NeumannBerlin Microphone KM 66 User Manual

neumann.berlin  
the microphone company  
KM 66 -The Figure-8 for an Even Sound Field  
Occasionally, by combining elements of existing products,  
previously unknown possibilities are discovered. One ex-  
ample of this in Neumann’s product history is the KM 66,  
a switchable-pattern miniature microphone first produced  
in 1966.  
In developing this micro-  
phone, Neumann com-  
bined two cardioid cap-  
sules from the KM 64 in a  
special way: the dia-  
phragms face away from  
each other with a spacing  
of 10 mm; the backplates  
are separated by an ellip-  
tical divider. The result is  
a capsule combination pro-  
ducing excellent polar pat-  
tern characteristics, even  
in the extreme low-fre-  
quency range. Even at  
40 Hz, the rear-to-front  
differential for each single capsule is 20 dB!  
In an even (diffuse) sound field, no appreciable change in  
on-axis (0 degrees) response occurs when switching from  
omni to cardioid pattern. Also, when the backside capsule  
is added (for omni), there is less than a 10% increase in  
output voltage from the microphone.  
In contrast, polar diagrams  
of typical dual-diaphragm  
microphones indicate that  
the reverse attenuation of  
the cardioid pickup pat-  
tern decreases remarkably  
towards the low frequen-  
cies. When the two cap-  
sule halves are activated at  
the same time, the back-  
side part adds a much  
higher share of the whole  
signal. This generates an  
narrower figure-8 pattern  
in the low frequencies and  
an uneven response due to  
changes in distance.  
feature an accurate representation of low frequencies, even  
in such a case where the microphone is used at a greater  
distance from the sound source. This near-ideal carioid cap-  
sule with its unique attributes is a great asset to other mi-  
crophones utilizing it: the KM 64, U 64, KTM, KM 74 and  
the legendary KM 84.  
In the KM 66, the cardio-  
id and figure-8 patterns  
 

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