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Re: contact mic

Subject: Re: contact mic
From: "faza.rm" faza.rm
Date: Sun Oct 1, 2006 8:01 pm (PDT)
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
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=
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,,

--- In  "Aaron Ximm" <> wrot=
> On 9/30/06, faza.rm <> wrote:
> >
> > I am doin this installation for a gallery. There will be a subwoofer in=
> > 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=
> > 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 =
> 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=
> 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
> --
>   83% happy
>    9% disgusted
>    6% fearful
>    2% angry

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