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Re: M/S: MKH 50/20 with MKH30 combo > How to line up diaphragms ?

Subject: Re: M/S: MKH 50/20 with MKH30 combo > How to line up diaphragms ?
From: "jasonpudd" jasonpudd
Date: Thu Jan 21, 2010 11:12 am ((PST))
I am at the same point trying to put a MKH 30 and MKH 40 in a zeppelin for =
wind protection right now.  Rycote has changed their mounting system recent=
ly and now use the new Invision shock mounts instead of using the older o-r=
ing style shock mounts.  As a result these two mics no longer fit into a Ry=
cote zeppelin for wind protection according to the local Rycote rep.

I have sent an e-mail to the Sennheiser rep asking if these two mics will f=
it into a MZW20-1 zepp using a MZS20-1 shock mount and a MZD30 Dual Clip th=
at stacks the two mics on top of each other inside the zepp.  I am still wa=
iting for a reply.  I will keep you posted with the response I get from Sen=

If anyone has info concerning this let me know.

Jason Puddifoot

--- In  Dan Dugan <> wrote:
> >  i am not really sure how exact i should line up the diaphragms. Is the=
re some kind of rule i am supposed to follow or is the kind of thing where =
you experiment and learn (rule of thumb).
> The rule is to get the capsules (inside the mic) as close together as pos=
sible. Since they're going to be physically separated, they are best aligne=
d so that the distance is minimized in the horizontal plane, since stereo d=
irectivity is a horizontal thing (think left and right speakers). So the ca=
psules should be positioned one above the other. That equalizes the path di=
stance from sources in the horizontal plane.
> The closer this is to right, the higher in frequency M/S processing (like=
 conversion to left-right) will be accurate. For reference, a 20 KHz wave i=
s about half an inch long, meaning a spacing of 1/2 wave, 1/4" will produce=
 a null when summed. Put the center point of one diaphragm over the center =
point of the other.
> -Dan Dugan

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