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Re: contact mic

Subject: Re: contact mic
From: "faza.rm" faza.rm
Date: Sat Oct 14, 2006 12:37 am (PDT)
Hello all..

I have one quick question about the contact mics...
I was trying to use metal sheets to fix the mics on to get the best sound 
possible.. now to 
cover such a large area with sheet metal was too expensive for me.. i was 
wondering if 
there is another material that would be ideal for contact mics.. i gather wood 
would absorb 
the sound vibrations too much.. 
any suggestion would be much appreciated...

thanks


--- In  "faza.rm" <> wrote:
>
> 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 to 
> 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 
> metal sheet?? 
> aslo do u think i should keep the metal sheet lifted off the floor to get 
> maximum 
> vibration.. for some reason this gallery has carpeted floor so i am thinking 
> 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" <aaron.ximm@> wrote:
> >
> > On 9/30/06, faza.rm <faza@> wrote:
> > >
> > > I am doin this installation for a gallery. There will be a subwoofer inthe
> > > 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 since
> > 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
> > 
> > -- 
> >   aaron.ximm@
> >   quietamerican.org
> >   oneminutevacation.org
> > 
> >   83% happy
> >    9% disgusted
> >    6% fearful
> >    2% angry
> > 
> > 
> >
>







"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg

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