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Re: MS stereo imaging problems with MKH30/50 combo - Sounds are swap

Subject: Re: MS stereo imaging problems with MKH30/50 combo - Sounds are swap
From: "Martyn Stewart" mijdog2000
Date: Tue Oct 16, 2012 10:07 am ((PDT))
Have you thought about a soundcloud account, Justin?

Martyn

Martyn Stewart
.........................................
www.naturesound.org
www.soundofcritters.com
.........................................
425-898-0462


Sent from my iPad

On Oct 16, 2012, at 12:26 AM, "ajustend" <> wrote:

> Martyn,
>
> I just tried uploading an mp3 of my recording (1.6 MB) but was unable to =
add it to the Files section of this message board. As I said, I am brand ne=
w here, can you point in my the right direction for where I can share my re=
cording so you can take a listen?
>
> Thanks,
>
> Justin
>
> --- In  Martyn Stewart <> wrote=
:
> >
> > Is there a chance you could post an example, Justin? I would like to ta=
ke a listen to your ordeal...
> >
> > Martyn......
> >
> >
> > On Oct 15, 2012, at 10:59 AM, "J. Mullens" <> wrote:
> >
> > > Hi, this is my first post to Nature Recordists.
> > >
> > > I have just added an MKH 30 to my collection in order to expand into =
MS
> > > recording and am experiencing very bad imaging (side swapping) with t=
he
> > > setup when the sound source is located in certain places behind the
> > > microphone.
> > >
> > > To clarify, I am *not *trying to record a surround signal using a ste=
reo
> > > mic setup, but I *am *interested in maintaining a correct left-right =
stereo
> > > image. When I use an XY setup, or an XY mic like a BP4025, anything o=
n the
> > > left side of the mic (in front of it or behind) will playback out of =
the
> > > left speaker. Using the MKH30/50 combo this is not the case.
> > >
> > > Here is the test I conducted: Set the microphones up in the middle of=
 an
> > > open field so that I can walk in a full circle around it. I start dir=
ectly
> > > in front of the M/S setup, about 15-20 feet away, and walk in a clock=
wise
> > > direction around mic calling out each position on the clock face. 12 =
is
> > > directly in front, 1, is to the right of that, 3 is directly to the r=
ight,
> > > 6 is directly behind, 9 is directly to the left side, etc.
> > >
> > > Here's the problem, when I get to the 4 & 5 o'clock postions (rear ri=
ght
> > > side) the sound source swap sides and sounds like it is coming from f=
ront
> > > left. And the exact opposite happens to the 7 & 8 o'clock positions
> > > sounding like they are coming from the front right.
> > >
> > > Again, any source originating in the 180 degree arc in front of the s=
etup
> > > performs beautifully and the stereo image is perfect. It only happens=
 to
> > > sounds coming from behind the mics, and if a sound source is making a
> > > constant tone you can actually hear it jump diagonally across from on=
e side
> > > of the stereo field to the other as it enters these rear right & left=
 areas.
> > >
> > > After asking around it has come to my attention that the closer your =
Mid
> > > mic is to a pressure-gradient mic (figure 8 polar pattern), the more =
of a
> > > rear lobe you have, and thus the more chance you have of that rear lo=
be
> > > picking up sound in the opposite channel. This definitely explains ho=
w, and
> > > why, I could be experiencing side swapping.
> > >
> > > Since I've never used an MS setup with a pure cardioid mic I am wonde=
ring
> > > if the same thing happens... For those using a Sennheiser 30/40 MS se=
tup:
> > > does this happen? Do you have side swapping in the 4-5 o'clock and 7-=
8
> > > o'clock positions?
> > >
> > > Nature recording is, for me, one of the areas where a really accurate
> > > stereo image in a 360 degree circle around my recording location is
> > > critical. I am always pointing my mics at the source I am recording, =
but
> > > having sounds behind the mic appearing in opposite channel is just we=
ird.
> > > How do the MS recordists on this forum deal with this?
> > >
> > > Thanks!
> > >
> > > -Justin
> > >
> > >
> > >
> >
> >
> >
> >
>
>












"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.



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