in 1953, the AKG D12 was the world's first dynamic cardioid mic
with a "unidirectional" design intended to reduce the
pick up of extraneous sound and the production of feedback. It
was based on new developments in microphone technology at the
time which eliminated much of the shrillness characteristic in
earlier microphones and extended the frequency response deeper
into the bass range. It's a large diaphragm, dynamic, cardioid
pattern mic and the transducer has a special "bass chamber"
that boosts the lower frequencies in the 60-120 Hz range giving
it a full, round bass end whilst the slight peak in the 60 to
120 Hz range enables the microphone to do full justice to a range
of brass instruments and vocals and the mic was an immediate success
at radio stations, recording studios, and movie sets throughout
A number of other AKG microphones would be based on the D12, including
the D20B, D25, D30, D36, and the D45.