Sennheiser 502431 Datasheet download pdf (Page 9)

Changing the pick-up pattern

There are two different ways of changing the pick-up

pattern of the microphone.

If the microphone level has to be changed infrequently:

왘 At the mixing console, set the preamplification to the

same value in both channels.

왘 Vary the pick-up pattern by using the level control and

the phase switch of the rear channel.

The level control of the front channel stays in the same

position.

If the microphone level has to be changed frequently:

왘 At the mixing console, set the level controls to the same

value and couple them mechanically or electrically.

왘 Change the pick-up pattern by using the pre-set gain

control and the phase switch of the rear channel.

Surround applications

As a result of the symmetry of the microphone, it is also

possible to create any desired rear pick-up pattern. For this

purpose the microphone signals are additionally routed to

two other channels, whereby front and rear channel

exchange roles. The settings are then made in the same

way as described above and the rear pick-up patterns can

be freely selected. Both pick-up patterns are then available

simultaneously, for example for a surround front channel

and a surround rear channel. With two MKH 800 TWIN, four

surround channels can be created in this way.

If only the cardioid pick-up pattern is required for the front

and rear channels, the microphone signals can also be used

directly. This minimises the necessary effort.

With an MKH 800 TWIN and a figure-8 microphone (e.g.

MKH 30) full surround-sound recording using the double

MS technique (MSM) can be done. As is common with the

MS technique, the figure-8 microphone is positioned above

the MKH 800 TWIN and directed to the left. The front and

rear left and right surround channels are produced by

matrixing the figure-8 signal and the front and rear signals

of the MKH 800 TWIN.

By combining the front and rear signals of the

MKH 800 TWIN, a centre channel with any pick-up pattern

can be achieved and even a centre rear channel is possible

if required. In spite of the wide range of options, post-

production still only requires the original microphone

signals to be saved, i.e. only three signals for five or six

surround channels.

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Sennheiser 502431 Datasheet Page 9

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