User manual SENNHEISER MKH 106 P 48

[. . . ] The low capsule impedance of these microphone ensures a reliable, high-quality performance. Connection to amplifiers with unbalanced inputs Should it be necessary to connect phantom powered microphones via a suitable power supply unit to equipment with unbalanced inputs then it is normal practice to use a transformer. [. . . ] The two audio frequency wires also carry the positive supply voltage and the return circuit for the supply current is formed by the cable screening. at Senn heiser , the connection of both condenser and dynamic microphones is based on the principle of voltage matching. The main advantage is that neither the impedance variations of the microphone output nor those of the amplifier input have any noticeable effect on the overall frequency response. The source impedance of Senn heiser condenser microphones with phantom powering is so low (around 10 Ohm at 1000 Hz) that the amplifier input need have a minimum impedance of only 200 Ohm. If the microphone is working with sound pressure levels in excess of 30 Pa (124 dB) then the input impedance should be at least 1 kahm. Sennheiser condenser microphones produ'ce relatively large output voltages (exceeding 1 volt at 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 microphones are fitted with RF filters which ensure that no high frequency signals from the microphone can effect the external circuitry and that the microphone itself is protected from high frequency disturbance from outside. It is therefore not necessary, even under the most difficult conditions, to take special precautions such as double screening of the cables 01'the provision of high frequency filters. Sennheiser condenser microphones are polarized according to DIN standard i. When apressure pulse strikes the capsule from the front, Pin 1 of the DIN-connector (resp. Pin 2 of the Cannonconnector) goes positive with reference to Pin 3. [. . . ] Microphones are attached by pushing their Tuchel connectors into the plastic clamp. Power supply unit for 48 V phantom powering according to DIN 45596. [. . . ]