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2. Microphone and power supply may be converted to unbalanced
Operation
in
the field
through a minor
alteration.
This Change is
recommebded if the
microphone is to be used exclusively with unbalanced inputs such as
semi-professional
or
home equipment. Fig. 2...5
Switchcraft
A3M
t-
.-
(DIN L152t 1
Standard, balanced
configuration
of Neumann
microphone Outputs.
Fiq* 2
Switchcroft
A3M I DIN L 152t)
1
f-*-
(2)
Fiq. 3
Unbalanced
connections.
1. Wire heretofore
connected to pin 2
(+), remains
connected to pin 2
(now modulation alone).
2. Wire heretofore
connected to pin 3
(-> is to
be
resoldered
to pin 1
without removing the
wire already
connected
there.
3. Remove the Phantom
powering resistors
(2 x 6.8 kohm).
4.
Move the
wire previously
connected to the junction of these
resistors
to pin 3.
The
circuit
then
conforms to IEC 268-12.