Neumann rsm190 mic without matrix box

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Jonkan

Well-known member
Joined
Jun 7, 2004
Messages
733
Location
Sweden
So, a friend of mine has gotten the opportunity to buy a neumann rsm 190 stereo mic for cheap, but it doesnt come with the Matrix box that codes MS or XY and has the PAD and Lowcut. The mic itself is a figure of 8 capsule, and a cardoid capsule on top. Outputs on a 7 pin mic cable to the Matrix box which decodes the signal and sends it to a 5 pin output.

I tried looking into one of these matrix boxes to see if I could perhaps copy it, but neumann has cleverly painted alot of components so that you cannot tell what it is.

Is there any way that we could hook up the mic so that i might be used anyway?

My friend just wants to use it as an MS mic, so im thinking that we could perhaps build some sort of MS encoder box, with attenuation for the Side signal to regulate how wide the signal is.

Or even just connect the mic so that we get the M and S signals separately, and just do all of the encoding afterwards.

Im just wondering if anyone has any ideas where to start. First, any ideas on how i can find out what the 7 pins from the mic do?

Thanks for any suggestions!
/Jonas
 
I managed to get hold of the pinout for the mic:

Neumann 7 pol XLR (from mic)
1 Black GND
2 Red +10V
3 Green -M
4 Yellow -48V
5 Blue +48V
6 White S
7 NC

Looks like unbalanced MS out to me.

Seems that i need to build a +-48v, +10v Psu for it.

Does anybody know any ready made psu pcbs that would be good for this purpose?

Also, the minus (-) infront of pin 3, mid signal...Does that mean it is polarity inversed?

My friend apparently has an inbuilt MS decoder in his mixer, so all i need it seems is to make the box which supplies the power. Would you say it would be good to also balance the output of the unbalanced signals?

Transformer out, or maybe something like the THAT line drivers?

/J
 
I appreciate that this is a rather old thread but did you ever manage to use the rsm190 without matrix box? I’ve got a mic but somehow the mtx box has disappeared..
 
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