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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: "thxdave" thxdave
Date: Fri Jan 22, 2010 8:29 am ((PST))
Here is the mounting rig that one of our alumni put together:


--- In  "jasonpudd" <> wrote:
> 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 recently 
> and now use the new Invision shock mounts instead of using the older o-ring 
> style shock mounts.  As a result these two mics no longer fit into a Rycote 
> 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 fit 
> into a MZW20-1 zepp using a MZS20-1 shock mount and a MZD30 Dual Clip that 
> stacks the two mics on top of each other inside the zepp.  I am still waiting 
> for a reply.  I will keep you posted with the response I get from Sennheiser.
> If anyone has info concerning this let me know.
> Jason Puddifoot  
> --- In  Dan Dugan <dan@> wrote:
> >
> > >  i am not really sure how exact i should line up the diaphragms. Is there 
> > > 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 
> > possible. Since they're going to be physically separated, they are best 
> > aligned so that the distance is minimized in the horizontal plane, since 
> > stereo directivity is a horizontal thing (think left and right speakers). 
> > So the capsules should be positioned one above the other. That equalizes 
> > the path distance 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 is 
> > 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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