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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: "Max" oatcruncher
Date: Fri Jan 22, 2010 9:08 am ((PST))
Hi Dave,
Sorry to muddy the waters on this discussion, but I have just been talking to 
the service department at Sennheiser UK. I was very surprised to discover that 
the capsule on the MKH-60 is close the tip of the mic, and NOT as I had 
previously thought further down the tube. I was so surprised at this that I 
pressed the point to be absolutely certain I was understanding him correctly. 
This means of course that the picture on the link you give for the 60/30 shows 
an incorrect configuration.

--- In  "thxdave" <> wrote:
> Dan, can you help me with this....where is the capsule on my MKH60 shotgun? I 
> have it in an M/S rig with my MKH30 and the capsule on the '30 is easy to see 
> but not so the '60.
> dave
> --- 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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