Sennheiser System 2013 PLL - Manual (Page 25)

Frequency selection
D
2.7
Setting channels on transmitter and receiver
The transmission frequencies are set with the rotary switch (D) on the transmitter and
receiver. The assignment of a switch position to a frequency is listed on the back of the
unit on the information plate. Depending on the model, up to 16 frequencies are available.
This allows multi-channel operation, e.g. in schools.
Important information:
• The transmitter and receiver of one transmission unit must be
set to the same frequency!
• One transmitter can be used with several receivers set to the same frequency.
• One receiver cannot be used with several transmitters set to one frequency! This
type of incorrect setting can be noticed from crackling and chirping noises at the receiver.