Sennheiser Studio Directional MKH 415 T User Manual download pdf (Page 9)

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of the Sennheiser condenser microphones

with A-B powering is so low (approx. 20 Q)

that an amplifier input with an impedance oI

at least 200 Q will be suitable.

Sennheiser 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-

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.

one itself isprotected from high frequency

~turbance. 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 i.e. when

apressure signal strikes the capsule from

the front, Pin 1 goes positive with reference

to Pin 3. This snould 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 to the input of an amplifier via a

battery adapter or the power supply MZN 5-1.

For larger installations the power supply

MZN 6, which can feed up to six micro-

phon es, can be used. It should be noted

that this 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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