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
|
Miele Vacuum Cleaner S 4212 S 4782 User Manual
NEC Computer Hardware PD75402A User Manual
NEC Washer SAV 4 HD User Manual
Nx Networks Server 2200 User Manual
Oki Network Router BMG7011 User Manual
Olympus Camcorder D200 L User Manual
Omega Engineering Thermometer HH12B User Manual
Omega Vehicle Security Stud Sensor HHP 2000 Series User Manual
Panasonic Car Satellite Radio System CRD 4500 User Manual
Panasonic Printer KX P7100 series User Manual