Sennheiser evolution wireless series EM 100 - Manual (Page 45)

Synchronizing transmitters with receivers
44
If you want to use the frequency bank “ U ”:
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Make sure to use receivers from the same frequency range (see page 5
and the type plates of the devices).
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Only use frequencies that are approved and legal in your country.
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On one of the receivers, select a channel within the frequency bank “ U ”
(see page 39).
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Assign this channel one of the receiving frequencies (see page 39).
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Synchronize a transmitter with the receiver (see page 20).
OR
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Manually set the transmitter to the same channel and frequency that
you set on the receiver.
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Repeat for the remaining transmitters and receivers as described
above.