Sennheiser Studio Directional MKH 415 T User Manual download pdf (Page 11)

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that no multiple ground circuits are formed

when the microphones are mounted on

tripods etc.

Connection to Amplifiers with High Input

Sensitivity

If the amplifier being used has a very high

input sensitivity, i. e. when it is normally in-

tended for use with dynamic microphones,

it can be necessary to reduce the output

voltage from the microphone by means of

a voltage divider. This should be built into

the microphone cable at the amplifier input.

By this means the large signal on the micro..

phone cable is maintained up to just before

I"e amplifie!', whi~h helps to increase the

~~nal to nOlse ratio.

Connection to Amplifiers with Defined Input

Impedances

Sennheiser studio condenser microphones

can be connected direct to all amplifiers

whose input impedance is larger than 200 Q,

This is usual in the majority of cases. How-

ever, if the input impedance is smaller

than 200 Q, a resistor of appropriate value

should be placed in series with the micro..

phone so that it "sees" at least 200 Q. Tho

voltage division caused by this se des re-

sistor must of course be considered.

The same method can be used when a

higher output impedance of the microphono

is demanded. In this case again asories

resistor can be used to provide correct

matching.

Connection to Amplifiers with Powering

Facilities

If an appropriate voltage source is available

in the amplifier the condenser microphone

can be powered direct. The voltage should

be 12 volts :t 2 volt. It should be so stabi-

lised and filtered, that the unweighted noise

voltage is less than 5 flV and that the

weighted noise components are less than

2 ~lVolts. The current consumption of the

microphone is approximately 5 to 6 mA.

According to the DIN standard the feed

resistors should be 2 x 180 Q :t 1 %. This

means that approx. 2 volts are lost across

the resistors.

The circuit of the MKH 415 is so dimen-

sioned that a supply voltage tolerance of

12 volts :t 2 volts is permitted.

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