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KM 100
Acoustic features
AK 20 is a pressure gradient transducer with
the figure-8 characteristic, realized with a sin-
gle diaphragm. The diaphragm diameter is just
16 mm. All sound field components reach the
diaphragm directly. This results in identical fre-
quency response curves and output levels at
0° and 180° sound incidence. Corresponding
accessories allow combining the AK 20 with
other active capsules or microphones to obtain
an MS-Stereo setup.
AK 30 is a diffuse-field equalized pressure
transducer with a flat frequency response up
to 10kHz (in the diffuse field). In the free
sound field this microphone has a boost of ap-
proximately 7 dB at 10 kHz.
AK 31 is a free-field equalized pressure trans-
ducer with a flat frequency response up to
20 kHz (in the free field). In the diffuse sound
field this microphone has a high frequency roll-
off above 5 kHz.
AK 40 is a pressure gradient transducer with
cardioid characteristic. The frequency curves
are very smooth and match 0° sound incidence.
Sound from sources within a pickup angle of
± 135° is reproduced without any coloration.
AK 43 is a pressure gradient transducer with
wide-angle cardioid characteristic. Attenu-
ation at 90° is 4dB, at 135° it is 8 dB and at
180° it is 11 dB. The frequency response curves
for sound sources within an angle of ± 90° are
parallel up to 12 kHz.
AK 45 is a pressure gradient transducer with
cardioid characteristic, similar to the AK40.
However, it has an acoustic bass roll-off that
is useful during applications when subsonic
and low frequencies may cause difficulties.
The AK 45 is optimized for a flat low frequen-
cy response at a recording distance of 15cm
(“speech cardioid”).
AK 50 is a pressure gradient transducer with
hypercardioid characteristic. Attenuation of
sound incidence from the side or rear is about
10 dB, with minimum sensitivity at an angle of
120°.