User manual SENNHEISER MKH 415 T

[. . . ] Only two wires are required to connect the microphone when this powering system is being used. The operating current is fed along the same wires as the audio frequency signal, so that the circuitry in the microphone does not have to be connected to earth. [. . . ] Connection to Amplifiers with Unsymmetrical Inputs In many cases, for example most tape recorders, 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 output impedance provides a large signal to noise ratio. Care should be taken, however, 9 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. When it is normally intended 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. The 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. However, if the input impedance is smaller than 200 Q, a resistor of appropriate value should be placed in series with the micro. Tho voltage division caused by this se des resistor 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 Facilities to Amplifiers with Powering If an appropriate voltage source is available in the amplifier the condenser microphone can be powered direct. It should be so stabilised and filtered, that the unweighted noise voltage is less than 5 flV and that the weighted noise components are less than 2 ~lVolts. [. . . ] The unit may be fitted into the microphone cable at any convenient place. Only one microphone can be used with the MZN 5-1 if the inputs are unbalanced or it is necessary to make the inputs ungrounded by using isolating transformers. [. . . ]