[Top] [All Lists]

Re: modified ambient recording setup AT 3032

Subject: Re: modified ambient recording setup AT 3032
From: "Steve Cox" naturalsoundscapes
Date: Sat Dec 1, 2007 4:21 pm ((PST))
I am interested in hearing what other experiences are out there in regards =
to getting close
to a matched pair of the 3032's. Interesting thing about these mics, there =
doesn't appear
to be an serial number on them. I was hoping that AT would offer matched pa=
irs but I
don't know how they would keep track of them.

I followed Scott's suggestions and recorded a small bit of pink noise with =
the mics almost
touching, inverted the right channel and saved the mono file. It's in the "=
Files" area and
called T32-diff.wav. If it was a dry day I would have tried Rob's method as=
 well. I also do
not have 3 or 4 good headphones. I'm lucky to have one.

I recorded with my 722 @ 24/96. There seems to be a fair amount of differen=
ce between
them but other than noticing the glaring small band at 16K I really don't k=
now how to
evaluate these two as a pair. I am now going to test my matched pair of NT1=
-A's using the
same method with the same gain.

I know there are people on this list that know far more about this stuff th=
an I do. Thanks,
in advance, for any and all help/advice.

Steve Cox

--- In  Scott Fraser <> wr=
> <<1) how would i go about testing each mic to make sure they match? i =

> was planning on pumping out some white noise and recording each one
> from the same perspective. then maybe checking it on a graphic eq
> program in protools? is there anything else i can do to test their
> response?>>
> Pink noise is better & more appropriate for this sort of broadband
> frequency response testing, since it contains equal energy per
> octave. Mount the mics as physically close together as possible, &
> record the pink noise. Play back the stereo file in mono with the
> polarity inverted on one channel only. Perfectly matched mics should
> perfectly cancel, except for the very highest frequencies, where the
> slightly offset physical location means a slight phase offset.
> Everything you hear which isn't cancelled is the frequency response
> difference between the two mics.
> Scott Fraser

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU