Sennheiser MKH 435 T Bedienungsanleitung Seite 9

of the Sennheiser condenser microphones
with A-B powering is small (approx. 20 Q),
which means that it need only be demanded
of the amplifier that its input impedance be
larger than 200 Q.
Senn heiser condenser microphones pro-
duce relatively large output voltages, these
can be up to 1 volt with maximum sound
pressure levels. This has the advantage that
even with long cables induced interference
signals can be disregarded. Also the internal
noise produced by the microphone does not
contribute to the total noise level. The mi-
crophones are fitted with high frequency
filters, which ensure that no high frequency
signals from the microphone can affect the
external circuitry, and also that the micro-
phone itself is protected from~high frequency
disturbance. It is, therefore, not necessary,
even under the most difficult conditions, to
take special precautions such as double
screening of the cables or the provision of
high frequency filters.
Sennheiser condenser microphones are po-
larised according to DIN standard ie. when
apressure signal strikes the capsule from
the front, Pin 1 goes positive with reference
to Pin 3. This should be considered when
the amplifier input plug is being wired.
Connection to amplifiers with symmetrical
inputs
In this case the microphone is simply con-
nected via the battery adapter MZA 6-2, or
the power unit MZN 5-1 to the inputs of the
amplifier. For larger installation the power
supply MZN 6, which can feed up to six mi-
crophones, can be used. In this case it
should be noted that the power supply is
delivered without feed resistors and these
must be added by the user.
Connection to amplifiers with
unsymmetrical inputs
In many cases, for example most tape re-
corders, the input socket is unsymmetrical.
In this case one side of the symmetrical
microphone output has to be earthed. Apart
from cases where the microphone is being
used for professional studio purposes, this
is not critical, as the large output voltage of
the microphone combined with its low out-
put impedance provides a large signal to
noise ratio. Care should be taken, however,
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