User manual SENNHEISER MKH 415 T

[. . . ] The low capsule impedance leads to a very small self-induced noise signal from the microphone and to a high performance reliability. Powering and Connection Sennheiser electronic introduced A-B powering, which was then standardised in DIN 45595. Only two wires are required to connect the microphone when this powering system is being used. [. . . ] 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. 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 ~~nal to nOlse ratio. 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. Phone so that it "sees" at least 200 Q. 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. the voltage should be 12 volts :t 2 volt. [. . . ] 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. The power supply for the KAT 25 and the mierophone is also taken from the line socket, A switchable roll-oft-filter is ineluded in both channe/s. 0479) The roll-olf-filter MZF 15 should be included only between supply voltage souree and amplifier input. [. . . ]