Sony MB-806A Mode D'emploi page 11

When using two MB-806A Base Units
When you use two base units, proceed as follows to
ensure that the two tuner units do not use the same
channel settings.
1
Follow the procedure explained above to set the
group and channel of the first base unit.
2
Power on the wireless microphones or transmitters
after adjusting them to the channels of each tuner
unit.
Note
If the microphones or transmitters are not powered
on, the two tuner units may use the same channel
twice.
3
On the first tuner unit of the second base unit, set
the same group as selected on the first base unit.
4
Press the CH button of the first tuner unit on the
second base unit and hold it down for 3 seconds.
Available channels in the same group (channels
not used by the first base unit) are automatically
set on the first tuner unit and the other tuner units
on the second base unit.
Note
If automatic channel setting does not function well for
the second base unit (due to poor reception), set
channels manually for the second base unit.
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