User manual SENNHEISER MKH 406 T-U

[. . . ] High frequency circuit The capsule 01a RF condenser microphone presents, contrary to low Irequency circiuts, a low impedance output. Instead 01 the high polarisation voltage normally required, a high Irequency capsule needs only a high Irequency voltage 01 about 10 volts, which is produced by a built-in low-noise-oscillator (8 MHz). the low capsule impedance leads to a high perlormance reliability 01 the microphones. [. . . ] Connection to amplifiers with unbalanced inputs In many cases, lor example most tape recorders, the input socket is unbalanced. in this case one side 01 the balanced microphone output has to be earthed. Apart lrom cases where the microphone is being used lor prolessional studio purposes, this is not critical, as the large output voltage 01 the microphone combined with its low output impedance provides a large signal to noise ratio. Care should be taken, however, that when the microphones are mounted on tripods, etc. Connection to amplifiers with high input sensitivity II the amplilier being used has a very high input sensitivity, i. When it is normally intended lor use with dynamic microphones, it can be necessary to reduce the output voltage lrom the microphone by means 01 a voltage divider. This should be built into the microphone cable at the amplilier input. By this means the large signal on the microphone cable is maintained up to just belore the amplilier, which helps to increase the signal to noise ratio. Connection to amplifiers with defined input impedances Sennheiser studio condenser microphones can be connected direct to all ampliliers whose input impedance is larger than 60011. Should, however, the input impedan ce be smaller than 600 11, a resistor 01 appropriate value should be placed in series with the microphone so that it "sees" at least 600 11. The voltage division caused by this se ries resistor must 01 course be considered. The same method can be used when a higher output impedance 01 the microphone is demanded. In this case again, aseries resistor can be used to provide correct matching. Connection to amplifiers with powering facilities II an appropriate voltage source is available in the amplilier the condenser microphone can be powered direct. [. . . ] The KA 7-U is fitted on one end with a Cannon female connector, and on the other end with a Cannon plug (XLR-3-12 C). Battery adapter MZA 15 Can be connected into the microphone line at any point. Special feature: If the plug and connector are connected together the battery condition is indicated by a built-in LED. [. . . ]