Neumann.Berlin KM 66 User's Manual
Contents
1. NEUMANN amp gt gt 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 ina 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 frequenci2. es and an uneven response due to changes in distance In the KM 66 the cardio id and figure 8 patterns 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 we Fe eM ea S agg
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