
>
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